Problem based on massless seesaw
A boy and a girl are balanced on a massless seesaw. The boy has a mass of 75 kg and the girls mass is 50 kg. If the boy sits 2.0 meters from the pivot point on one side of the seesaw, where must the girl sit on the other side?
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Light with a frequency of 2 X 10^15 Hz shines on a copper surface (=4.70 eV). What is the maximum kinetic energy of the photoelectrons?
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A 68.5 kg astronaut is doing a repair on the space station. She throws a 2.25 kg tool away from her at 3.20 m/s. With what speed and direction will she begin to move?
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