Acoin placed 30.8 cm from the center of a rotating, horizontal turntable slips when its speed is 50.8 cm/s.
(a) what force causes the centripetal acceleration when the coin is stationary relative to the turntable?
(a) static friction
(b) inertia
(c) kinetic friction
(d) centrifugal force

(b) what is the coefficient of static friction between coin and turntable?

10 kg of co2 is initially contained at 400 kpa and 300 k. the gas constant for carbon dioxide is 189 j/lkg k) and has a specific heat ratio, k, of 1.289. isentropic expansion then occurs until the pressure is 200 kpa. a) determine the initial volume of co2 in m. b) determine the final temperature in k. c) determine the work done by the system during the expansion kl.