A car mechanic is attempting to undo a wheel nut. He exerts a force on the end of a spanner (wrench) at right-angles to the spanner. Which method gives the greatest turning effect on the nut?
- Aapplying double the force to a spanner that is half as long
- Bapplying double the force to a spanner that is twice as long
- Capplying double the force to the same spanner
- Dapplying the same force to a spanner that is twice as long