If the arm is 5.50-m long and pivots about one end at what, Ask an Expert

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Q. If the arm is 5.50-m long and pivots about one end, at what angular speed (in rpm) should it spin so that the acceleration of the lander is the equal as acceleration because of gravity at the surface of Europa? The mass of Europa is 4.8 times 10^ (22) Kg and its diameter is 3138 km.

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