p05 076

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76. We note that mg = (15)(9.8) = 147 N.

(a) The penguin’s weight is W = 147 N.

(b) The normal force exerted upward on the penguin by the scale is equal to the gravitational pull W on

the penguin because the penguin is not accelerating. So, by Newton’s second law, N = W = 147 N.

(c) The reading on the scale, by Newton’s third law, is the reaction force to that found in part (b). Its

magnitude is therefore the same: 147 N.


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