Advertisements
Advertisements
प्रश्न
A load of 100 kg is pulled up by 5 m. Calculate the work done. (g = 9.8 m/s2)
Advertisements
उत्तर
Mass of the body (m) = 100 kg
Height by which the body is lifted (h) = 5 m
Work done in lifting a body = (Weight of body) (Vertical distance)
So, W = (m) (g) (h)
Therefore,
(W) = (100) (9.8) (5) J .
= 4900 J
So , the work done is 4900 J .
APPEARS IN
संबंधित प्रश्न
What is power?
Define average power.
A battery lights a bulb. Describe the energy changes involved in the process.
Define kilowatt-hour.
Name the physical quantity whose unit is watt.
The power output of an engine is 3kW. How much work does the engine do in 20 s?
An electric heater uses 600 kJ of electrical energy in 5 minutes. Calculate its power rating.
Define power. Give the SI unit of power.
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)
