final5

QUESTION 5 A child applies a 25 N force tangentially to the edge of a ‘'merry-go-round’. The force is applied for a period of 12 s. The ‘merry-go-round’ has a radius of 2.5 m and a moment of inertia of 2000 kgm2 about a vertical axis through its centre, and it turns with negligible friction. a. If the ‘merry-go-round’ is initially at rest, what is its angular acceleration? (1 Mark) b. What is its angular speed after the 12 s interval? (1 Mark) c. Calculate the linear speed at the rim of the ‘merry-go-round’. (1 Mark) d. How much work did the child do on the ‘merry-go-round’? (1 Mark) e. What is the average power supplied by the child? (1 Mark) @, Child applies 6 /, tangential force. 2 **’wr/%} r=la=FR w=o,+al 0=06,+ c.qlva—i V=R® W=6=AE, =12 2 P=— I