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प्रश्न
The S.I. unit of work is
विकल्प
second
metre
joule
newton
उत्तर
joule
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संबंधित प्रश्न
State the S.I. unit of work and define it.
Differentiate between energy and power.
State the energy transformation on the following:
Electricity is obtained from solar energy.
When is the work done by a force on a body : (a) positive, (b) negative, and (c) zero?
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?
State the conditions of equilibrium for a rigid body.
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Can work done be zero even if force acts on the body?
A coolie, with a load of 30 kg on his head, walks on the platform. If he walks a distance of 60 m, what is the work done by him?
A man climbs a slope and another walks same distance on level road. Which of the two expends more energy and why?
Name two places in India where electricity is generated from nuclear power plants.
Explain, why submarines are able to dive underwater as well as a sail on the surface of the water?
(i) A 200g ball is thrown vertically upward with an initial velocity of 30 ms-1. Draw a velocity-time graph for the motion of ball.
(ii) How long will the ball take to reach the highest point?
(iii) What will be the kinetic energy of ball, when it returns to the starting point, neglecting the air resistance?
(iv) What will be the potential energy of ball at highest point?
Force acting on a particle moving in a straight line varies with the velocity of the particle v as F = `K/v`, where K is a constant. The work done by this force in time t is
