Practice Problems 9: Work and Kinetic Energy Begin Date: 10/5/2016 12:00:00 AM D

Question

Practice Problems 9: Work and Kinetic Energy Begin Date: 10/5/2016 12:00:00 AM Due Date: 5/4/2017 12:02:00 AM End Date: 5 /4/2017 12:02:00 AM (7%) Problem 3: A 87.5. kg man pushes a crate 6.5 m up along a ramp that makes an angle of 15.5 with the horizontal He exerts a force of 485 N on the cratc parallcl to the ramp and moves it at a constant speed. Otheexpertta.com G A Calculate the work, in joules, that the man performs to cause the crate and himself to move up the ramp. Grade Summary W Deductions Potentia 100% 7 8 9 Submissions tan Attempts remaining: 3 cotan sino acoso 4 5 6 (49 per attempt) atan() acotano sinh detailed view cotanh() COS Degrees Radians Hint Feedback: 5% deduction per feedback Hints: 4% deduction per hint. Hints remaining: 1

Explanation / Answer

Work will be done on the crate as it is bieng pushed by force 485N for a distance of 6.5m Work done=force x distance Work done on the crate: W1 = 485 x 6.5 = 3152.5 Joules

As the man reaches the top he will have potential energy.

potential energy of the man : W2 = 87.5 x 9.81 x 6.5 sin(15.5o) = 1491.04 J

TOTAL WORK DONE = W1+W2 = 3152.5 + 1491.04 = 4643.54J

Hence the total work done is 4643.54 Joules.

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