Which best describes the speed and velocity of the graph?
a) both speed and velocity are changing.
b) the speed and velocity remain constant.
c) the speed is constant and velocity is changing.
d) the velocity cannot be determined from the graph.

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? 1. write the equation 2.list out your known variables 3.plug the numbers into the equations 4.solve 5.write your solution statement that includes initial energy and final

Two steel balls, each of mass m, are welded to a light rod of length l and negligible mass and are initially at rest on a smooth horizontal surface. a horizontal force of magnitude f is suddenly applied to the rod as shown. determine (a) the instantaneous acceleration a of the mass center g and (b) the corresponding rate at which the angular velocity of the assembly about g is changing with time.

The direction of the current in an alternating current circuit remains constant. is direct. changes repeatedly. changes randomly.