1.Energy is used when a force acts over a

2.All objects have the same weight have:

a)the same place on Earth
b)the same mass
c)the same volume
d)pull of gravity on them

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You can decrease the resistance of a length of wire by

The energy equivalent of the rest mass of an electron is

Abaseball is thrown from the outfield toward the catcher. when the ball reaches its highest point, which statement is true? (a)its velocity is not zero, but its acceleration is zero. (b) its velocity and its acceleration are both zero. (c) its velocity is perpendicular to its acceleration. (d) its acceleration depends on the angle at which the ball was thrown. (e) none of the above statements are true.