Tow Cable
Posted on Monday, April 28, 2008 in Model Tanks
How much work does the cable do?
A tow truck pulls a car 4.85 km along a horizontal roadway using a cable having a tension of 800 N.
(a) How much work does the cable do on the car if it pulls horizontally?
= J
How much work does the cable do on the car if it pulls at 38.5° above the horizontal?
= J
(b) How much work does the cable do on the tow truck if it pulls the car horizontally?
= J
How much work does the cable do on the tow truck if it pulls the car at 38.5° above the horizontal?
= J
a) WD = F x s = 800 x 4.5 x 1000 J = 3.6 MJ
WD = Fcos38.5 x s = 800cos38.5 x 4.5 x 1000 J = 3.6cos38.5 MJ
b) the negative answers to (a)
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