Question: An initially stationary box of sand is to be pulled across a floor by means of a cable in which the tension should not exceed 1100 N. The coefficient of static friction between the box and the floor is 0.35.(adsbygoogle = window.adsbygoogle || []).push({});

a) what should be the angle between the cable and the horizontal in order to pull the greatest possible amount of sand?

b)What is the weight of the sand and box in that situation?

My solution that gives me the 'incorrect' answer:

Eqn 1--> Tcos(theta) - u(static coefficient)F(normal)=0

Equation 2--> Force Normal + tsin(theta) - mg=0

I can solve for the force normal to be equal to = mg/1.35

For there i assumed that the angle should be 45 degrees (i know..wrong assumption) but have no clue what to do next....

any help would be appreciated

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# Homework Help: Friction related problem

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