PHYS 221 Sample questions chapter (8-11) 10. 11. 12. 13. 14. 2 kg object is moving to the right with speed of l mfs when it experiences an impulse of -4 N 5. What are the objects's speed and direction after the impulse? (ans - 1 mjs) At what Speed do a bicycle and its rider, with a combined mass of 100 kg, have the same momentum as a 1500 kg car travelling at 5.0 m/s? (TB) A small ball, light ball S and a large, heavy ball L move towards each other, collide, and bounce apart. a. Compare the force that S exerts on L during the collision to the force that L exerts on S. That is , is F3 0,, L. larger, smaller, or equal to FL 0,, 3? Explain. b. Compare the time interval during which S experiences a force to the time interval during which L experiences a force. Are they equal, or is one longer than the other? c. Sketch a graph showing a plausible F50" L as a function of time and another graph showing a plausible FL 0,, S as a mction of time. Be sure to think the sign of each force. d. Compare the impulse delivered to S to the impulse delivered to L. Explain. e. Compare the momentum change of S to the momentum change of L. A 20 g ball of clay travelling east at 3.0 111/ s collides with a 30 g ball of clay travelling north at 2.0 m/s. What are the speed and the direction of the resulting 50 g ball of clay? Give your answer as an angle north of east. (ans45 north of east at 1.7 m/s ) A particle moving to the left is slowed by a force pusing t othe right. Is the work done on the particle positive or negative? Or is there not enough information to tell? Expain. Evaluate the dot product if a. A=3i+4j andB=216]' b. 110" f-J "B? 4 A 1.0 kg object has the potential energy shown in the graph