(a) True. The Earth’s motion around the Sun isn’t uniform due to its elliptical orbit, causing variable speeds.
(b) True. The Moon’s circular motion around Earth involves continuous changes in velocity direction, indicating acceleration.
(c) True. Unlike uniform linear motion, uniform circular motion involves continuous changes in velocity direction, resulting in centripetal acceleration.
(d) False. Although speed remains constant in uniform circular motion, velocity (including direction) changes continuously.
(e) False. The force felt by the hand in rotating an object is centripetal, not centrifugal.