3 years ago

SELECT ALL THE CORRECT ANSWERS

Physics

1 answer:

Aleonysh [2.5K]3 years ago

3 0

I think the answer is x

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A constant 10.0-N horizontal force is applied to a 20.0-kg cart at rest on a level floor. If friction is negligible, what is the

Otrada [13]

Answer:

2.83 m/s

Explanation:

Given:

Mass of the cart (m) = 20.0 kg

Initial velocity of the cart (u) = 0 m/s

Final velocity (v) = ? m/s

Displacement of the cart (S) = 8.0 m

Horizontal force acting on the cart (F) = 10.0 N

Surface is frictionless. So, only horizontal force is the force acting on the cart.

Now, as per work-energy theorem, the work done by the net force acting on a body is equal to the change in the kinetic energy of the body.

Here, the work done by the horizontal force is given as:

$W_{net}=FS=(10\ N)(8.0\ m)=80\ Nm$

The change in kinetic energy is given as:

$\Delta K=\frac{1}{2}m(v^2-u^2)\\\\\Delta K=\frac{1}{2}(20.0\ kg)(v^2-0)\\\\\Delta K=10v^2$

Now, from work-energy theorem:

$\Delta K=W_{net}\\\\10v^2=80\\\\v^2=\frac{80}{10}\\\\v=\sqrt{8}=2.83\ m/s$

Therefore, the speed of the cart when it has been pushed 8.0 m is 2.83 m/s.

5 0

3 years ago

The force component along the displacement varies with the magnitude of the displacement, as shown in the graph. (a) 0 to 1.0 m,

Lina20 [59]

Work is force*displacement if the force and displacement is parallel.

a. You can average the force over the distance so W = Fave*d

<span>b The force part of that multiplication is zero. </span>

<span>c. You can form the average force for the interval from 2 to 3 and find the work for that section and then consider the interval from 3 to 4, find the work and add the 2 work results.

I hope my answer has come to your help. Thank you for posting your question here in Brainly. We hope to answer more of your questions and inquiries soon. Have a nice day ahead!

</span>

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The state of matter that has particles in a fixed position, with a definte volume and shape is

Rainbow [258]

That's the description of the SOLID phase of matter.

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3 years ago

A police officer uses a radar gun to determine the speed of a car. A specialized radar gun uses ultraviolet light to determine t

Virty [35]

Answer:

A transverse and D electromagnetic

on edg2020

Explanation:

I got it right on the test

good luck

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3 years ago

Read 2 more answers

The great lakes in north american hold about what percent of earth's fresh surface water?

fenix001 [56]

The answer is 20 percent

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3 years ago