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63. (a) In 10 min the cart moves
mi
5280 ft/mi
6.0
(10 min)
5280 ft
h
60 min/h
d
§·
§
·
==
¨¸
¨
¸
©¹
©
¹
so that Eq. 77 yields
5
cos
(40 lb)(5280 ft) cos 30
1.8 10 ft lb.
WF
d
φ
°
=
×
⋅
(b) The average power is given by Eq. 742, and the conversion to horsepower (hp) can
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 Spring '09
 NAJAFZADEH
 mechanics, Power

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