A tow truck pulls a car 5.50 km along a horizontal roadway using a cable having

Question

A tow truck pulls a car 5.50 km along a horizontal roadway using a cable having a tension of 900 N

Part A

How much work does the cable do on the car if it pulls horizontally?

Part B

How much work does the cable do on the car if it pulls at 34.5 above the horizontal?

Part C

How much work does the cable do on the tow truck if it pulls horizontally?

Part D

How much work does the cable do on the tow truck if it pulls at 34.5 above the horizontal?

Part E

How much work does gravity do on the car in part A?

Explanation / Answer

a) Work done=F.d

W =900*5500

W =4.95 *10^6J

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b) Work done=F.d

W = FdCos

W =900*5500*Cos34.5

W =4.07 *10^6J

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c)Work done by the cable on the tow truck=F.d

W =-Fd

W = - 4.95 *10^6 J

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d) above the horizontal=F.d

W = - FdCos145.5

W =-4.07 106J

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e)Zero since gravity is perpendicular to displacement.

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