4.52. Set Up:is the force of gravity exerted on you, independent of your motion. Your mass isUse coordinates with upward. Your free-body diagram is given in Figure 4.52. nis the scalereading, the force the scale exerts on you. You and the elevator have the same acceleration.Figure 4.52Solve:gives so (a)so is positive so the acceleration is upward.(b)so is negative so the acceleration is downward.4.53. Set Up:Use coordinates with horizontal and in the direction of the motion of the ball and with upward.Solve: (a)givesgives (b)The free-body diagram while the ball is in contact with the racket is given in Figure 4.53a. is the force exertedon the ball by the racket. After the ball leaves the racket,ceases to act, as shown in Figure 4.53b.Figure 4.534.54. Set Up:Let mbe the mass of the tool. There is no friction. Use coordinates where is horizontal, in thedirection of the 12.0 N force, and let be downward.Solve:First find the mass m:givesgives and Find the acceleration due to gravity on Newtonia. gives The weight on Newtonia is
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This note was uploaded on 03/06/2009 for the course PHYS 114 taught by Professor Shoberg during the Spring '07 term at Pittsburg State Uiversity.