Physics 1603 Exam Chapter 2 Review Questions and Answers 2023

Mark and David are loading identical cement blocks onto David's pickup truck. Mark lifts his block straight up from the ground to the truck, whereas David slides his block up a ramp on massless, frictionless rollers. Which statement is true? - -Mark and David do the same amount of work -Question Part Points Submissions Used If the speed of a particle is doubled, what happens to its kinetic energy? - -It becomes four times larger. -If the net work done on a particle is zero, which of the following statements must be true? - -The speed is unchanged. -Bob, of mass m, drops from a tree limb at the same time that Esther, also of mass m, begins her descent down a frictionless slide. If they both start at the same height above the ground, which of the following is true about their kinetic energies as they reach the ground? - -They have the same kinetic energy. -Three identical balls are thrown from the top of a building, all with the same initial speed. The first ball is thrown horizontally, the second at some angle above the horizontal, and the third at some angle below the horizontal, as in the figure below. Neglecting air resistance, rank the speeds of the balls and they reach the ground, from fastest to slowest. - -All three balls strike the ground at the same speed. -A bowling ball is suspended from the ceiling of a lecture hall by a strong cord. The ball is drawn away from its equilibrium position and released from rest at the tip of the demonstrator's nose, (a) If the demonstrator remains stationary, explain why the ball does not strike her on its return swing. - -Since the ball has to always spend some energy to overcome air resistance and fight through friction, the ball should come back and not hit the person in the face. There is no work being done on the ball so therefore it returns lower and if work was to be done then it would return at a higher rate.