Newtonmeters

The driver loosened the nut on the car wheel with a wrench that held 20 cm from the axis of the bolt. He acted on the key with a force of 320N. At what moment did he act on the bolt?

Correct answer:

M =  64 Nm

Step-by-step explanation:

$$\begin{gathered} r=20\text{cm}\to \text{m}=20:100\text{m}=0.2\text{m} \\ F=320\text{N} \\ M=F\cdot r=320\cdot 0.2=64\text{Nm} \end{gathered}$$

Try another example