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Mechanics As Physics Help Please :)

 
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cocopops93



Joined: 21 Oct 2010
Posts: 1
Location: Shropshire

PostPosted: Thu Oct 21, 2010 1:34 pm    Post subject: Mechanics As Physics Help Please :) Reply with quote

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 Smile
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hepcj
Site Admin


Joined: 23 Jun 2007
Posts: 125

PostPosted: Thu Oct 21, 2010 4:49 pm    Post subject: Reply with quote

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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