Advertisements
Advertisements
प्रश्न
In loading a truck, a man lifts boxes of 100 N each through a height of 1.5 m.
How much energy is transferred when one box is lifted?
Advertisements
उत्तर
The work done against gravity is stored in the box in the form of potential energy. So, energy transferred when one box is lifted is 150 J
APPEARS IN
संबंधित प्रश्न
Define 1 watt of power.
A lamp consumes 1000 J of electrical energy in 10 s. What is its power?
What is the work done by the force of gravity on a satellite moving round the earth? Justify your answer.
An electric heater is rated 1500 W. How much energy does it use in 10 hours?
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)
Define kilowatt-hour.
What is the power of a body which is doing work at the rate of one joule per second?
A man weighing 500 N carried a load of 100 N up a flight of stairs 4 m high in 5 seconds. What is the power?
In loading a truck, a man lifts boxes of 100 N each through a height of 1.5 m.
If the man lifts 4 boxes per minute, at what power is he working?
(g = 10 m s−2)
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)
