One end of spring is attached to a wall. The other end is attached to a movable block. If you pull the block so as to stretch the spring, is the work done by the spring on the block during the motion positive, negative, or zero

Because light travels in a straight line and casts a shadow, isaac newton hypothesized that light is

The earth exerts a gravitational force of 500 n on amy. what is amy’s mass in kg?

The air in an automobile tire with a volume of 2.60 ft3 is at 70°f and 21 psig. determine the amount of air that must be added to raise the pressure to the recommended value of 30 psig. assume the atmospheric pressure to be 14.6 psia and the temperature and the volume to remain constant. the gas constant of air is ru = 53.34ft⋅lbflbm⋅r(1 psia144 lbf/ft2) = 0.3704 psia⋅ft3lbm⋅r the amount of air that must be added to raise the pressure is lbm