[填空题]
A 175-kg ball on the end of a string is revolvxtpr 3xh x mc(h,us.6,ing uniformly in a horiz9cg4kvk +j5ly ontal circle of radi9k4+jkcvlg5 yus 0.500
m. The ball makes 2.00 revolutions in a second. (only fill in numerial value in the blanks)
(a) Determine the speed of the ball. $m/s$
(b) Determine the ball's centripetal acceleration. $m/s^2$
(c) Determine the force a person must exert on opposite end of the string. $N$
