An automobile is moving at `100 kmph` and is exerting attractive force of `3920 N`. What horse power nust the engine develop, if `20 %` of the power developed is wasted ?

A force of 200N is required to move a body with a velocity of 20 ms. The power developed is :

An automobile engine develops 100 kW when rotating at a speed of 1800 rev//min . What torque does it deliver ?

An automobiles engine develops a power of 100 kilowatt, when rotating at a speed of 30 rev/sec. What torque does it deliver?

An engine is hauling a train of mass m on a level track at a constant speed v . The resistance due to friction is f . What power is the engine producing? What extra power must the engine develop to maintain the speed up a gradient 1 in l. What is the new total power developed by the engine develop to maintain the speed up a gradient 1 in l. What is the new total power developed by the engine ?