# Problem: The tune-up specifications of a car call for the spark plugs to be tightened to a torque of 49. 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 120 with respect to the wrench shaft.With what force must you pull?

###### FREE Expert Solution

Torque:

$\overline{)\begin{array}{rcl}{\mathbf{\tau }}& {\mathbf{=}}& \mathbf{r}\mathbf{×}\mathbf{F}\\ {\mathbf{\tau }}& {\mathbf{=}}& \mathbf{r}\mathbf{F}\mathbf{s}\mathbf{i}\mathbf{n}\mathbf{\theta }\end{array}}$

93% (27 ratings) ###### Problem Details

The tune-up specifications of a car call for the spark plugs to be tightened to a torque of 49. 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 120 with respect to the wrench shaft.

With what force must you pull?

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Our tutors have indicated that to solve this problem you will need to apply the Intro to Torque concept. You can view video lessons to learn Intro to Torque. Or if you need more Intro to Torque practice, you can also practice Intro to Torque practice problems.