An automobil,e weighing 2000kg climbs up a hill that rises 1m in 20m of its lenth at the rate of 36 km/hr.Find the power developed by the engine.

A train 100 m long is moving with a velocity of 60 km/hr. Find the time it takes to cross the bridge 1km long.

A pump lifts 20 kg of water in one minute to a vertical height of 30m.Find the power of the pump.

A man cycles up a hill whoes slope is 1 m in 25 at the rate of 10 km/hr.the weight of the man and the cycle is 100 kg.Find the power at which he is working.

A box weighing 2 kg exerts a force of 20 N on the ground. The box covers an area of 2 sq. m on the ground. Find the pressure exerted by the box on the ground.

A brass wire 1.8 m long at 27^@C is held taut with little tension between two rigid supports. If the wire is cooled to a temperature of 39 ^@C , what is the tension developed in the wire, if its. diameter is 2.0 mm? Co-efficient of linear expansion of brass = 2.0 XX 10^-5 K^-1 Young’s modulus of brass = 0.91xx10^11 P

An engine of weight one metric ton is going up an inclined plane ,making an angle 30°with the horizental at the rate of 36 Km h^-1 .If the co-efficient of frinction is 0.6.calculate the power of engine in KW

A hoop of radius 2 m weighs 100 kg. It rolls along a horizontal floor so.that its centre of mass has a speed of 20 cm/s. How much work has to be done to stop it?

A disc of mass 5 kg radius 0.5 m rolls on the ground at the rate of 10 ms^(-1) . Calculate its KE.

A car weighs 1800 kg. The distance between its front and back axles is 1.8 m. its centre of gravity is 1.05 m behind the front axle. Determine the force exerted by the level ground on each front wheel and each back wheel.

A trolley of mass 200 kg moves with a uniform speed of 36 km/ h on a frictionless track. A child of mass 20 kg runs on the trolley from one end to the other (10 m away) with a speed of 4 m s^-1 relative to the trolley in a direction opposite to the its motion, and jumps out of the trolley. What is the final speed of the trolley? How much has the trolley moved from the time the child begins to run?