Author Question: A playground merry-go-round with a radius of 1.8 m and a rotational inertia of 120 kg m2 is ... (Read 122 times)

WhattoUnderstand · **on:** Jul 29, 2018

A playground merry-go-round with a radius of 1.8 m and a rotational inertia of 120 kg m2 is stationary.

A child with a mass of 25 kg gets on and walks around the edge of the merry-go-round. How many revolutions around the merry-go-round must the child make in order for the merry-go-round to make one full revolution?
A)

2.5 revolutions
B)

1.5 revolutions
C)

3.0 revolutions
D)

1.0 revolutions
E)

2.0 revolutions

Question 2

Kepler's third law can be used to compare the Moon's orbit around the Earth to the orbit of the Earth around the Sun.

Indicate whether the statement is true or false