1.A child rolls a ball on a level floor 3.5 m to another child. If the ball makes 15.0 revolutions, how many meters is its diameter?

Answer 1

If the ball makes 15 revolutions and travels 3.5 m, this means that the ball rolls 3.5 m / 15 for each revolution. This calculates to be 0.233 meters per revolution, which is equal to the circumference of the ball. The diameter of the ball can be obtained from the formula C = π x D where C is the circumference and D is the diameter. Substitute 0.233 meters for C and calculate D, which turns out to be 0.074 meters.