24. 25. H1 The direction of the positively charged particle's velocity according to the diagram above must_be a. to the left b. to the right c. upward d. out of the page, perpendicular to the page e. into the page, perpendicular to the page The equation E = mo2 illustrates that a. traveling at the speed of light converts matter into energy rest mass and energy are equivalent energy can be converted into mass b. c. d. matter can be converted into energy e. both b and d An elevator is moving upward. Which one of the following statements about the forces on the elevator is true? (a) There must be an unbalanced force upward (b) There must be an unbalanced force downward (c) The forces upward and downward must be equal (d) The forces upward and downward may be equal or unequal (e) The forces upward and downward must be unequal 26. 2?. 28. 29. One newton is equivalent to (3)1 kg-m (m1 kg-mi's (c) 1 kg-m!s2 (d) 1 lag-mz'ls2 (e) 1 mftkg-sz) Two objects, one having three times the mass of the other, are dropped from the same height in a vacuum. Their velocities, on reaching the end of their fall are equalbecause (a) the velocity of anything falling in a vacuum is constant (b) all objects reach the same terminal velocity when dropped from great heights (c) the acceleration due to gravity of the larger object is three times the acceleration due to gravity of the smaller object (d) the force of gravity acting on both objects is the same (e) the acceleration due to gravity for both objects is the same cole and cole are sitting in the cafeteria eating lunch. They move so that the distance between them is now one quarter as great as it was before. The force of attraction between them (gravitational, that is) is now about (a) one sixteenth as great (b) one quarter as great (c) four times as great (d) eight times as great (e) sixteen times as great Time is a. dependent on the observerd. d. simultaneous in all cases b. absolute e. never changing c. the same for different observers