EK Study Group Friends unite -- I need some help...

Discussion in 'MCAT: Medical College Admissions Test' started by Docsaintrita71, Apr 20, 2007.

1. Docsaintrita71 NYCOM Class 2012 2+ Year Member

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Hello to anyone/everyone who answers this thread. I hope studying is going well for you. As for me, I have some nagging questions - one in particular right now. I would really appreciate your help!! I'm reviewing EK Physics and one of the end of the section questions is STILL giving me a little trouble. Please help if you can. Here it is....THANKS! (EK Physics #34)

The owner of a warehouse asks an engineer to design a ramp which will reduce the force necessary to lift boxes to the top of a 1/2meter step. If there is only room enough for a 4meter ramp, what is the maximum factor by which the lifting force could be reduced. (Answer is D -- but, how do you get from 1/2 to 4 by a factor of 8???)
A. 1/2
B. 2
C. 4
D. 8

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3. sexyman 5+ Year Member

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Ha this one drove me crazy.

w=Fd

Since the work won't change and you are changing the distance from .5 to 4 you are decreasing the force by a factor of 8 because you needed to multiply .5 by 8 in order to get 4.

So basically because you increased the distance by a factor of 8 you decrease the force by a factor of 8.

I hope this makes sense, and I hope I am right lol.

4. Kraazy 7+ Year Member

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That's right. My only gripe w/ this question is that it's not completely clear whether the 4m refers to the horizontal space available for the ramp or the hypothenuse of the ramp. The 2nd option was the only one that made sense given the info provided and the answer choices, but I was confused for a while there.

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