Question

You are installing a new spark plug in your car, and the manual specifies that it be tightened to a torque that has a magnitude of 97 N·m. Using the data in the figure, determine the magnitude F of the force that you must exert on the wrench.

Answer 1

We are given 

the torque requirement of 97 Newton meter. 

The formula of the torque is

τ = r * F * sinθ

where 

τ is the torque
r = radius from the axis of rotation to the point of application. 
F = force exerted 
θ = the angle between the lever arm and the radius

Try to substitute the given and solve for F.