(a(i))[1]
Define power.
(a(ii))[1]
Define Young modulus.
(b(i).1)[2]
Use the Young Modulus of the steel to show that the cable tension is $3.1 \times 10^{4}\,\text{N}$.
(b(i).2)[3]
Calculate the acceleration of the mass while it is being lifted from the ground.
(b(ii).1)[1]
The motor now raises the mass through a height of $15\,\text{m}$ at a constant speed. Calculate the tension in the lifting cable.
(b(ii).2)[2]
Calculate the increase in potential energy of the mass.
(b(iii))[3]
The crane’s motor is $30\%$ efficient. Calculate the input power needed for the motor to lift the mass at a constant speed of $0.55\,\text{m s}^{-1}$.