A car traveling 23 m/s begins to decelerate at a constant rate of 5 m/s2. After how many seconds does the car come to a stop
The time elapsed when the car comes to complete stop is 4.6 s.
The given parameters;
initial velocity of the car, [tex]v_0[/tex] = 23 m/sacceleration of the car, a = - 5 m/s²The time elapsed when the car comes to complete stop is calculated as follows;
[tex]v_f = v_0 + at[/tex]
where;
[tex]v_f[/tex] is the final velocity of the car when it comes to a complete stop
[tex]0 = 23 + (-5)t\\\\0 = 23 - 5t\\\\5t = 23\\\\t = \frac{23}{5} \\\\t = 4.6 \ s[/tex]
Thus, the time elapsed when the car comes to complete stop is 4.6 s.
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who discovered earth was like a big magnet
Help me please I will give you a crown!!!!
Answer:
D. First F, then D, then C
What are the properties of object located at infinites
Answer:
As the parallel rays coming from the object converge at the principal focus, F of a concave mirror; after reflection through it. Therefore, when the object is at infinity the image will form at F. Properties of the image formed: Point-sized image, highly diminished in size.
At Infinity: At focus (F)
Position of object: Position of image
Between F and C: Beyond C
Beyond C: Between F and C
Explanation:
This is because when the object is at infinity, the incident rays are parallel to the principal axis. Hence the image is formed at the focus. And the image is real and inverted but in diminished size.
What characteristics do black holes have?
Two spheres each have a mass of 2.0 x 10 kg. How far apart must they be to exert a
gravitational force of 50 N between them?
a).016 m b) 231 m c) 53,000 m
d) 110,000 m
e) 6.7 x 10" m
Hi there!
We can use the Gravitational Force equation:
[tex]F_g = \frac{Gm_1m_2}{r^2}[/tex]
Fg = Gravitational force (N)
m₁, m₂ = mass of spheres (kg)
r² = distance between the spheres
G = Gravitational Constant
We are given the force of gravity, so we can rearrange the equation to solve for r:
[tex]r^2F_g = Gm_1m_2\\\\r = \sqrt{\frac{Gm_1m_2}{F_g}}[/tex]
Plug in the given values:
[tex]r = \sqrt{\frac{(6.67*10^{-11})(2.0*10^9)(2.0*10^9)}{50}} = \boxed{231 m}[/tex]
Therefore, the correct answer is B) 231 m.
Question 1 (2.5 points)
Which of the following safety guidelines is NOT important to this lab experiment?
Use wet paper towels or a fire extinguisher to put out small fires.
Ensure that you have a clean working space to minimize errors.
Wear goggles when there are flying objects near your face.
Read instructions before beginning the lab so you know what you are doing.
Question 2 (2.5 points)
As the number of washers goes up, what happens to the mass and the centripetal force on the apparatus?
mass goes up, centripetal force goes down
mass goes up, centripetal force goes up
mass goes down, centripetal force goes down
mass goes down, centripetal force goes up
Question 3 (2.5 points)
What is the independent variable in this experiment?
number of washers
radius (length of string)
time for 20 revolutions
velocity
Question 4 (2.5 points)
What is the dependent variable in this experiment?
number of washers
radius (length of string)
time for 20 revolutions
velocity
Question 5 (2.5 points)
Why is it important to keep the length of the string the same?
Because it can affect the velocity by affecting the circumference.
To make the experiment easier.
Because that is the only length it will work properly at.
Because that is the only length it will work properly at.
Question 6 (2.5 points)
As the number of washers goes up, what happens to the circumference?
The circumference increases.
The circumference decreases.
The circumference stays the same.
What's a circumference?
Question 7 (2.5 points)
As the number of washers goes up, what happens to the time for 20 rotations?
The time increases.
The time decreases.
The time stays the same.
Question 8 (2.5 points)
As the number of washers goes up, what happens to the velocity?
The velocity increases.
The velocity decreases.
The velocity stays the same.
Question 9 (2.5 points)
Which of these is the best defintion for PERIOD in this experiment?
The time for one wave.
The time for one class.
The time for one revolution.
The dot at the end of a sentence.
Question 10 (2.5 points)
Why do we measure the time for 20 revolutions instead of the time for one revolution?
To get more accurate results.
Because human reaction time is too slow to reliably measure one revolution.
To reduce human errors in the results.
All the other answers are correct.
Answer:
I took the test on K12 and got an A
1. A
2. B
3. A
4. C
5. A
6. C
7. B
8. A
9. C
10.C
Earth travels around the Sun in an elliptical orbit. Because of its elliptical orbit, Earth is not the same distance from the Sun at all times. When Earth is closer to the Sun, the amount of solar power that arrives at Earth's surface is greater. Total solar irradiance, also referred to as solar intensity, is defined as the total solar power received by a unit surface area and is measured in units of watts per square meter. The Sun's power output is 3.86 x 1026 W. The distance from Earth to the Sun is 0.9813 au when Earth is the closest, at perihelion, and 1.0160 au when Earth is the farthest, at aphelion. Calculate the average total solar irradiance Itop at the top of Earth's atmosphere. Express your answer to 4 significant figures. Itop = W/m²
The intensity of the radiation from the Sun reduces as the distance from the Sun increases.
The solar irradiance at the top of Earth's atmosphere is approximately 1,376.22 W/m².Reasons:
The solar flux density is given by the formula;
[tex]\displaystyle S_d = \frac{L}{ \left(4 \cdot \pi \cdot d^2 \right)}[/tex]
L = 3.86 × 10²⁶ W
The average distance from the Earth to the Sun is found as follows;
[tex]d_{ave } = \displaystyle \frac{0.9813 \ au + 1.0160 \ au}{2} = 0.99865 \ au[/tex]
1 au = 1.496 × 10⁸ km
0.99865 au = 0.99865 × 1.496 × 10⁸ km = 149,398,040 km
[tex]\displaystyle S_d = \frac{3.86 \times 10^{26}}{ \left(4 \times \pi \times (1.49398040 \times 10^{11})^2 \right)} \approx 1,376.22[/tex]
The solar flux density reaching Earth, [tex]S_d[/tex] = The average total solar irradiance
[tex]I_{top}[/tex] at the top of Earth's atmosphere ≈ 1,376.22 W/m².
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A raindrop strikes the ground with a speed of 8.5 m/s. The specific heat of water is 4.19 x 103 J/(kg•°C).
What is the raindrop’s change in temperature after it strikes the ground, in degrees Celsius, assuming all its initial kinetic energy goes into heating it?
Answer:
0.00862 °C
Explanation:
When all Kinetic energy goes Into heating we can write
Q= mc × change in temperature
Q = 1/2 mv^2
1/ 2 mv^2 = mc × change in temperature
cancel out m because its in both sides
1/2 v^2 = c × change in temperature
1/ 2 × 8.5 ×8.5 = 4190 × x
x = 0.00862 °C
The energy an object has as a result of motion is known as kinetic energy.A force must be applied to an object in order to accelerate it.We must put in effort in order to apply a force.After the work is finished, energy is transferred to the item, which then moves at a new, constant speed.
How is kinetic energy determined?
Kinetic energy has the following formula: K.E. = 1/2 m v2, where m is the object's mass and v is its square velocity.The kinetic energy is measured in kilograms-meters squared per second squared if the mass is measured in kilograms and the velocity is measured in meters per second. A particle or an item that is in motion has a sort of energy called kinetic energy.An item accumulates kinetic energy when work, which involves the transfer of energy, is done on it by exerting a net force. When all Kinetic energy goes Into heating we can writeLet's consider a few instances where we see kinetic energy in daily life while keeping this formula in mind.Hydropower Plants, Windmills, Moving Cars, Gunshots, Flying Airplanes, Walking and Running, Cycling, and Rollercoasters are just a few examples.Q= mc × change in temperature
Q = 1/2 mv^2
1/ 2 mv^2 = mc × change in temperature
cancel out m because its in both sides
1/2 v^2 = c × change in temperature
1/ 2 × 8.5 ×8.5 = 4190 × x
x =0.00862 °C
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#SPJ2
If the acceleration vector of an object is directed parallel to the velocity vector, then Select one:
O a. the object is moving with a constant velocity.
O b. the object is turning.
O c. the object is at rest.
O d. the object is slowing down
O e. the object is speeding up.
Answer:
a. The object is moving with a constant velocity.
a 225 kg crate is pushed horizontally with a force of 710n
Answer:
acceleration is 3.155
Explanation:
F = ma
710 = 225 a
a = 710/225
a = 3.155
name a suitable thermometer for steady temperature of 1000 degree Celsius?
Answer: A platinum resistance thermometer
Explanation:
It is a versatile instrument for temperature measurement in the range from — 200° to 1000°C. It is used both for precision measurements of the highest accuracy and for routine industrial work.
Answer:
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The vertical displacement of the wave is measured from the what? And what is the term for vertical displacement?
Explanation:
The vertical displacement of the wave is measured from the
equilibrium to the crest and is called the frequency.
crest to the trough and is called the amplitude.
trough to the trough and is called the wavelength.
equilibrium to the crest and is called the amplitude.
HØPÊ ĮŤ ÌŠ helpful
mark mE aS bRillAnT ♠The total momentum of a system of two moving identical bodies is zero. What should be true about the velocities of the bodies?
A) The velocities should be equal in direction and opposite in magnitude.
B) Both velocities should be zero
C) Both velocities should be equal in magnitude and opposite in direction
D) the velocities should be equal in magnitude and opposite in direction
For a zero total momentum of two bodies, the two velocities of the two bodies should be equal in magnitude and opposite in direction
According to the principle of conservation of linear momentum, the total momentum of an isolated system is constant.
[tex]Pi = P_f \\\\m_1u_1 + m_2u_2 = m_1v_1 + m_2 v_2[/tex]
where;
u is the initial velocity of the two bodiesv is the final velocity of the two bodiesm is the mass of the two bodiesWhen the total momentum is zero, the velocities of the two bodies will have equal values but opposite signs.
Thus, we can conclude that for a zero total momentum of the two bodies, the two velocities should be equal in magnitude and opposite in direction
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if a 50.0 kg mass weighs 554 n on the planet saturn, calculate saturn's radius
Answer:
this is impossible unless im doing my math wrong sorry
Explanation:
What are three kinds of forces that affect an object’s motion? What effects do these forces have?
one-celled organism
Many-celled organism
the food making process
Answer:
Different forces (including magnetism, gravity, and friction) can affect motion
How do I start this question?
Answer:
Typing in the keyboard the question that you have
Explanation:
Which of the following atoms contain a nucleus with no neutrons.
helium
hydrogen
deuterium
tritium
Answer:
Hydrogen
Explanation:
(H) atom does not have any neutrons in it's tiny nucleus.
Answer: C. Hydrogen
Explanation: Now I can answer the question lol, that bot didn't let me.
A 15.0kg box slides down an incline 5.00 m high and 9.00 m long. It starts at rest at the top and moves at the speed 2.50m/s when it is at the bottom.
How much work is done by friction? [688J].
What is the energy transformation efficiency? [94%]
Answer:
Explanation:
Potential energy at the top
PE = mgh = 15.0(9.81)(5.00) = 735.75 J
Kinetic energy at the bottom
KE = ½mv² = ½(15.0)(2.50)² = 46.875 J
Work done by friction is the difference
735.75 - 46.875 = 688.875 ≈ 689 J
HMMMMMmmmm Energy transformation efficiency is 100% because energy can be neither created nor destroyed. With the given answer, I'm guessing they want to know what percentage of the potential energy got converted to heat of friction
688.875 / 735.75 = 0.936289... ≈ 94%
Your own car has a mass of 1200 kg. If your car produces a force of 6000 N, how fast will it accelerate?
Using sound waves signals allow oceanography to determine ocean depth
Answer:
echosounding
Explanation:
The time taken for the sound to travel through the ocean and back is then used to calculate water depths. The faster the sound waves return, the smaller the water depths and the higher the elevation of the seafloor.
A plane travels a distance of 3,650 kilometers in 5.50 hours. What is the average speed of the plane
Answer: 625.71km/h
Explanation: Divide the numbers.
Please help me to solve this problem
A pulley system has an efficiency of 87.5 percent.
How much of the rope must be pulled in if a force of
648 N is needed to lift a 150 kg desk 2.46 m?
(Disregard friction.)
Answer:
work done on desk = m g h = 105 * 9.81 * 2.46 = 2534 Joules
Explanation:
so work in = 2534 / 0.875 = 2896 Joules
that is your 648 times distance your hand moved holding the rope
2896 = 648 * x
4.47 meters
I think maybe a typo, 648 N is too big, maybe 64.8 ? Any block and tackle system does better than that.
4. If an object had a mass of 216 g on Earth what would its mass be on the Moon?
Answer: Weight changes with surface gravity.So in Moon mass will be same as 26 gram mes.
Explanation:
Do you believe that Freud’s theory was applicable only to the era in which he lived, or do you believe it can still be applied today?
Answer:
Freud's importance to psychology and psychiatry remains in the foundational aspects of the science of human behavior and the mind. Outside of Freudian psychoanalysis, Freud is no longer applicable or important to practical applications of psychological theory.
Hello, I wanted an answer from a mathematician. The number 1.04 is closer to the number 1, 2, 1.25 or 1.5.
Answer:
1
Explanation:
line them up in order.
1, 1.04, 1.25, 1.5, 2
1.04 is in the middle of 1 and 1.25
1.04-1=0.04
1.25-1.04= 0.21
Answer:
1
Explanation:
1.04 lies between 1 and 1.25.
1.04 is 0.21 away from 1.25
1.04 is 0.04 away from 1.
0.04<0.21
PLS HELP!!!!
by pushing the crate up the ramp rather than lifting it to the platform, you are using ________ force, but moving the crate a ____________ distance
A) more; less
B) more; greater
C) less; greater
D) the same amount; greater
Answer:
a
Explanation:
rwggwh4
The pressure of a constant volume gas thermometer is 2100N/M squared at 38c. What will be the temperature of the gas when the pressure is increased by 1/3?
Answer:
Explanation:
In
how do anatomical similarities and differences between various organisms ( living and fossils) help infer lines of Evolutionary descent
Answer:
Explanation:
Based on the generalization that "form follows function".
If two creatures have the same or similar anatomical structures used to complete a task such as eating, moving, hearing, smelling, reproduction, etc. the likelihood they are genetically related is high.
If two creatures have differing means or structures used for completing a task, the likelihood of them NOT being closely related is high.
