Calculate the magnitude of the normal force on a 22.7 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 35.8° angle with respect to the horizontal. N (c) The block is resting on the floor of an elevator that is accelerating downward at 4.53 m/s2. N (d) The block is on a level surface and a force of 115 N is exerted on it at an angle of 35.8° below the horizontal. N

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