Question

Two astronauts of roughly equal mass are floating in space. They both hold onto a light rod 20 m long, and the whole system is rotating about the center of the rod about once every 30 s.

a) What is the tangential speed of each astronaut?

b) Now imagine the astronauts pull themselves along the rod until they are 10 m apart. What is their tangential speed now?

c) Where do you think that their increased kinetic energy came from?

Answer 1

The energy increases comes from when astronauts try to come near to each other so they apply some force and work done so that work done increases the energy.

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