The mass of water that was heated in the calorimetry experiment was 547.73 g.
T is the temperature change (7.16 K). Rearranging the formula to find the mass (m):
m = Q / (cΔT) Plugging in the values:
m = 17000.0 J / (4.18 J/g·K × 7.16 K) m ≈ 657.71 g
So, approximately 657.71 grams of water was heated in the calorimetry experiment.
To calculate the mass of water that was heated, we need to use the formula:
Q = m × c × ΔT
where Q is the heat transferred, m is the mass of water, c is the specific heat capacity of water, and ΔT is the temperature change.
We are given that Q = 17000.0 J, ΔT = 7.16 K, and c = 4.18 J/(g·K) (the specific heat capacity of water). We can rearrange the formula to solve for m:
m = Q / (c × ΔT)
Substituting the values we have:
m = 17000.0 J / (4.18 J/(g·K) × 7.16 K)
m = 547.73 g
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Your firm has been hired to design a system that allows airplane pilots to make instrument landings in rain or fog. You've decided to place two radio transmitters 50 m apart on either side of the runway. These two transmitters will broadcast the same frequency, but 180 degrees out of phase with each other. This will cause a nodal line to extend straight off the end of the runway. As long as the airplane's receiver is silent, the pilot knows she's directly in line with the runway. If she drifts to one side or the other, the radio will pick up a signal and sound a warning beep. To have sufficient accuracy, the first intensity maxima need to be 58 m on either side of the nodal line at a distance of 5. 0 km
The frequency (f) using the speed of light (c ≈ 3 x 10^8 m/s): 4.67 x 10^8 Hz for the transmitters.
To design a system that allows airplane pilots to make instrument landings in rain or fog using two radio transmitters 44 m apart on either side of the runway, you need to determine the frequency for the transmitters. To have sufficient accuracy, the first intensity maxima should be 70 m on either side of the nodal line at a distance of 4.8 km.
We can use the formula for constructive interference to find the frequency:
sin(θ) = mλ / d
Here, θ is the angle between the nodal line and the location of the first intensity maxima, m is the order of the maxima (m=1 for the first maxima), λ is the wavelength, and d is the distance between the transmitters (44 m).
First, find the angle θ using the tangent function:
tan(θ) = 70 m / 4.8 km = 70 m / 4800 m
θ = arctan(70/4800) ≈ 0.0146 radians
Now, use the sin(θ) formula with m=1 and d=44 m:
sin(0.0146) = 1 * λ / 44 m
λ ≈ 0.0146 * 44 m ≈ 0.6424 m
Now that we have the wavelength, we can find the frequency (f) using the speed of light (c ≈ 3 x 10^8 m/s):
f = c / λ
f ≈ (3 x 10^8 m/s) / 0.6424 m ≈ 4.67 x 10^8 Hz
You should specify a frequency of approximately 4.67 x 10^8 Hz for the transmitters.
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Complete question:
Your firm has been hired to design a system that allows airplane pilots to make instrument landings in rain or fog. You've decided to place two radio transmitters 44 {\rm m} apart on either side of the runway. These two transmitters will broadcast the same frequency, but out of phase with each other. This will cause a nodal line to extend straight off the end of the runway (see Figure 21.30b). As long as the airplane's receiver is silent, the pilot knows she's directly in line with the runway. If she drifts to one side or the other, the radio will pick up a signal and sound a warning beep. To have sufficient accuracy, the first intensity maxima need to be 70 {\rm m} on either side of the nodal line at a distance of 4.8 {\rm km}.
What frequency should you specify for the transmitters?
2. A bull of mass 250 kg is moving at a momentum of 750 kg m/s. Find its velocity.
Answer:
3m/s
Explanation:
momentum = mass×velocity
750kg m/s = 250kg × velocity
750kg m/s /250kg = velocity
3 m/s = velocity
Momentum = Mass × velocity
Velocity = Momentum/mass
Velocity = 750/250
Velocity = 3 m/s
Hope Helpful ~
If i drop a ball 15 meters off the ground what will be the velocity right before it hits the ground
The velocity of the ball right before it hits the ground is approximately 17.15 m/s.
Assuming that there is no air resistance, the velocity of the ball right before it hits the ground can be calculated using the equation v² = u² + 2as, where v is the final velocity, u is the initial velocity (which is 0 m/s in this case), a is the acceleration due to gravity (which is approximately 9.8 m/s²), and s is the distance the ball falls (which is 15 meters in this case). Plugging these values into the equation, we get:
v² = 0² + 2(9.8)(15)
v² = 294
v ≈ 17.15 m/s
the velocity of the ball right before it hits the ground is approximately 17.15 m/s.
Therefore, the velocity of the ball right before it hits the ground is approximately 17.15 m/s.
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Compare the electric force experienced by an electron in the hydrogen atom to the gravitational force experienced by the electron
The electric force experienced by an electron in the hydrogen atom is significantly stronger than the gravitational force experienced by the electron.
The electric force is responsible for holding the electron in orbit around the nucleus, while the gravitational force between the two is negligible. This is due to the fact that the electric force is much stronger than the gravitational force, by a factor of approximately 10^36.
This means that the electric force is the dominant force acting on the electron in the hydrogen atom, and determines its behavior within the atom. The strength of the electric force is determined by the charges of the particles involved, while the strength of the gravitational force is determined by their masses. Since the electron is much lighter than the nucleus, the gravitational force between the two is negligible in comparison to the electric force.
In summary, the electric force experienced by an electron in the hydrogen atom is much stronger than the gravitational force experienced by the electron, and is the dominant force responsible for the electron's behavior within the atom.
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"an object with a mass of 0.20 kg has an acceleration of 5.0 m/s^2 when an unbalanced force of 1.0 n is applied to it" can be explained by newton's second law.
F = (0.20 kg) x (5.0 [tex]m/s^{2}[/tex]) = 1.0 N, which is the same as the applied unbalanced force.
Newton's second law of motion states that the acceleration of an object is directly proportional to the net force acting on it and inversely proportional to its mass.
The given situation describes an object with a mass of 0.20 kg experiencing an acceleration of 5.0 [tex]m/s^{2}[/tex] when an unbalanced force of 1.0 N is applied to it.
The net force acting on the object can be calculated using the equation F = ma, where F is the net force, m is the mass, and a is the acceleration.
Therefore, F = (0.20 kg) x (5.0 [tex]m/s^{2}[/tex]) = 1.0 N, which is the same as the applied unbalanced force.
This illustrates that the acceleration of the object is directly proportional to the force applied to it, in accordance with Newton's second law of motion.
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What type of fit would describe the following situations. a. the cap of a ball-point pen b. the lead in a mechanical lead pencil, at the tip c. the bullet in a barrel of a gun
a. The fit between the cap and a ball-point pen can be described as a "snug" or "friction" fit, as the cap is designed to stay securely in place when not in use.
b. The fit of the lead in a mechanical pencil at the tip can be described as a "precision" fit, as the lead needs to be held firmly and accurately within the pencil to allow for smooth and consistent writing.
c. The fit of a bullet in the barrel of a gun can be described as a "tight" or "interference" fit, as the bullet must be in close contact with the barrel to ensure accurate firing and prevent gas leakage during discharge.
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A silver atom at rest has a mass of about 1. 8×10−25kg. What is the rest energy of a silver atom?
The rest energy of a silver atom can be calculated using Einstein's famous equation, E=[tex]mc^{2}[/tex], where E is the energy, m is the mass and c is the speed of light.
Rest energy of a silver atom (E) = mass of silver atom (m) x speed of light [tex](c)^{2}[/tex]
= 1.8 x [tex]10^{-25}[/tex] kg x (3 x [tex]10^{8}[/tex] [tex]m/s)^{2}[/tex]
= 1.62 x [tex]10^{8}[/tex] J
This means that even when the silver atom is at rest, it has an enormous amount of energy stored in its mass due to its mass-energy equivalence.
This concept is important in understanding nuclear reactions, where a small amount of mass is converted into energy through the process of nuclear fission or fusion.
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A 2. 99 x 10-6 C charge is moving
perpendicular (90°) to the Earth's
magnetic field (5. 00 x 10-5 T). If the
force on it is 2. 14 x 10-8 N, how fast is
it moving?
the charge is moving at a speed of 1.43 x 10^3 m/s.
To solve this problem, we can use the equation for the magnetic force on a moving charge:
F = qvB
where F is the force, q is the charge, v is the velocity, and B is the magnetic field.
Rearranging the equation to solve for velocity, we get:
v = F / (qB)
Plugging in the given values, we get:
v = (2.14 x 10^-8 N) / [(2.99 x 10^-6 C) x (5.00 x 10^-5 T)]
Simplifying, we get:
v = 1.43 x 10^3 m/s
Therefore, the charge is moving at a speed of 1.43 x 10^3 m/s.
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How does the ISS maintain equilibrium when there are unbalanced forces?
The ISS maintains equilibrium using thrusters, gyroscopes, and aerodynamically stable components.
The International Space Station (ISS) maintains equilibrium in spite of unbalanced forces through the use of thrusters and gyroscopes. The thrusters can be fired in short bursts to adjust the station's position, while gyroscopes help to maintain its orientation in space.
The station's position and orientation are constantly monitored by ground control, which can send commands to adjust the thrusters and gyroscopes as needed to make equilibrium.
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Does this equation show that transmutation has taken place? Why or why
not?
He - He+y
A. No, because gamma rays are emitted.
B. Yes, because the numbers of atoms and nucleons are conserved.
o
C. Yes, because it involves radioactive decay.
D. No, because the numbers of atoms and nucleons are conserved.
The correct answer is C. Yes because it involves radioactive decay.
The given equation shows a transmutation reaction where a helium nucleus (He) collides with a target nucleus (yA) to form a new nucleus (y+2A) and a gamma ray is emitted. The emission of gamma rays is a characteristic of radioactive decay, which occurs during the process of transmutation.
In transmutation reactions, the number of atoms and nucleons may or may not be conserved, so options B and D are incorrect. The emission of gamma rays signifies that the new nucleus is in an excited state and is emitting energy to reach a more stable state. This is a clear indication of radioactive decay and hence option A is also incorrect.
To summarize, the given equation involves transmutation as a result of a collision between two nuclei, and the emission of gamma rays indicates radioactive decay, thereby leading to the conclusion that transmutation has taken place.
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Calculate the angular momentum of a 265 kg motorcycle traveling at 25 m/s. Traveling around a circular curve 500 m in radius
The angular momentum of a 265 kg motorcycle traveling at 25 m/s around a circular curve with a radius of 500 m is [tex]3,312,500 \;kg.m^2/s.[/tex]
To calculate the angular momentum of the motorcycle, we need to first find its angular velocity. Since the motorcycle is traveling around a circular curve, we can use the formula:
[tex]v = r\omega[/tex]
where v is the velocity of the motorcycle, r is the radius of the curve, and ω is the angular velocity.
Rearranging this formula to solve for ω, we get:
[tex]\omega = v/r[/tex]
Substituting the values given, we get:
[tex]\omega = 25 \;m/s \;/ \;500 m = 0.05 \;rad/s[/tex]
Next, we can use the formula for angular momentum:
[tex]L = I\omega[/tex]
where L is the angular momentum, I is the moment of inertia, and ω is the angular velocity.
For a point mass moving in a circular path, the moment of inertia is simply mr², where m is the mass of the motorcycle and r is the radius of the curve.
Substituting the values given, we get:
[tex]L = (265 \;kg)(500 \;m)^2(0.05 \;rad/s)[/tex]
[tex]L = 3,312,500 \;kg.m^2/s[/tex]
Therefore, the angular momentum of the motorcycle is [tex]3,312,500 \;kg.m^2/s.[/tex]
In summary, the angular momentum of a 265 kg motorcycle traveling at 25 m/s around a circular curve with a radius of 500 m is [tex]3,312,500 \;kg.m^2/s.[/tex]
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Consider the two-slit experiment. Light strikes two slits that are a distance 0. 0236 mm apart. The path to the third-order bright fringe on the screen forms an angle of 2. 09° with the horizontal. What is the wavelength of the light?
The wavelength of the light in the two-slit experiment is approximately 9.51×[tex]10^{-7}[/tex] meters or 951 nm.
To find the wavelength of the light, we can use the formula for double-slit interference:
dsin(θ) = mλ
where d is the distance between the slits (0.0236 mm),
θ is the angle to the bright fringe (2.09°),
m is the order of the fringe (third-order, so m = 3),
and λ is the wavelength of the light.
Now, we can solve for λ:
1. Convert the angle to radians:
θ = 2.09°×π÷180 = 0.0365 radians
2. Convert the distance between the slits to meters:
d = [tex]0.0236 mm(\frac{1m}{1000mm})[/tex] = 2.36×[tex]10^{-5}[/tex] m
3. Rearrange the formula to solve for λ:
λ = (dsin(θ))÷m
= [tex]\frac{2.36(10^{-5})m(sin0.0365)}{3}[/tex] =[tex]9.51[/tex]×[tex]10^{-7}[/tex] meters
= 951 nm
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as you get older it, it will become harder to eat whatever you want and maintain a healthy weight. this is because your basel metabolic rate, or BMR, ______ as your age.
This is because your basal metabolic rate, or BMR, decreases as you age.
What is BMR ?
Your body burns calories at rest to maintain essential bodily processes like breathing, circulation and cell growth and repair which is referred to as BMR.
Age-related changes in body composition including an increase in body fat and a loss of muscular mass can result in a reduction in BMR.
Therefore, To maintain a healthy weight and overall health as you age, it is crucial to pay attention to your food and physical activity levels. Maintaining a healthy BMR and avoiding weight gain can be achieved by eating a well-balanced diet with sensible portion sizes and exercising frequently.
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A car of mass , initially at rest, begins to move with constant acceleration until it reaches, after a time interval , a speed 0. Then, it moves with uniform motion at speed 0 for another time interval. The total distance travelled by the car is a) 0 b) 3 2 0 c) 3 8 0 2 + 0 d) 2 /2 e) 0 2 4
The total distance travelled by the car is 0.
The correct answer is (a).
Let the acceleration of the car be a and the time interval during which it accelerates be t1. During this time, the car travels a distance d1 given by:
[tex]d1 = (1/2)at1^2[/tex]
When the car reaches a speed of 0, it continues to move with uniform motion for another time interval t2. The distance travelled during this time is given by:
d2 = 0t2 = 0
The total distance travelled by the car is therefore:
[tex]d = d1 + d2 = (1/2)at1^2[/tex]
We need to eliminate the unknown time t1 in order to express the total distance travelled in terms of the acceleration a. We can do this by using the fact that the final speed of the car is 0:
v = at1 = 0
Therefore, the time interval t1 is:
t1 = 0
Substituting this into the expression for d, we get:
[tex]d = (1/2)at1^2 = 0[/tex]
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A ball tied to a string of length 0.507 m makes 2.2 revolutions every second. Calculate the speed of the ball. Your answer must be within ± 2.0%
The speed of the ball can be calculated using the formula:
v = 2πr/T
where v is the speed of the ball, r is the length of the string, and T is the period of rotation (time taken for one revolution).
In this case, the length of the string is given as 0.507 m and the ball makes 2.2 revolutions every second. Therefore, the period of rotation (T) can be calculated as:
T = 1/f = 1/(2.2 rev/s) = 0.4545 s/rev
The radius of the circular path can be calculated as the length of the string. Therefore,
r = 0.507 m
Substituting these values in the formula, we get:
v = 2πr/T = 2π(0.507 m)/(0.4545 s/rev) = 7.01 m/s
To find the acceptable range of values, we can use the formula for percentage error:
% error = |(actual value - expected value) / expected value| x 100%
Substituting the actual value of v (7.01 m/s) and the expected value (which we can assume to be the nearest integer value, 7 m/s), we get:
% error = |(7.01 m/s - 7 m/s) / 7 m/s| x 100% = 0.14%
Therefore, the answer for the speed of the ball is 7.01 m/s, and it is within ±2.0% of the expected value.
What ethical concepts inform your personal code of ethics? How has it changed, if at all, from Unit 1? Explain.
Ethical concepts like fairness and respect can shape a person's personal code of ethics. Fairness means treating others equally and without bias, while respect involves acknowledging and appreciating the value of every individual.
Responsibility involves being accountable for one's actions and taking steps to avoid causing harm to others, and integrity involves acting in accordance with one's values and being honest and transparent.
An individual's personal code of ethics can change over time based on experiences, education, and personal growth. Unit 1 may have introduced new ethical concepts or challenged previously held beliefs, leading to a shift in one's personal code of ethics.
Additionally, changes in personal circumstances or exposure to new environments and cultures can also shape one's ethical framework. It is important for individuals to regularly reflect on and evaluate their personal code of ethics, as it serves as a guide for decision-making and behavior in both personal and professional settings.
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i need help with this pls!<333 would be so appreciated
The magnitude of the combined speed is 326.15 km/hr and the direction is 2.62 degrees.
The magnitude and directionTo find the magnitude and direction of the combined speed, we can use vector addition. Let's represent the velocity of the plane as vector A, and the velocity of the wind as vector B. The magnitude of vector A is 300 km/hr, and the angle between vector A and vector B is 60 degrees.
To find the x and y components of vector B, we can use trigonometry. The angle between vector B and the x-axis is 30 degrees (90 - 60), so we have:
cos(30) = adjacent/hypotenuse
adjacent = cos(30) * 30 km/hr
adjacent = 25.98 km/hr
sin(30) = opposite/hypotenuse
opposite = sin(30) * 30 km/hr
opposite = 15 km/hr
So, vector B has an x-component of 25.98 km/hr and a y-component of 15 km/hr.
Now we can add vectors A and B by adding their x and y components separately. Let's call the resulting vector C:
Cx = Ax + Bx = 300 km/hr + 25.98 km/hr = 325.98 km/hr
Cy = Ay + By = 0 km/hr + 15 km/hr = 15 km/hr
The magnitude of vector C is given by the Pythagorean theorem:
|C| = sqrt(Cx^2 + Cy^2) = sqrt((325.98 km/hr)^2 + (15 km/hr)^2) = 326.15 km/hr
The direction of vector C can be found by taking the inverse tangent of Cy/Cx:
theta = tan^-1(Cy/Cx) = tan^-1(15 km/hr / 325.98 km/hr) = 2.62 degrees
So the magnitude of the combined speed is 326.15 km/hr and the direction is 2.62 degrees.
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Which landform will occur in a subduction zone where oceanic plates collide?.
When oceanic plates collide in a subduction zone, one plate is forced beneath the other, which results in the formation of a variety of landforms.
One of the most common landforms that can occur in a subduction zone is a volcanic arc. This is formed when magma rises from the subducting plate and forms a chain of volcanic islands or mountains on the overriding plate.
Examples of volcanic arcs include the Andes in South America and the Cascade Range in the western United States.
Another type of landform that can occur in a subduction zone is a deep ocean trench. This is formed when the subducting plate plunges deep beneath the overriding plate and creates a narrow, steep-sided depression in the ocean floor.
Examples of deep ocean trenches include the Mariana Trench in the Pacific Ocean and the Peru-Chile Trench in the southeastern Pacific Ocean.
In addition to volcanic arcs and deep ocean trenches, subduction zones can also create uplifted regions known as accretionary wedges.
These are formed when sediments and other materials accumulate on the overriding plate as a result of the subduction process. Over time, these materials become compacted and uplifted to form a thick, wedge-shaped mass of rock.
Overall, the specific type of landform that forms in a subduction zone where oceanic plates collide will depend on a variety of factors, including the angle of the subduction zone, the composition of the plates involved, and the amount of time that has passed since the collision began.
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One average force f1 has a magnitude that is three times as large as that of another force f2. both forces produce the same impulse. the average force f1 acts for a time interval of 1.90 ms. for what time interval does the average force f2 act
The time interval for the average force f2 to act is one-third of the time interval of f1, or approximately 0.63 ms.
Since both forces produce the same impulse, we know that: f1 x t1 = f2 x t2, where f1 is three times as large as f2, and t1 is given as 1.90 ms. We can then rearrange this equation to solve for t2:
t2 = (f1 / f2) x t1
t2 = (3 x f2 / f2) x t1
t2 = 3t1
Therefore, the time interval for the average force f2 to act is one-third of the time interval of f1, or approximately 0.63 ms.
This means that even though the magnitude of f1 is three times larger than that of f2, f2 must act for three times as long as f1 to produce the same impulse.
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Part A Under what condition is the angular momentum of an object conserved? O If there are no torques acting on it. O If there is no net torque acting on it. If it is a point particle. If there is no net force acting on it. Submit Request Answer Part B On what does the angular momentum of an object depend? Select all that apply. O The axis of rotation. The shape of the object. O The mass of the object. O The rate at which that the object rotates. Submit Request Answer
Part A: The angular momentum of an object is conserved if there is no net torque acting on it.
Part B: The angular momentum of an object depends on the following factors:
a. The axis of rotation: The choice of axis around which the object rotates affects its angular momentum.
b. The shape of the object: The distribution of mass within the object and its shape impact its angular momentum.
c. The mass of the object: Objects with larger masses tend to have greater angular momentum.
d. The rate at which the object rotates: The angular velocity, which represents the rate at which the object rotates, affects its angular momentum. Higher angular velocities result in higher angular momentum.
Therefore, the factors that affect the angular momentum of an object are:
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At point a is the interference between the two sources constructive or destructive?.
At point A, the interference between the two sources is constructive. This is because the two waves are in phase at this point, meaning the peaks and troughs of the two waves line up.
When this happens, the amplitude of the combined wave is greater than the amplitude of either individual wave. This increased amplitude results in a stronger wave, which is an example of constructive interference.
Constructive interference can also be caused when two waves have a phase difference of 0, 180, or multiples of 180. In this case, the two waves have a phase difference of 0, resulting in constructive interference.
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Two large speakers broadcast the sound of a band tuning up before an
outdoor concert. While the band plays an A whose wavelength is 0. 773 m,
Brenda walks to the refreshment stand along a line parallel to the speakers. If
the speakers are separated by 12. 0 m and Brenda is 24. 0 m away, how far
must she walk between the "loudspots"?
Two large speakers broadcast the sound of a band tuning up before an outdoor concert.While the band plays an A whose wavelength is 0. 773 m, Brenda walks to the refreshment stand along a line parallel to the speakers. If the speakers are separated by 12. 0 m and Brenda is 24. 0 m away then 0.387 meters must she walk between the "loudspots".
Since the wavelength of the sound wave is known, we can use the concept of interference to find the distance between the "loudspots". At the point of maximum constructive interference, the waves from both speakers will add up, creating a louder sound. At the point of maximum destructive interference, the waves will cancel each other out, creating a quieter sound.
Let d be the distance that Brenda needs to walk to reach the point of maximum constructive interference between the two speakers. At this point, the waves from both speakers will add up to create a louder sound. The path difference between the waves from the two speakers at this point will be exactly one wavelength.
Using the Pythagorean theorem, we can find the distance between Brenda and each of the speakers:
Distance from Brenda to speaker 1 = [tex]\sqrt{24^{2} +6^{2} }[/tex] = 24.6 m
Distance from Brenda to speaker 2 = [tex]\sqrt{24^{2}+18^{2} }[/tex]= 30 m
The path difference between the waves from the two speakers at the point of maximum constructive interference will be:
Path difference = distance from Brenda to speaker 2 - distance from Brenda to speaker 1
Path difference = 30 m - 24.6 m = 5.4 m
Since the path difference is exactly one wavelength, we have
Wavelength = path difference = 0.773 m
Therefore, the distance that Brenda needs to walk to reach the point of maximum constructive interference is
d = wavelength/2 = 0.773 m/2 = 0.387 m
So Brenda needs to walk 0.387 meters between the "loudspots".
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Particles 91, 92, and q3 are in a straight line.
Particles q1 = -1. 60 x 10-19 C, q2 = +1. 60 x 10-19 C,
and q3 = -1. 60 x 10-19 C. Particles q1 and q2 are
separated by 0. 001 m. Particles q2 and q3 are
separated by 0. 001 m. What is the net force on q2?
Remember: Negative forces (-F) will point Left
Positive forces (+F) will point Right
-1. 60 x 10-19 C
+1. 60 x 10-19 C
-1. 60 x 10-19 C
91
+ 92
93
0. 001 m
0. 001 m
According to the question the net force on q₂ is zero.
What is forces ?Force is an interaction between two objects which causes one object to change its state of motion. It can be described as a push or a pull on an object, and is measured in units of Newtons (N). Forces can be caused by a variety of things, including gravity, friction, magnetism, and electrical charges. Forces can cause objects to accelerate, decelerate, or remain in constant motion. Examples of forces include a person pushing a box, a car’s engine pushing it forward, and a magnet attracting a piece of metal.
The net force on q₂ is zero because of the symmetry of the particles. The two negative charges are the same distance away from q₂, which creates equal and opposite forces, canceling each other out.
Similarly, the two positive charges are also the same distance away, creating equal and opposite forces that also cancel each other out. Therefore, the net force on q₂ is zero.
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Five seconds into her run, Selina sees a rabbit and decides to chase it. She accelerates at a rate of 0. 1m/s2. What would be her pace at 10s? Show your work
Her pace at 10 seconds is 1 m/s. We can solve this problem by using the equations of motion for constant acceleration.
First, we need to find Selina's velocity at 10 seconds. We can do this by using the equation: v = u + at, where v is the final velocity, u is the initial velocity (which is zero in this case), a is the acceleration, and t is the time.
Plugging in the values, we get: v = 0 + (0.1 m/s^2) x (10 s), v = 1 m/s
So Selina's velocity at 10 seconds is 1 m/s.
Next, we can find her pace (or speed) by dividing the distance she has traveled by the time taken.
Since we don't know the distance she has traveled, we'll assume that she has covered the same distance as she would have if she had maintained a constant speed of 1 m/s for the entire 10 seconds.
So the distance traveled, d, is: d = v x t, d = (1 m/s) x (10 s), d = 10 m
Therefore, Selina's pace at 10 seconds is: pace = distance / time, pace = 10 m / 10 s, pace = 1 m/s. So her pace at 10 seconds is 1 m/s.
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A man is pulling a 20 kg cart up a hill that is 5 m high if he used 50 N force how far did he pull the cart for
The distance he pulled the cart for is 5 meters, as that is the height of the hill.
The work done by the man to pull the cart up the hill is given by the formula W = F dcos(theta), where W is the work done, F is the force applied, d is the distance traveled, and theta is the angle between the force and the direction of motion.
Since the force and the direction of motion are in the same direction, theta = 0. Therefore, W = F * d.
Substituting the given values, we get W = 50 N * 5 m = 250 J. This is the amount of work done by the man. The distance he pulled the cart for is 5 meters, as that is the height of the hill.
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A 500g trolley is placed on a runway that is tilted so that it makes an angle of 30° to a horizontal table
2.4N is the magnitude of the tension T in the string
Define tension force.
It is also possible to refer to tension as the action-reaction pair of forces acting at each end of the aforementioned elements. Tension is defined as the pulling force transmitted axially by a string, rope, chain, or other similar object, or by each end of a rod, truss member, or other comparable three-dimensional object.
When an object is compressed or stretched, spring forces come into play. The degree of compression or stretching has a direct relationship to the force a spring produces. In other words, the force a spring produces increases with the amount it is compressed or stretched.
T=Mgsin30−Ff +mg
T=(0.5)(9.8)sin30−1.5+(0.15)(9.8)
T=2.4 N
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Complete question:
A 500g trolly is placed on a runway that is tilted so that it makes an angle of 30 degrees to a horizontal table.A light inextensible string is attached to 150g mass piece.the trolly accelerates down the slope as a result of the force applied by the hanging mass piece.the frictional force between the trolly and the runway is 1.5N, what is the magnitude of the tension T in the string?
Identify one water parameter that could be measured to determine whether raw sewage is present in surface waterways.
The presence of raw sewage in surface waterways can be determined by measuring biochemical oxygen demand (BOD). This is a measure of the amount of oxygen used by microbes in decomposing organic matter.
In water contaminated with raw sewage, there is an abundance of organic matter that is broken down by bacteria, resulting in high levels of BOD. High BOD levels indicate an increased amount of organic matter in the water, indicating the presence of raw sewage. In addition, when BOD levels are high, the oxygen levels in the water decrease, which can be detrimental to fish and other aquatic organisms.
Therefore, measuring BOD is an effective way to determine if raw sewage is present in surface waterways.
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How do human activities contribute to the EXTREME effects of Habagat and Amihan?
Human activities such as deforestation, urbanization, improper waste disposal, climate change, and inadequate infrastructure contribute to the extreme effects of Habagat and Amihan by: increasing the risk of flooding and landslides during monsoon seasons.
Both monsoons bring significant amounts of rainfall and can cause flooding and landslides in affected areas.
Firstly, deforestation reduces the ability of forests to absorb excess rainwater and maintain soil stability, increasing the risk of landslides and flash floods during heavy rainfall. Additionally, urbanization replaces permeable surfaces with impermeable ones, reducing the land's capacity to absorb water and increasing the likelihood of flooding in urban areas.
Secondly, improper waste disposal, particularly in rivers and other waterways, exacerbates flooding by obstructing the flow of water and reducing the efficiency of drainage systems. This can lead to more severe flooding during monsoon seasons.
Thirdly, climate change, partly driven by human activities like burning fossil fuels and industrial processes, is causing an increase in global temperatures. This results in more intense and unpredictable weather patterns, including extreme rainfall events during the Habagat and Amihan monsoons.
Lastly, inadequate infrastructure, such as poorly designed drainage systems and insufficient flood control measures, can make areas more vulnerable to the extreme effects of monsoons. Human activities that contribute to these inadequacies include insufficient planning, budget allocation, and implementation of effective measures to mitigate the impacts of extreme weather events.
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You are sprinting toward an ice cream truck that is parked up the street at a stop sign. The tantalizing melody you hear
a. Is slightly lower pitched than it sounds to the driver of the truck
b. Is slightly higher pitched than it sounds to the driver of the truck
c. Is slightly lower in speed than it sounds to the driver of the truck
d. Is slightly higher in speed than it sounds to the driver of the truck
e. Is the same as it sounds to the driver of the truck
The correct answer is b.
The sound of the ice cream truck's melody will be slightly higher pitched to someone who is sprinting towards it compared to the driver of the truck.
This phenomenon is known as the Doppler effect. When you are moving towards a sound source, such as the ice cream truck, the sound waves are compressed as they approach you. This compression increases the frequency of the sound waves, resulting in a higher pitch.
In simpler terms, as you move towards the truck, you are "catching up" to the sound waves it emits. This causes the frequency of the sound waves to appear higher to you, making the melody sound slightly higher pitched compared to what the driver of the truck hears.
It is important to note that this effect is relative to the motion of the observer. If you were moving away from the ice cream truck, the sound would appear lower pitched due to the sound waves being stretched out as they move away from you.
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A humpback whale dove beneath the ocean's surface, and 310 seconds later it sang to
another whale that was 1,800 meters away. The song's sound wave traveled at a constant
velocity of 1,500 meters per second toward the other whale. How much time did it take the
sound wave to travel from one whale to the other?
The sound wave took 1.2 seconds to travel from one whale to the other.
Velocity is a physical quantity that describes the rate of change of an object's position with respect to time and includes both the speed and direction of motion. It is a vector quantity, meaning it has both magnitude and direction and is typically measured in meters per second (m/s) or other appropriate units.
The time it took for the sound wave to travel from one whale to the other can be calculated using the formula:
time = distance/velocity
In this case, the distance between the whales is 1,800 meters and the velocity of sound in water is 1,500 meters per second. Therefore:
time = 1,800 meters / 1,500 meters per second
time = 1.2 seconds
Hence, The distance between the two whales was covered by the sound wave in 1.2 seconds.
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