Estimate the force a person must exert on a string attached to a 0.145 kg ball to make the ball revolve in a horizontal circle. The ball makes 2.20 revolutions per second (T = 0.455 s ). Don't ignore the weight of the ball which revolves on a string 0.500 m long.

The average atmospheric pressure on earth is approximated as a function of altitude by the relation patm = 101.325 (1 − 0.02256z)5.256, where patm is the atmospheric pressure in kpa, and z is the altitude in km with z = 0 at sea level. determine the approximate atmospheric pressures at atlanta (z = 306 m), denver (z = 1610 m), mexico city (z = 2309 m), and the top of mount everest (z = 8848 m).