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The tune-up specifications of a car call for the spark plugs to be tightened to a torque of 37 Nm. You plan to tighten the plugs by pulling on the end of a 28-cm-long wrench. Because of the cramped space under the hood, you'll need to pull at an angle of 115^circ with respect to the wrench shaft.With what force must you pull?

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Torque = F x R
37 = F x .28 sin(115)
37 = F x .28 x .9
F = 37/(28 x .9) = 37/.2537 = 145.8 N

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