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GR8677 #93 |
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Problem
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Mechanics }Power
Recall the following basic formulas,  , where  is power,  is current,  is voltage,  is force, and  is velocity.  , where  is the efficiency, which relates work (and thus power).
The problem gives  ,  ,  ,  ,  ---where all units are SI.
Thus  . Solve for  , as in choice (D).
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Comments |
Poop Loops
2008-09-23 21:04:09 | Not only did I think that you couldn't have a CoF > 1, since friction is only a retarding force, but I also thought "normal" meant "normal to the surface". I had no idea it was pushing parallel to the surface. I just didn't understand how a vertical force related to the parallel energy being released.
Apparently you CAN have CoF > 1, though. |  | Furious
2007-11-01 18:40:00 | Was I the only one who thought that you couldn't have a coefficient of friction greater than one? | |
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