A torque wrench is a type of spanner for tightening a nut and bolt to a particular torque, as illustrated below.
The wrench is put on the nut and a force is applied to the handle. A scale indicates the torque applied.
The wheel nuts on a particular car must be tightened to a torque of 
. This is achieved by applying a force 
to the wrench at a distance of 
from its centre of rotation C. This force may be applied at any angle 
to the axis of the handle, as shown above.
For the minimum value of to achieve this torque,
state the magnitude of the angle that should be used.
calculate the magnitude of .
.
.
