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- Jan 11, 2012

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http://books.google.com.pr/books?id... in the ramp and pulley system shown?&f=false

And my second question is

tractor pulls a log that has a mass of 500 kg along the ground for 100 m. The rope (between the tractor and the log) makes an angle of 30° with the ground and is acted on by a tensile force of 5,000 N. How much work does the tractor do? (sin 30° = 0.5, cos 30° = 0.866, tan 30° = 0.57)

My answer is 250kJ and apparently the answer is 450kJ

This exercises are from the kaplan book, and I'm being very stubborn with these two exercises and I think Kaplan is wrong...