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Physics 112
Homework #7 Fall 2006
Read:
Chapter 6, intro., sections 6.16.3
Chapter 7, intro., sections 7.17.3
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
crosssectional 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
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This note was uploaded on 08/12/2008 for the course PHYS 1112 taught by Professor Leclair,a during the Fall '07 term at Cornell University (Engineering School).
 Fall '07
 LECLAIR,A
 mechanics, Work

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