A force of 8 N is exerted in bringing a 100-N object to a stop. a) If it took 2 meters, what was the object's starting KE?

b) What was the objects initial velocity? (Hint: make work negative, with d=-2m)

A175 g lump of molten lead at its melting point (327 c) is placed into 55.0 g of water at 20.0 c. the specific heat of lead is 130.j/kg c and the hf of lead is 20,400 j/kg. when the lead and the water have reached equilibrium, what is the temperature of the mixture?

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.

For most stars, what does a higher temperature tend to to with? a lower luminosity a higher luminositya red color none of the above