A planet of mass 700 1025 kg is in a circular orbit of, Ask an Expert

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A planet of mass 7.00 1025 kg is in a circular orbit of radius 6.00 1011 m around a star. The star exerts a force on the planet of constant magnitude 6.51 1022 N. The speed of the planet is 2.36 104 m/s.

(a) In half a "year" the planet goes half way around the star. What is the distance that the planet travels along the semicircle?

distance = m

(b) During this half "year", how much work is done on the planet by the gravitational force acting on the planet?

work = J

?K = J

(d) What is the magnitude of the change of momentum of the planet?

|?p| = kg Â· m/s

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