Please help with C and D please

8) (23.5 points total) Zorch, an archenemy of Superman, decides to slow Earth's rotational period from 24.0 hours to 28.0 hours. He will accomplish this by exerting an opposing force at and parallel to Earth's equator. 8a) (5.5 points) Convert the two rotational periods (1 rotation every 24.0 hours and 1 rotation every 28.0 hours) into angular velocities (measured in rad/s). 8c) (6.5 points) If the magnitude of the force that Zorch can exert on the Earth is 4.20x 107 N, use the rotational version of Newton's 2nd Law to determine the angular acceleration that Earth will have because of Zorch's efforts. 8d) (6.5 points) How long must Zorch push on the Earth with his force in order to accomplish his goal? Report your answer in kiloyears using the fact that 1 year = 365.25 days