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Q. A flat sheet of ice has a thickness of 3.5 cm. It is on top of a flat sheet of diamond that has a thickness of 3.6 cm. Light strikes the ice perpendicularly and travels through it and then through the diamond. In the time it takes the light to travel through the two sheets, how far would it have traveled in a vacuum.

Q. A child exerts a tangential 47.6 {N} force on the rim of a disk-shaped merry-go-round with a radius of 2.10 {m}. If the merry-go-round starts at rest and acquires an angular speed of 0.0800 {rev/s} in 3 {s}, what is its mass?

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