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Category > Physics Posted 20 Apr 2017 My Price 6.00

The system of boxes

The system of boxes pictured is released from rest and immediately begins to slide. The 25 kg box is on a surface inclined at 62 degrees to the horizontal and has a kinetic friction coefficient 0.15. The 10 kg box is on a surface 10 kg inclined at 37 degrees and has a kinetic friction coefficient 0.18. The rope passes over a frictionless, 25 kg massless pulley.

Question: If the kinetic energy of the boxes is called ‘output’ and the work done by gravity is called ‘input’, calculate the efficiency [output/input] of the system.

[Hint: The net work done by the tension per unit of distance traveled is 0] [The efficiency of a process is the ratio of the quantity produced (output) to the quantity present

at the start of the process (input). ε = output/input. It is a ratio of like quantities so it has no units.]  

Answers

SuperTutor
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Status NEW Posted 20 Apr 2017 08:04 AM My Price 6.00

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