Advertisements
Advertisements
प्रश्न
State the S.I. unit of energy.
State the SI unit of electrical energy.
Advertisements
उत्तर
Joule (J)
APPEARS IN
संबंधित प्रश्न
No work is done by a force if the body
Define the term energy.
A force of 30 N acts on a body and moves it through a distance of 5 m in the direction of force. Calculate the work done by the force.
A water pump raises 50 litres of water through a height of 25 m in 5 s. Calculate the power of the pump required.
(Take g = 10 N kg-1 and density of water = 1000 kg m-3)
What are the units of (a) work, and (b) energy?
Give one example in which a force does zero work.
The velocity of a car increases from 54 km/hr to 72 km/hr. How much is the work done if the mass of the car is 1500 kg?
What is the work done against gravity when a body is moved horizontally along a frictionless surface?
What do you mean by a kilo joule?
Write an expression for work done by a force depends?
State the energy changes which take place when An electric bulb glows when it is connected to a source of electric current.
State the energy changes which take place when A piece of magnesium wire is burnt in a jar of oxygen.
A force is applied on a body of mass 20 kg moving with a velocity of 40 ms−1. The body attains a velocity of 50 ms−1 in 2 seconds. Calculate the work done by the body.
A girl of mass 40 kg runs a height of 80 stairs, each 25 cm high with a load of 20 kg on her head in 25 sec. If g is 10 m/s2, find:
(i) Gravitational force acting on the girl.
(ii) Work done by her.
(iii) Useful work done by her.
(iv) Her power in watt.
What is power? How do you differentiate kilowatt from kilowatt-hour? The Jog Falls in Karnataka state are nearly 20 m high. 2000 tonnes of waterfalls from it in a minute. Calculate the equivalent power if all this energy can be utilized? (g = 10 m s–2)
