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# HW_7 - Physics 112 Read Homework#7 Fall 2006 Chapter 6...

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Physics 112 Homework #7 Fall 2006 Read: Chapter 6, intro., sections 6.1-6.3 Chapter 7, intro., sections 7.1-7.3 For discussion: Chap. 6:Qs #Q6.2, Q6.4,Q6.5, Q6.7, Q6.10, Q6.11, Q6.12, Q6.13 (not turned in)Chap. 6:Es & Ps #6.1, 6.9, 6.19, 6.25, 6.27, 6.73, 6.83, 6.25, 6.39, 6.41, 6.73, 6.8 Chap. 7:Qs #Q7.1, Q7.2, Q7.4, Q7.6, Q7.8, Q7.9, Q7.10, Q7.11, Q7.12, Q7.19 Chap. 7:Es & Ps #7.5, 7.9, 7.11, 7.43, 7.45, 7.49, 7.59, 7.75 Due Friday, Oct. 13 at lecture: #7.12 [Tarzan & Jane] #7.55 [Atwood's Machine] #7.72 [Fish on a Spring] #7.36 [conservative force] 1. Automobile energy use. A certain midsize car has mass 1500 kg, front cross-sectional area 1.8 m 2 , air drag coefficient 0.30, and tires with coefficient of rolling resistance 0.010. (a) What is the air drag force (in N) acting on the car when it is moving at 50 mi/h (= 22 m/s)? What power does this drag force dissipate (in kW and hp)? What is the air drag force at 65 mi/h (= 29 m/s)? What power does this force dissipate (in kW and N)? (b) What total power (in hp) must the car's engine supply to overcome air drag
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