The unit of moment of a couple can be expressed in?

A gramophone record takes 5s to reach its constant angular velocity of 4\(\pi\) rads^-1 from rest. Find its constant angular acceleration.

A car of mass 1500 kg goes round a circular curve of radius 50m at a speed of 40 ms^-1. The magnitude of the centripetal force on the car is ?

Two spheres of masses 5.0 kg and 10.0 kg are 0.3 m apart. Calculate the force of attraction between them?


[G = 6.67 X 10^-11 Nm² Kg²]

A machine has a velocity ratio of 4. if it requires 800 N to overcome a load of 1600 N,what is the efficiency of the machine?