A solid disk (I=1/2mr 2 )of mass 0.75kg is initially at rest at the top of an in

Question

A solid disk (I=1/2mr2)of mass 0.75kg is initially at rest at the top of an incline of height h=2m.

aIf instead a solid sphere (I=2/5mr2)was allowed to roll down the same incline at the bottom its velocity would be

the same as the solid disk

less than the solid disk

greater than the solid disk

In Case 1 two people pull on the same end of a spring whose other end is attached to a wall. In Case 2, the same two people pull with the same forces, but this time on opposite ends of the spring.

b In which case does the spring stretch the most?

Case 1

Case 2

They will stretch the same amount

21)  If you want to send a signal using sound waves quickly, what material should you send it through?

air

water

lead

outer space

c If your guitar is playing a note that is too low, (frequency is too low) you should:

Loosen that string

Tighten that string

Throw it away

Join a rock band

Explanation / Answer

b) Case 1

21) convert it to electrical signal or radio wave and send it to a receiver at close to the speed of light. sound is pretty slow best to convert it send then convert it back. I think water is the best though if distance is your goal. for speed I'd go with air.

c) Tighten that string

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