मराठी
सी.आई.एस.सी.ई.आयसीएसई ICSE Class 8

A body when acted upon by a force of 10 kgf moves to a distance 0.5 m in the direction of force.Find the work done by the force. Take 1 kgf = 10 N. - Physics

Advertisements
Advertisements

प्रश्न

A body, when acted upon by a force of 10 kgf, moves to a distance 0.5 m in the direction of force. Find the work done by the force. Take 1 kgf = 10 N.

बेरीज

उत्तर

F= 10 kgf = 10 × 10N= 100 N,
Displacement S = 0.5 m
Work done
(i) When displacement is in the direction of force
W = F × S
W= 100 × 0.5 = 50 J

shaalaa.com
  या प्रश्नात किंवा उत्तरात काही त्रुटी आहे का?
पाठ 4: Energy - Numericals [पृष्ठ ७८]

APPEARS IN

सेलिना Concise Physics [English] Class 8 ICSE
पाठ 4 Energy
Numericals | Q 3 | पृष्ठ ७८

संबंधित प्रश्‍न

What is the work done by the moon when it revolves around the earth?


Work done by a boy depends on the time in which he does work.


Give reasons for the following A teacher moving around in the class is doing work but a child standing and reading a book is not doing any work.


A bullet of mass 0.5 kg slows down from a speed of 5 m s-1 to that of 3 m s-1. Calculate the change in kinetic energy of the ball.


What is the work done against gravity when a body is moved horizontally along a frictionless surface?


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.


When do we say that work is done? Write the formula for the work done by a body in moving up against gravity. Give the meaning of each symbol which occurs in it.


Name five appliances or machines which use an electric motor.


Give two examples of work done.


Can we destroy every energy associated with a body?

A 100 W electric lamp emits energy in the form of light at the rate 10 J per second. What percentage of electric energy does the lamp transform into light energy?


Define energy and state the unit of energy and the law of conservation of energy.


A girl of mass 50 kg runs up a flight of 40 steps in 20 seconds. If each step in 20 cm high, calculate the power developed by the girl. (g= 10 ms-2).


Fill in the boxe to show the corresponding energy transformation.


Fill in the boxe to show the corresponding energy transformation.


Give an example

Light energy changes to electrical energy.


In the following case write yes, if the work is being done and no if no work is being done.

A boy climbing up a staircase.


Is power a scalar or a vector quantity?


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)


A proton is kept at rest. A positively charged particle is released from rest at a distance d in its field. Consider two experiments; one in which the charged particle is also a proton and in another, a positron. In the same time t, the work done on the two moving charged particles is ______.


Share
Notifications

Englishहिंदीमराठी


      Forgot password?
Use app×