ch07-p063 - 63. (a) In 10 min the cart moves d = 6.0 so...

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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. 7-7 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. 7-42, and the conversion to horsepower (hp) can
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