Aconcave lens has an inward curved shape. it refracts light outward from the lens. the light rays spread apart as they exit the lens. which represents a concave lens?

A1200 kg car traveling north at 10 m/s is rear-ended by a 2000 kg truck traveling at 30 m/s. what is the total momentum before and after the collision?

The graph describes the motion of an object. the object moves with from a to b. it from b to c. it moves with from c to d.

A0.750 kg aluminum pan is removed from the stove and plunged into a sink filled with 10.0 kg of water at 293 k. the water temperature quickly rises to 297 k. what was the initial temperature of the aluminum pan? the specific heat of aluminum is ca = 900 j/(kgk) and water is cw = 4190 j/(kgk)