[填空题]
A merry-go-round has a massb6 lc0 xtm2ei) oh:4 n;hhtx fe dvo209tf 1640 kg and a radius of 7.50 m. How much net work is required to accelerate it from rest to a rotation rate of 1.00 revolution per 8.00 s? Assume it 2 0h:ndevx; hof4th t9is a solid cylinder. J