How does density change when the state of matter changes from solid to liquid?

Acompound machine is also called a machine. a. force b. simple c. complex d. directional

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 first law of thermodynamics states that heat added to a system is neither created nor destroyed but is as it changes into other forms of energy.