A moon of mass ‘m’ orbits a planet of mass ‘M’ in a perfectly circular orbit of radius R, with a force of gravitational attraction between the two bodies of Fg. How much work is done on the moon by the planet during a single orbit of the moon

Atriangle with equal sides of length 10 cm has -2.5-nc charged objects at each corner. part a determine the direction of the electrical force exerted on the object at the top corner due to the two objects at the horizontal base of the triangle. determine the direction of the electrical force exerted on the object at the top corner due to the two objects at the horizontal base of the triangle. horizontally rightward vertically downward vertically upward horizontally leftward