Why the axis of rotation is changed when torque is applied

The distance from the pivot point to the point where the force acts is called the moment arm, and is denoted by 'r'.

Explanation:

Note that this distance, 'r', is also a vector, and points from the axis of rotation to the point where the force acts. (Refer to Figure 1 for a pictoral representation of these definitions.)

c. magnitude and direction

the temperature in kelvin of 2.0 dm3 of an ideal gas is doubled and its pressure is increased by a factor of four. what is the final volume of the gas