Question Detail
Question
A cockroach rides the rim of a rotating merry-go-round. If the angular speed of this system (merry-go-round + cockroach) is decreasing, the cockroach has
Correct Answer
Option A is the correct answer.
Detailed Explanation
If the angular speed is decreasing, there is an angular deceleration. This means the cockroach has a tangential acceleration (due to change in speed). It also always has a radial (centripetal) acceleration as long as it is moving in a circle (due to change in direction).
Hint
Circular motion always requires centripetal acceleration. Changing speed adds tangential acceleration.