You have two pieces of jewelry. One of them is supposed to be pure silver. The first piece has a mass of 20.0 g and the other
piece has a mass of 44.0 g. Both pieces displace 4.0 mL of
water. Silver has a density of 10.5 g/cm3. Which piece is actually silver?

An automobile of mass 2000 kg moving at 30 m/s is braked suddenly with a constant braking force of 10000 n. how far does the car travel before stopping?

Name three different units of energy used to measure heat and describe what type of situations each is usually used.

Light traveling in water, nwater = 1.33, strikes a plastic block at an angle of incidence of 51.4°; part of the beam is reflected and part is refracted. if the index of refraction of the plastic is 2.0, what is the angle made by the reflected and refracted beams?