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August 21, 2014

Homework Help: Physics Homework

Posted by Jenni on Tuesday, September 25, 2007 at 8:52pm.

I have a few questions that I dont understand and would like to get checked, please?

5.If energy is conserved and momentum is conserved, would they both have to be conserved simultaneously in some interaction?

My answer: No because each engergy and momemtum is being conserverd.

9. A 60 kg skydiver moving at terminal speed falls 50m in 1 s. What power is the skydiver expending on the air?

My answer: p=work/time
p=50m/1s=50 Watt

12.Where, exactly, does the energy stored in oil come from? How can we get "work" from oil? In your discussion, try to use the words work, energy, heat, power, and conservation in their correct physical sense.

-I dont understand this question.

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