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# HW13 - schneiter(tcs639 HW13 Ross(89152 This print-out...

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schneiter (tcs639) – HW13 – Ross – (89152) 1 This print-out should have 7 questions. Multiple-choice questions may continue on the next column or page – find all choices before answering. 001 10.0 points A(n) 0 . 595 kg soccer ball approaches a player horizontally with a speed of 19 . 5 m / s . The player illegally strikes the ball with her hand and causes it to move in the opposite direction with a speed of 31 . 7 m / s . What is the magnitude of the impulse de- livered to the ball by the player? Correct answer: 30 . 464 kg m / s. Explanation: Basic Concept Impulse = F Δ t = mv f mv 0 . Let : m = 0 . 595 kg , v 1 = 19 . 5 m / s , and v 2 = 31 . 7 m / s , Solution: Impulse = m v 1 + m v 2 = (0 . 595 kg) [(19 . 5 m / s) + (31 . 7 m / s)] = 30 . 464 kg m / s . 002 10.0 points A 7 kg steel ball strikes a wall with a speed of 7 . 66 m / s at an angle of 31 . 9 with the normal to the wall. It bounces off with the same speed and angle, as shown in the figure. x y 7 . 66 m / s 7 kg 7 . 66 m / s 7 kg 31 . 9 31 . 9 If the ball is in contact with the wall for 0 . 271 s, what is the magnitude of the average force exerted on the ball by the wall?

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