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2 years ago

What are the forces that act on the ball pushed on the floor?Plss answer

Physics

1 answer:

vaieri [72.5K]2 years ago

4 0

Explanation:

The ball, for example, will feel gravity pulling it downward and the ground pushing it upward in the direction it is rolling. (Add this if the ball is rolling on the floor.) Friction is the force that causes the ball to slow down because it acts in the opposite direction that it is moving.

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Letting D D represent the maximum displacement, the extremes of the block's motion are at position A, where x = − D x=−D, and at

Ksju [112]

Answer:

The answer is at x = 0, which represents position B

Explanation:

The full question is:

"A block is attached to a horizontal spring and set in a

simple harmonic motion, as shown from above in the figure. When the spring is relaxed, the block is a position B, where the displacement x from the equilibrium position is 0. Letting D represent the maximum displacement, the extremes of the block's motion are at position A, where x= -D, and at position C, where x= D.

At what point in the motion is the speed of the block at its maximum?"

And you can see the figure on the attached file.

Simple Harmonic motion equations

We can start from the equation that describes the position that is

$x(t)=D \sin\left(\omega t)$

Here D stands for the amplitude which is the maximum displacement, and $\omega$ is the angular velocity, thus we can find the derivative to find the velocity equation, so we get

$v(t)=D \omega \cos (\omega t)$

And we can find the derivative again to find the acceleration.

$a(t) = -D\omega^2 \sin (\omega t)$

Maximum speed

We reach the maximum speed when the acceleration equation is equal to 0,

$a(t) =0\\-D\omega^2 \sin (\omega t)=0$

Thus it happens when

$\sin (\omega t)=0$

So if we replace that on the position equation we get

$x(t)=D \sin(\omega t) \\x(t)=D(0)\\x(t)=0$

Thus the position where the speed of the block is at at its maximum is when it is going back to the origin, that is x = 0, so point b.

7 0

3 years ago

Redshift means stars and galaxies are emitting a color that is shifting toward the red end of the color spectrum. this indicates

iren [92.7K]

Increasing ; moving away

This indicates the light's wavelengths are (increasing) and the star or galaxy is (moving away.)

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3 years ago

Read 2 more answers

When is it necessary to use relativistic quantum mechanics?

Ugo [173]

Answer:

To see objects smaller than microscopic limits

Explanation:

The theory of Relativistic Quantum mechanics can be applied to particles that are massive and propagates at all velocities even those which are comparable to the speed of light and is capable to accommodate particles that are mass less. This theory find its application in atomic physics, high energy physics, etc.

It is necessary to use relativistic quantum mechanics when it is desired to see the objects that are too small to be seen with the help of microscope.

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3 years ago

What is the frequency of motion of a 0.50 m long pendulum?

IgorC [24]

Complicated 2-step process.

1. Write down the formula for "frequency of a pendulum" from your textbook. 

f = (1/2pi) * sqrt(g/L) 

2. Plug in g and L.

I hope this can help!

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3 years ago

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Can something with a positive velocity have a negative acceleration?

Dafna11 [192]

Answer:

positive direction with a changing velocity. An object which moves in the positive direction has a positive velocity. If the object is slowing down then its acceleration vector is directed in the opposite direction as its motion (in this case, a negative acceleration

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3 years ago

What are the forces that act on the ball pushed on the floor​?Plss answer

What are the forces that act on the ball pushed on the floor?Plss answer