Calculate the magnitude of the normal force on a 12.7 kg block in the following circumstances. (Enter your answers in N.)   (a) The block is resting on a level surface. N   (b) The block is resting on a surface tilted up at a 20.8° angle with respect to the horizontal. N   (c) The block is resting on the floor of an elevator that is accelerating upward at 2.28 m/s2. N (d) The block is on a level surface and a force of 165 N is exerted on it at an angle of 20.8° below the horizontal. N

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