Scientists determine the masses of planets by observing the effect of the gravitational field of those planets on nearby objects - mainly upon their moons. By measuring the
orbital period and orbital radius of a moon about a planet, Newton's laws of motion can
be used to determine the mass of the planet. Phobos, a moon of the planet Mars, was
discovered in 1877. Its orbital radius is 9380 km and its orbital period is 0.319 days (2.77
x 104 seconds). Determine the mass of Mars based o this data.

A250-n box is at rest on a frictionless horizotal floor. then a person shoves the box with a non-zero force of magnitude p. which statement best describes the relationship betweeen p and the motion of the box after it was shoved? -the box will not move when p< 250n but otherwise will accelerate at a constant rate that is directly proportional to p - the box will begin moving at a speed that is directly proportional to p, then will gradually slow to a halt -the box will move with constant velocity at a speed that is directly proportional to p -box will accelerate across the floor at a constant rate that is directly proportional to p

Gordon is going for a run through the park, but it is cold outside. the low outside temperature could affect his personal safety.

Give an example in which the electrical energy changes to light energy