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prisoha [69]
3 years ago
8

According to the concept of length contraction, what happens to the length of an object as it approaches the speed of ligh and t

hen slows down, eventually coming to a stop? O It is always observed as contracting It is always observed as the same length O It is observed as expanding and then contracting back to its original length O It is observed as contracting and then expanding back to its original length
Physics
2 answers:
alexgriva [62]3 years ago
6 0

Answer:

When an object moves its length contracts in the direction of motion. The faster it moves the shorter it gets in the direction of motion. The object in this question moves and then stops moving. So it's length first contracts and then expands to its original length when the motion stops. The speed doesn't have to be anywhere near the speed of light. When the object moves its length contracts no matter how fast or slow it's moving.

Explanation:

vladimir1956 [14]3 years ago
6 0

Answer:

When an object moves its length contracts in the direction of motion. The faster it moves the shorter it gets in the direction of motion. The object in this question moves and then stops moving. So it's length first contracts and then expands to its original length when the motion stops. The speed doesn't have to be anywhere near the speed of light. When the object moves its length contracts no matter how fast or slow it's moving.

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Could anyone help me figure out d and e? How can you find the work of the friction when the force of friction is not given?
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Wow !  This is not simple, Shoot, and I give you a lot of credit
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I scratched my head for a few minutes, and I think I've got it.
Here's what I think is going on:

KE₁ = KE of the box before pushing
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KE₂ = KE of the box after pushing 3m
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The box gained (160 - 40) = 120 J of kinetic energy.

Now look at the cluttered force diagram.
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Only 120 J of that energy showed up as increased kinetic energy
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              240 J / 3 m  =  friction 'force'  =  80 N . 

I think that's it.

What I did was:

-- Find the work that Cat did.

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Does this do anything for you ?
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