Answer:
When a substance burns, it produces new substances during a chemical change. Therefore, whether or not a substance is flammable is a chemical property. Knowing which substances are flammable helps you to use them safely. Another chemical property is how compounds react to light
A wheel initially rotating at 12 rad/s decelerates uniformly to rest in 0.4 s. If the wheel has a rotational inertia of 0.5 kg.m², what is the magnitude of the torque causing this deceleration? (A) 1.5 N.m (B) 15 N.m (C) 30 Nm (D) 38 Nm
Answer:
(B) 15 N.m
Explanation:
The deceleration of the wheel is first found by using the following formula:
[tex]\alpha = \frac{\omega_f - \omega_i}{t}[/tex]
where,
α = angular acceleration = ?
ωf = final angular speed = 0 rad/s
ωi = initial angular speed = 12 rad/s
t = time = 0.4 s
Therefore,
[tex]\alpha = \frac{0\ rad/s - 12\ rad/s}{0.4\ s}\\\\\alpha = -30\ rad/s^2[/tex]
here, the negative sign shows deceleration.
Now, we find the torque responsible for this deceleration:
[tex]\tau = I\alpha[/tex]
where,
τ = torque = ?
I = rotational inertia = 0.5 kg.m²
Therefore,
[tex]\tau = (0.5\ kg.m^2)(30\ rad/s^2)\\[/tex]
τ = 15 N.m
Therefore, the correct answer is:
(B) 15 N.m
A wheelbarrow is pushed with a force of 40 N. If 6,000 J of work is
done, what is the total distance the wheelbarrow was pushed?
Answer:
Distance = 150 meters
Explanation:
Given the following data;
Work done = 6,000 Joules
Force = 40 Newton
To find the total distance covered by the wheelbarrow;
Workdone = force * distance
Substituting into the formula, we have;
6000 = 40 * distance
Distance = 6000/40
Distance = 150 meters
Therefore, the total distance the wheelbarrow was pushed is 150 meters.
why don't you have to make your heart beat?
Answer:
Some muscles in the body are “involuntary”, which means you can't control them. The heart is made of a special involuntary muscle called cardiac muscle, and this muscle is made up of cells called cardiomyocytes (which literally means “heart muscle cells” in Latin)
Are the number of atoms before and after a chemical reaction the same? Why?
Answer:
They rearrange themselves and join together differently to make new substances called products. The number of atoms of each type is the same before and after a reaction. This means that the total mass of the products is the same as the total mass of the starting substances. In other words, mass is conserved.
A string 1.30 meters in length is oscillating in its first harmonic. The frequency of
oscillation is 7.80 Hz. What is the wavelength of the first harmonic?
Answer:
2.6m
Explanation:
The formula for calculating the wavelength is expressed as;
λ = v/f
v is the velocity
f is the frequency of vibration
Given
f = 7.80Hz
We need to get the velocity
For string;
f = V/2L
7.80 = V/2(1.3)
7.80 = V/2.6
V = 2.6 * 7.8
V = 20.28m/s
Get the required wavelength
λ = v/f
λ = 20.28/7.80
λ = 2.6m
Hence the wavelength of the first harmonic is 2.6m
Jupiter's gravity is about 2.3 times stronger than Earth's gravity. Calculate the
mass and weight of a scientific instrument if it were on the surface of Jupiter,
given its mass and weight on Earth's surface.
On Earth's Surface
On Jupiter's Surface
Mass
54 ks
A.
B.
Weight
529 N
What is A
What is B
Answer:
Explanation:
There is no change in mass. Therefore, mass = 70 k g
Weight on Jupiter ≈ 1578 N
[tex]\huge\mathfrak\red{Question}[\tex]
When two magnets repel, they
A. break
B. pull together
C. push apart
D. change color
Answer:
option C : they push apart
Explanation:
If you hold two magnets the wrong way around, they push apart - they repel! In other words, if you hold two magnets together so that like-poles are close together (two norths OR two souths), they repel
Answer:
the magnet push apart
Explanation:
that is the two magnet are facing each other with the same pole...
that is to say like pole push apart and unlike pole attract
A +0.0129 C charge feels a 4110 N
force from a -0.00707 C charge. How
far apart are they?
[?] m
Answer:
r = 14.13 m
Explanation:
Given that,
Charge 1 = +0.0129 C
Charge 2 = -0.00707 C
The force between charges, F = 4110 N
We need to find the distance between charges. Let the distance be r. The force between two charges is given by :
[tex]F=\dfrac{kq_1q_2}{r^2}\\\\4110=\dfrac{9\times 10^9\times 0.0129\times 0.00707}{r^2}\\\\r=\sqrt{\dfrac{9\times 10^9\times 0.0129\times 0.00707}{4110}} \\\\r=14.13\ m[/tex]
So, the distance between charges is equal to 14.13 m.
Answer:
14.13 m
Explanation:
acellus
Miles Tugo and Ben Travlun are riding in a bus at highway speed on a nice summer day when an unlucky bug splatters onto the windshield. Miles and Ben begin discussing the physics of the situation. Miles suggests that the momentum change of the bug is much greater than that of the bus. After all, argues Miles, there was no noticeable change in the speed of the bus compared to the obvious change in the speed of the bug. Ben disagrees entirely, arguing that that both bug and bus encounter the same force, momentum change, and impulse. Who do you agree with
Answer:
Ben os ok. the moment of the bus and the worm are conserved
Explanation:
System formed by the bus and the worm, therefore the forces during the collision are internal and therefore the moment is conserved
initial instant. Airs of shock
p₀ = My v₀
final instant. After the shock
p_f = (M + m) v
the moment is preserved
p₀ = p_f
M v₀o = (M + m) v
v = [tex]\frac{ M}{ M+m}[/tex] v₀
v = [tex]\frac{1}{1 +\frac{m}{M} }[/tex] v₀
Let's analyze these equations the moment of the bus and the worm are conserved, therefore Ben is the one who is right. Let us propose the solution of the problem.
The person that I agree with based on their stance about the physics of the situation is; Ben Travlun
Conservation of MomentumI will agree with Ben Travlun. The reason is that;
From the question, we see that the bug and the bus experience the same force, the same impulse, and the same momentum change.
Now, the concept of sameness above is not portrayed by Miles' statement because miles claims that the momentum change of the bug is much greater than the bus.
Now, though the bug has less mass and therefore more acceleration, the occupants of the very big bus will not feel the unusually small acceleration.
Finally, the bug is composed of a less strong material and as a result it will be scattered all over the windshield. However, this high level of the bug being scattered and the greater acceleration it possesses does not translate to greater force, impulse, or momentum change.
Read more about conservation of momentum at; https://brainly.com/question/7538238
PLS i really need help.
•you decided to play Flick the coin with your friend. The goal of the game is to flick the coin from the top of a table and let it land of the floor as far as possible. The coin that you flicked left the table (0.8m high) with an initial velocity of 5m/s. Compute the following.
A. Time It will take for the coin to reach the ground.
B. Range (how far from the base of the table will the coin land.with solution
Answer:
A) The time taken by the coin to reach the ground will be 0.4 seconds
B) Range of the motion of the coin will be 2m
Explanation:
This is a case of horizontal projectile motion as there's no initial vertical velocity given to the coin and has only horizontal velocity initially.
According to the equations of Horizontal projectile
[tex]Sy=\frac{1}{2} *g*t^2[/tex] {[tex]Sy =[/tex] Vertical distance traveled , [tex]g=[/tex] acceleration due to gravity of Earth , [tex]t=[/tex] time of flight i.e time taken)[tex]Sx= Vx*t[/tex] ([tex]Sx=[/tex] Range of the projectile ,[tex]Vx=[/tex] initial horizontal velocity, [tex]t=[/tex] time of flight)Given :
Vertical distance to be traveled ([tex]Sy[/tex])= 0.8m
Initial horizontal velocity ([tex]Vx[/tex])= 5m/s
For calculations, we will take acceleration due to gravity ([tex]g[/tex]) to be [tex]10 m/s^2[/tex]
A) Putting values in equation [tex]Sy=\frac{1}{2} *g*t^2[/tex]
⇒ [tex]0.8=\frac{1}{2} *10*t^2[/tex]
⇒[tex]\frac{1.6}{10} =t^2[/tex]
⇒ [tex]\sqrt{0.16} =t[/tex]
⇒ [tex]0.4=t[/tex]
Therefore, time taken by the coin to reach the ground is 0.4 seconds
B) Now using t= 0.4s putting values in equation [tex]Sx= Vx*t[/tex]
⇒[tex]Sx=5*0.4[/tex]
⇒[tex]Sx=2[/tex]
Hence , Range of the coin is 2m
Learn more about Projectile motion here :
https://brainly.com/question/24216590
#SPJ2
explain newton's second law of motion
Answer: Newtons second law of motion: the acceleration of an object is directly related to the net force and inversely related to its mass. ... So, the force/mass ratio (from the equation acceleration = force/mass) is the same for each. Therefore, the acceleration is the same and they reach the ground at the same time.
Explanation:
Hope this helps you! Have a good day!
Answer:
Newton's second law states that the acceleration of an object is directly related to the net force and inversely related to its mass. ... So, the force/mass ratio (from the equation acceleration = force/mass) is the same for each. Therefore, the acceleration is the same and they reach the ground at the same time.
Example:Newton's Second Law of Motion says that acceleration (gaining speed) happens when a force acts on a mass (object). Riding your bicycle is a good example of this law of motion at work. Your bicycle is the mass. Your leg muscles pushing pushing on the pedals of your bicycle is the force.
Explanation:
~Hope this helps
the distance and direction between starting and ending positions
Answer:
The length traveled by an object moving in any direction or even changing direction is called distance. The location of an object in a frame of reference is called position. For straight line motion, positions can be shown using a number line. The separation between original and final position is called displacement
Explanation:
good luck
How can we create a new element by combining all the other elements
Answer:
In order to create a new element you have to change the number of protons in a nucleus.
The increase in resistant strains of insects to chemicals is a result of:
A. natural selection creating new organisms
B. evolution of new species
C. increase in those offspring who inherited resistant traits from their parents
D. all of the above
Answer:
answer D. all of the above
a water bomber flying with a horizontal speed of 85m/s at a height of 3000m drops a load on a fire below. How far in front of the target fire should the load be released?
Answer:
2081.65 m
Explanation:
We'll begin by calculating the time taken for the load to get to the target. This can be obtained as follow:
Height (h) = 3000 m
Acceleration due to gravity (g) = 10 m/s²
Time (t) =?
h = ½gt²
3000 = ½ × 10 × t²
3000 = 5 × t²
Divide both side by 5
t² = 3000 / 5
t² = 600
Take the square root of both side
t = √600
t = 24.49 s
Finally, we shall determine the distance from the target at which the load should be released. This can be obtained as follow:
Horizontal velocity (u) = 85 m/s
Time (t) = 24.49 s
Horizontal distance (s) =?
s = ut
s = 85 × 24.49
s = 2081.65 m
Thus, the load should be released from 2081.65 m.
17. Which element has 57 neutrons?
Answer:
where are the answers
Explanation:
- 3000 J of work is done on a 2kg object over a distance of 10m. What is the force acting on the object?
A.1500N
B.300N
C.3000N
D.600ON
What is the output voltage?
Answer:
120 volts
Explanation:
The output voltage is the voltage released by a device, such as a voltage regulator or a generator. Voltage regulators maintain constant voltage levels. A conductor carries the output voltage to various destinations, such as homes and businesses.
Una mujer de masa m está parada en el borde de una mesa giratoria horizontal de momento de inercia I y radio R. La mesa al principio está en reposo y tiene libertad de moverse alrededor de un eje vertical sin fricción que pasa por su centro. La mujer empieza a caminar alrededor de la orilla en direción de las manecillas del reloj (vista desde arriba) a una velocidad constante v en relación a la Tierra.
a) En qué dirección y con qué velocidad angular gira la mesa?
b) Cuál es el trabajo efectuado por la mujer para poner en movimiento la mesa?
r
[tex]- \frac{mR^2 }{I } \ v[/tex]Answer:
a) w = - [tex]\frac{m r }{I} v[/tex] , b) W = - ½ m_woman R² (1 + m_woman R / I²) v²
Explanation:
a) To solve this exercise, let's use the conservation of angular momentum.
We define a system formed by the table and the woman, therefore the torques are internal and the moment is conserved
initial instant. Before starting to move the woman
L₀ = 0
final instant. After starting to move
L_f = I w + m v r
the moment is preserved
L₀ = L_f
0 = Iw + m v r
w = - [tex]\frac{m r }{I} v[/tex] (1)
the direction of the angular velocity is opposite to the direction of the linear velocity, that is, counterclockwise
b) for this part we use the relationship between work and kinetic energy
W = ΔK
in this case the initial speed is zero and the final speed of the table, using the relationship between linear and angular variables
v = w r
we substitute
W = 0 - ½ I_total w²
I_total = I + m_{woman} R²
W = - ½ (I + m_woman R²) ( [tex]\frac{m_{woman} R}{I} \ v[/tex]) ²
W = - ½ (m_woman² R² + m_woman³ R³ / I²) v²
W = - ½ m_woman R² (1 + m_woman R / I²) v²
How many moles are there in 321g of silver hydroxide?
Answer:
2.5705594546378 mol
Explanation:
Used this calculator
http://www.endmemo.com/chem/mmass.php
The process of blood cell formation is known as ?
ita called hematopoiesis
Two point sources are simultaneously creating waves with a wavelength of 6 cm. Point X lies between the two sources. It is 9 cm from one source and 15 cm from the other. What wave heights do you expect at point X? A. The waves will never get very high or low. B. The waves may get very high, but will never get very low. C. The waves may get very low, but will never get very high. D. The waves will sometimes get very high and very low.
Answer:
OPTION D (The waves will sometimes get very high and very low) is the answer.
Explanation:
Wavelength = velocity ÷ frequency
As the frequency which measures the number of waves per unit of time is inversely proportional to the wavelength, point X which lies between two sources, and one source is shorter than another, the wave heights at point x will vary as the distances from point X vary too. This means that waves at point X depending on the wave type and source will get very high at times and very low.
What are 3 procedures of having(making) spinners? Help!
Answer:
The bearings are generally ceramic, metal (stainless steel or chrome), and some are hybrids—such as ceramic balls with stainless races and cages.
Explanation:
good luck
pls helppp :)List several examples of applied force, normal force, and friction that you’ve observed in your life.
ill mark brainliest if the answer is actually helpful:p
Answer:
an example for applied force is
Explanation:
The applied force is the force applied to the object to either displace it or change its shape.
HOPE THIS HELPS
HELP ME ASAP PLZZZ NOW!!!
Answer:
B. It's nucleus releases energy
Explanation:
If the ___ of a material are lined up, the object will be magnetic.
Answer please
will mark brainliest if right
Answer:
Atoms
Explanation:
Which region of a longitudinal wave is this?
A. Rarefaction
B. Diffusion
C. Compression
D. Diffraction
The region of a longitudinal wave that is represented by an arrow is known as rarefaction. Thus, the correct option for this question is A.
What is a Longitudinal wave?A longitudinal wave may be defined as a type of wave where the displacement of the medium is in the same direction as the direction of the traveling wave. The distance between the centers of two consecutive regions of compression or the rarefaction is defined by wavelength, λ.
Longitudinal waves express areas of compression and rarefaction: compressions are regions of high pressure due to particles being close together. Rarefactions are regions of low pressure due to particles being spread further apart.
Therefore, the region of a longitudinal wave that is represented by an arrow is known as rarefaction. Thus, the correct option for this question is A.
To learn more about Longitudinal waves, refer to the link:
https://brainly.com/question/14364881
#SPJ2
Which of the following is true of alternating current? Select all that apply.
- The net position of the electrons remains the same.
- Electrons always flow in one direction.
- Electrons reverse direction periodically.
- It waveform is the sine wave.
Answer:
The correct option is (C).
Explanation:
Electric current can be direct or alternating.
The direct current flows only in one direction. It is unidirectional.
The alternating current or an C current reverse its direction periodically.
So, the correct statement regarding the alternating current is (c) i.e. Electrons reverse direction periodically.
The table below includes data for a ball rolling down a hill. Fill in the missing data values in the table and determine the acceleration of the rolling ball. Also find the final Acceleration. Please make sure to fill out the table. Thank you sm!
Please help lol I'm not ver good at these ones
Answer:
Following are the responses to the given question:
Explanation:
Please find the attached table.
[tex]\to t= 10\ /sec\\\\ \to v = 15\ m /sec\\\\ \to a= ?\\\\\to a=\frac{v}{t}\\\\[/tex]
[tex]=\frac{15}{10}\\\\=1.5[/tex]
The more dense the liquid, the higher the __________ at a particular depth.
Answer:
The higher the pressure
