343.W/M^2 of energy is emitted by the sun to the earth. how much actually reaches the earth's surface? A. About one fourth
B. Almost all
C. About a third
D. About half

Two objects of different mass start from rest, are pulled by the same magnitude net force, and are moved through the same distance. the work done on object 1 is 900 j. after the force has pulled each object, object 1 moves twice as fast as object 2. how much work is done on object 2?

Astudent pushes a 60-n block across the floor for a distance of 10 m. how much work was done to move the block

An atom that has gained or lost electrons is called an _