The two forces F, and Fshown in Figure 1) act on a 21.0-kg object on a frictionless tabletop. Suppose that
F1 = 10.4 N and F2 = 18.6 N
Part A
Determine the magnitude of the net force on the object for the diagram (a) in the figure.
Express your answer to three significant figures and include the appropriate units.

An athlete swings a ball, connected to the end of a chain, in a horizontal circle. the athlete is able to rotate the ball at the rate of 8.13 rev/s when the length of the chain is 0.600 m. when he increases the length to 0.900 m, he is able to rotate the ball only 6.04 rev/s. (a) which rate of rotation gives the greater speed for the ball? 6.04 rev/s 8.13 rev/s (b) what is the centripetal acceleration of the ball at 8.13 rev/s? m/s2 (c) what is the centripetal acceleration at 6.04 rev/s? m/s2