Advertisements
Advertisements
Question
A car of weight 20000 N climbs up a hill at a steady speed of 8 m/s, gaining a height of 120 m is 100 s. Calculate : power of engine of car.
Advertisements
Solution
Now, we can calculate the power of the body as,
Power = `"Work done"/"Time"`
So ,
Power = `2400000/100` W
= 24 kW
So, the power of car is 24 kW.
APPEARS IN
RELATED QUESTIONS
Calculate the work done by the brakes of a car of mass 1000 kg when its speed is reduced from 20 m/s to 10 m/s?
A body of mass 100 kg is lifted up by 10 m. Find :
(i) the amount of work done
(ii) potential energy of the body at that height (value of g = 10 m/s2)
Name the physical quantity whose unit is watt.
Fill in the blanks with suitable words :
One watt is a rate of working of one ___________ per ___________.
The power output of an engine is 3kW. How much work does the engine do in 20 s?
Define power. Give the SI unit of power.
A boy weighing 40 kg carries a box weighing 20 kg to the top of a building 15 m high in 25 seconds. Calculate the power. (g = 10 m/s2)
In loading a truck, a man lifts boxes of 100 N each through a height of 1.5 m.
How much work does he do in lifting one box?
Which one of the following statements about power stations is not true?
How is the power related to the speed at which a body can be lifted? How many kilograms will a man working at the power of 100 W, be able to lift at a constant speed of 1 m s–1 vertically? (g = 10 m s–2)
