l. Actionreaction pairs of forces. .. a) sometimes act on the same object b) Always act on the same object c) Always act on different objects (I) Are always at right angles to one another. 2. You are pushing a very heavy box across a rough floor. When you are initially pushing the box and it is accelerating... a) You exert a force on the box, but the box does not exert a force on you b) The b0x is so heavy that it exerts a force on you, but you do not exert a force on the box 0) The force you exert on the box is greater than the force of the box pushing back on you d) The force you exert on the box is equal to the force of the box pushing back on you c) The force that the box exerts on you is greater than the force you exert on the box. 3. A ball is whirled on the end of a string in a horizontal circle of radius R at constant speed v. Complete the following statement: The radial (centripetal) acceleration of the ball can be increased by a factor of 4 by: a) Keeping the speed xed and increasing the radius by a factor of 4 b) Keeping the radius xed and increasing the speed by a factor of 4 c) Keeping the radius xed and increasing the period by a factor of 4 d) Keeping the radius xed and decreasing the period by a factor of 4 e) Keeping the speed xed and decreasing the radius by a factor of 4 4. An object moves at constant speed in a circular path. Which of the following statements is/are true? I. The velocity is constant. 11. The acceleration is constant. III. The net force on the object is zero since its speed is constant. a) 11 only. b) I and 111 only. c) II and 111 only. d) I and II only. e) None of the above. 5. A child whirls a ball in a vertical circle. Assuming the speed of the ball is constant, when would the tension in the cord connected to the ball be the greatest? a) At the top of the circle b) At the bottom of the circle c) A little after the bottom of the circle when the ball is climbing d) A little before the bottom of the circle when the ball is descending quickly e) Nowhere; the cord is stretched the same amount at all points 6. (5 marks) Some hooligans up at UVic are taking advantage of the pandemic and the lack of pedestrians to see how fast they can drive around the University's Ring Road. The diameter of ring road is 600 m and the coefcient of static friction between the wheels of the car is 0.55. Using this information, determine how fast the car could drive around the ring without skidding out