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Q. A planet's moon travels in an approximately circular orbit of radius 6.6 x10^7 m with a period of 7 h 9 min. Calculate the mass of the planet from this information.

Q. A 54.5-kg skateboarder starts out with a speed of 1.75 m/s. He does +80.0 J of work on himself by pushing with his feet against the ground. In addition, friction does -265 J of work on him. In both cases, the forces doing the work are nonconservative. The final speed of the skateboarder is 6.10 m/s.

Calculate the change (ΔPE = PEf - PE0) in the gravitational potential energy.

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