A lamp of mass m hangs from a spring scale which is attached to the ceiling of a

Question

A lamp of mass m hangs from a spring scale which is attached to the ceiling of an elevator. When the elevator is stopped at the ground floor it reads mg. The elevator then goes up to the fortieth floor. W does the scale read as the elevator is slowing down to stop at the fortieth floor? more than mg mg less than mg zero can't tell Explain your answer. A hiker tries to walk up a rock face t gets steeper and steeper. He find t his boots start to slip when the angle of the face reaches about 45degree. He returns to camp and puts on a heavy backpack and tries again. How far does he get carrying the additional weight? not as far about the same farther Explain your answer.

Explanation / Answer

5) the elevator slow down to the fortieth=> the acceleration isdownward => the tension(new reading) :mg -T=ma => T= mg-ma less than mg => answerC 6) when his boot start slip=> the friction force :mgsin =F=mgcos => tan = does not depend onthe mass => he get the same distance => answer B: about the same

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