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

An engine lifts 200kg of metal to a vertical height of 30 m in one minute.Find the horsepower of the engine.

The angle of elevation of an aeroplane from a point A on the ground is 60^@ . After a flight' of 30 seconds, the angle of elevation changes to 30^@ . If the plane is flying at a constant height of 3600sqrt3 m , find the speed of the plane in km/hour.

The power of awater pump is 2 kw.If g=10 ms^-1 the amount of water it can raise to a height of 10 m in minute is

The length of one diagonal of a parallelogram is 86 m. and length of the perpendicular drawn from any one of the remaining vertices to the diagonal is 36 m. Find the area of the parallelogram.

The angle of elevation of the top of a temple from a point in the same horizontal plane is 30^@ .When observed from another point which is 150m straight ahead of the original point on the same plane,the angle of elevation of the top of the temple was 60^@ .Find the height of the temple.

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 man in a boat moving away from a light house 100m high takes 2 minutes to change the angle of elevation of the top of light house from 60° to 30°,find the speed of the boat.

The angle of elevation of the top of a temple when observed from a point on the horizontal line through the foot of the temple is found to be 30^@ .By advancing 200m towards the temple the angle of elevation of the top of the temple is found to be 60^@ .Find the height of the temple.

A tower makes an angle of 60^@ at a point P lying in the same plane. From a point Q which is at a vertical distance of 10m from P, the angle of depression of the floor of the tower is 30^@ .Find the height of the tower.

A circus artist is climbing a 20 m long rope.which is tightly stretched and tied from the top of a vertical pole to the ground.Find the height of the pole,if the angle made by the rope with the ground level is 30^@ (see Fig 9.11)