Which statement about the physical change of liquid water boiling into steam is true?
The heat added represents an energy change.
O The action cannot be reversed.
The steam cannot conserve mass.
The weight lost represents a mass change.

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.