A playground merry-go-round has radius 2.40 m and moment of inertia 2100 kg m² about a vertical axle through its center, and it turns with negligible friction. (a) A child applies an 18.0 N force tangentially to the edge of the merry-go-round for 15.0 s. If the merry-go-round is initially at rest, what is its angular speed after this 15.0-s interval? (b) How much work did the child do on the merry-go-round? (c) What is the average power supplied by the child?
University of Ilorin PHY101 2026-exam past question
- (a) 0.309 rad/s; (b) 100 J; (c) 6.67 W
- (a) 0.309 rad/s; (b) 200 J; (c) 13.3 W
- (a) 0.618 rad/s; (b) 400 J; (c) 26.7 W
- (a) 0.154 rad/s; (b) 25 J; (c) 1.67 W
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