Chapter 4
Newton's Three Laws

Solution 19

(a) Looking at the forces parallel to the plane and Newton's Second Law we know that there is constant velocity so the acceleration is zero.

solving for the frictional force:

Now we need to look at the forces on the dills.

and solving for the tension T:

We have two equations with two unknowns and solving by substitution.

(b) We need to look at the normal force so that we can find the frictional force.

solving for N:

Putting this into the friction equation and solving for the the coefficient of friction.

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