balance moon stone

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A space traveler about to leave for the moon has a spring balance and a 1.0 kg mass A, which when hung on the balance on the Earth gives the reading of 9.8 newtons. Arriving at the moon at a place where the acceleration of gravity is not known exactly but has a value of about 1/6 the acceleration of gravity at the Earth's surface, he picks up a stone B which gives a reading of 9.8 newtons when weighed on the spring balance. He then hangs A and B over a pulley as shown in the figure and observes that B falls with an acceleration of 1.2 m s2 . What is the mass of stone B?


Solutions (listed by author)

Valentin Eberhardt  (html, 3k)

Michael A. Gottlieb  (html, 3k)

Gert Hamacher  (pdf, 72k)


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