Look at the picture below. the boy is swinging back and forth on the swing. at which point is the potential energy of a swing the greatest? point a (top) point b (halfway down) point c (bottom) point d (halfway up)

In a heat engine if 1000 j of heat enters the system the piston does 500 j of work, what is the final internal energy of the system if the initial energy was 2000 j ?

Which force is most responsible for binding together an atom's protons and neutrons? electrostatic gravitational nuclear magnetic

The 10-kg double wheel with radius of gyration of 125mm about o is connected to the spring of stiffness k = 600 n/m by a cord which is wrapped securely around the inner hub. if the wheel is released from rest on the incline with the spring stretched 225 mm, calculate the maximum velocity v of its center o during the ensuing motion. the wheel rolls without slipping