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cocopops93

Joined: 21 Oct 2010
Posts: 1
Location: Shropshire

 Posted: Thu Oct 21, 2010 1:34 pm    Post subject: Mechanics As Physics Help Please :) In designing a supermarket there is sometimes a need for connecting ramps between different parts of the shop. It is decided to limit the push required to push a 24kg trolley to less than 25N. What is the maximum angle at which the ramp can be built? My Solution: W=235N p>25N Therefore P(Max)=24.9N Sin(A)= 24.9/235 (A) = sin-1 24.9/235 Therefore (A) = 6 degrees Correct? Help much appreciated
hepcj

Joined: 23 Jun 2007
Posts: 125

 Posted: Thu Oct 21, 2010 4:49 pm    Post subject: Your method seems okay but I would question the idea that because the force has to be less than 25 N, it is 24.9 N. Why not 24.99 N or 24.999 N and so on? The conclusion is that you can take the force as being exactly 25 N, not that it will affect the result by much. The answer 6 deg seems reasonable.
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