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what depends if the universe is expanding or not

H, (see Hubble's Law)

Answered by Huairen Z. • Physics tutor

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What are Newton's 3 laws of motion?

There is a train A. On the roof of A is another frictionless train B of mass Mb. A mass Mc hangs off the front of A and is attached to the front of B by rope and frictionless pulley. How fast should A accelerate so that B wont fall off the roof of A.

What is simple harmonic motion?

A ball is hit horizontally at a height of 1.2 m and travels a horizontal distance of 5.0 m before reaching the ground. The ball is at rest when hit. Calculate the initial horizontal velocity given to the ball when it was hit.

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