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# help with this mechanics question!!! Watch

1. this is a question out of the AQA mechanics book. No one in my class or teachers can get the answer in the back of the book so please have a go and post method and answer.
Here is the question:
A sledge of mass 16kg is being pulled up the side of a hill of inclination 25 degrees, at a constant velocity. The coefficient of friction between the sledge and hill is 0.4, and the rope pulling the sledge exerts a force of magnitude T N at 15 degrees to the hill.
Find the magnitude of the tension in the rope??

The answer in the back of the book is 115N, however no one in my class or any of the maths or physics teachers could get this. Please help
2. I get 115N

If you post some working I will see where you have gone wrong

Or, alternatively Undead Cat will break the rules and give you the solution
3. (Original post by Undead Cat)
...
The forum rules are clear ... we are asked not to provide solutions

Thanks
4. I get 115.

This is a standard slope question: resolve forces parallel and perpendicular to the slope.

You will then have two equations with two unknowns, T and R. Eliminate R and the rest should be clear.

Please always show us some working, preferably with a nice diagram. It is often the case that people misinterpret the instructions of the question. If we know where you are going wrong then we can point you in the right direction.

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Updated: April 18, 2013
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