3. Inside most ball-point pens inside a small spring that compresses as the pen is pressed against the paper. If a force of 0.1 N compresses the pen's spring a distance of 0.005 m, what is the force
constant of the tiny spring?

The passing of heat through a material while the material itself stays in place. a. radiation b. conduction c. convection

Why is the energy that results from a roller coaster's position at the top of a hill referred to as potential energy?

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.