Page 1630 - College Physics For AP Courses
P. 1630
1618 Answer Key
71
20.9 min
73
(a) 3.96×10-2 g
(b) 96.2 J
(c) 16.0 W 75
(a) 1.102
(b)
(c) 12.6 J. This will not cause a significant cooling of the air because it is much less than the energy found in part (b), which is the energy required to warm the air from to .
76
(a)
(b) Any temperature increase greater than about would be unreasonably large. In this case the final temperature
of the person would rise to .
(c) The assumption of heat retention is unreasonable.
78
(a) 1.46 kW
(b) Very high power loss through a window. An electric heater of this power can keep an entire room warm.
(c) The surface temperatures of the window do not differ by as great an amount as assumed. The inner surface will
be warmer, and the outer surface will be cooler.
Test Prep for AP® Courses
1
(c)
3
(a)
5
(b)
7
(a)
9
(d)
Chapter 15
Problems & Exercises
1
3
5
(a) , or
(b) 5.00%
7
(a) 122 W
(b)
(c) Work done by the motor is ;thus the motor produces 7.67 times the work done by the man 9
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