8. [6/12 Points] DETAILS PREVIOUS ANSWERS SERCP11 4.3.P.019. 2/5 Submissions Used Calculate the magnitude of the normal force on a 12.7 kg block in the following circumstances. (Enter your answers in N.) HINT (a) The block is resting on a level surface. N (b) The block is resting on a surface tilted up at a 35.80 angle with respect to the horizontal. (c) The block is resting on the floor of an elevator that is accelerating downward at 5.03 m/5-. N (d) The block is on a level surface and a force of 175 N is exerted on it at an angle of 35.80 above the horizontal. N