An elevator weighing 500 kg is to be lifted up at a constant velociyt of 0.20 m/s. What would be the minimum horsepower of the motor to be used?

A lift weighing 250 kg is to be lifted up at a constant velocity of 0.20 m. What would be the minimum horse power of the motor to be used ?

An elevatore weighinig 500kg is to be lifted up at a constant velocity of 0*4m//s . What should be the minimum horse power of the motor to be used ?

A lift weighing 900 kg is to be lifted at a constant speed of 0.5 m/s. What shoud be the horse power of the motor used for running the lift? [Use g=10m//s^(2) and 1 Horse power =750 watt]

In a factor it is desired to lift 2000 kg of metal through a distance of 12 m in 1 minute. Find the minimum horsepower of the engine to be used.

In a factory it is desired to lift 746 kg of metal through a distance of 60 m is 1 min. The minimum horsepower of the engine to be used will be

A motor is to be used to lift water from a depth of 10 m & discharging it on ground level at a speed 10m//s if 2 kg of water is lifted per second & the efficiency of motor is 40% The minimum power of the motor should be nearly :

(a) A rocket set for vertical firing weighs 50kg and contains 450kg of fuel. It can have a maximum exhaust velocity of 2km//s . What should be its minimum rate of fuel consumption (i) to just lift off the launching pad? (ii) to give it an initial acceleration of 20m//s^2 ? (b) What will be the speed of the rocket when the rate of consumption of fuel is 10kg//s after whole of the fuel is consumed? (Take g=9.8m//s^2 )

Ten litre of water per second is lifted from well through 20m and delivered with a velocity of 10 m/s, then the power of the motor is :

In unloading grain from the hold of a ship, an elevator lifts the grian through a distance of 12 m. Grain is discharged at the top of the elevator at a rate of 2 kg each second and the discharge speed of each of grain particle is 3 ms^(-1) . Find the minimum horsepower of the motor that can elevate grain in this way. (Take g=10 ms^(-2) )