**The tune-up specifications of a car call for the spark plugs to be tightened to a torque of 35 Nm. **

**You plan to tighten the plugs by pulling on the end of a**

*21*-cm-long wrench.**Because of the cramped space under the hood, you’ll need to pull at an angle of**

*125***°**

**with respect to the wrench shaft.**

**With what force must you pull?**

**Known variables:**

**Torque(τ): **35 Nm

**position r relative to its axis of rotation:** 21 cm or

**.21m**

**Angle: 125 °**

To find the Force, you would need to derive from the torque equation.

τ = Frsinθ

Just solve for F, if you rearrange the equation, it would look a little something like this.

F= τ/rsinθ

F= 35/.21( sin(125) )

F= 203 N or200 N (two significant figures)

**F=** 200 N

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