Advertisements
Advertisements
Question
State the S.I. unit of work and define it.
Solution
S.I. unit of work is Joule
Joule “Is that much work done when a force of IN displaces the body through a distance of lm in the direction of the force.”
APPEARS IN
RELATED QUESTIONS
When does a force perform work?
Define the term energy.
In which of the following cases, is work being done?
(i) A man pushing a wall.
(ii) a coolie standing with a load of 12 kgf on his head.
(iii) A boy climbing up a staircase.
Find the kinetic energy of a body of mass 1 kg moving with a uniform velocity of 10 m s-1.
State two advantage of producing hydroelectricity.
Explain degradation of energy by taking two examples of your daily life.
Give one example each in which a force does (a) positive work (b) negative work, and (c) zero work.
If the work done by a force in moving an object through a distance of 20 cm is 24.2 J, what is the magnitude of the force?
Explain by an example that a body may possess energy even when it is not in motion.
A car is being driven by a force of 2.5 ✕ 1010 N. Travelling at a constant speed of 5 m/s, it takes 2 minutes to reach a certain place. Calculate the work done.
Name five appliances or machines which use an electric motor.
No work is done by a man moving on a horizontal road while carrying a box on his head. Explain.
State the energy changes which take place when A piece of magnesium wire is burnt in a jar of oxygen.
Give an example
Electrical energy changes of sound energy.
In the following case write yes, if the work is being done and no if no work is being done.
A coolie standing with a heavy load on his head
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)
