Which object would require the most amount of energy, or force, to set it into motion?
A. a school bus
B. a refrigerator
C. a microwave
D. a houseplant

Astronomers discover an exoplanet (a planet of a star other than the sun) that has an orbital period of 3.87 earth years in its circular orbit around its sun, which is a star with a measured mass of 3.59 x 1030 kg. find the radius of the exoplanet's orbit.

Awheel of mass 48 kg is lifted to a height of 0.8 m. how much gravitational potential energy is added to the wheel? acceleration due to gravity is g = 9.8 m/s2. a. 30.4 j b. 3.1 j c. 297.9 j d. 11,321 j

4. if you were an astronaut on the moon, what would you experience? what would you see from your perspective?