English

Ravi applied a force of 10 N and moved a book 30 cm in the direction of the force. How much was the work done by Ravi? - Science and Technology

Advertisements
Advertisements

Question

Ravi applied a force of 10 N and moved a book 30 cm in the direction of the force. How much was the work done by Ravi?

Numerical
Advertisements

Solution

Given:

Force (F) = 10 N,

Displacement (s) = 30 cm

= 30 × 102 m

Find: Work done (W) = ?

Formula: W = F × s

Calculations:

W = 10 × 30 × 10−2 

W = `(10 xx 30)/100`

W = 3 J

Work done by Ravi is 3 J.

shaalaa.com
  Is there an error in this question or solution?
Chapter 2: Work and Energy - Exercises [Page 29]

APPEARS IN

Balbharati Science and Technology [English] 9 Standard Maharashtra State Board
Chapter 2 Work and Energy
Exercises | Q 5. e. | Page 29

RELATED QUESTIONS

The S.I. unit of work is


State two conditions when no work is done by a force.


A boy of weight 40 kgf climbs up the 15 steps, each 15 cm high in 10 s and a girl of weight 20 kgf does the same in 5 s. Compare:

  1. the work done, and
  2. the power developed by them. Take g = 10 N kg-1.

How much work is done when a body of mass m is raised to a height h above the ground?


Give one example each in which a force does (a) positive work (b) negative work, and (c) zero work.


A girl is carrying a school bag of 3 kg mass on her back and moves 200 m on a levelled road. If the value of g be 10 m/s2, the work done by the girl against the gravitational force will be :


Name five appliances or machines which use an electric motor.


Give two examples of couple action in our daily life.


What are the quantities on which the work done depends?

What is the work done on a body by the gravitational force towards the centre of the path acting when it moves along a circular path?

Is power a scalar quantity?


A weight lifted a load of 200 kgf to a height of 2.5 m in 5 s. calculate: (i) the work done, and (ii) the power developed by him. Take g= 10 N kg-1.


A body is thrown vertically upwards. Its velocity keeps on changing. What happens to its K.E. when does its velocity become zero?

What is meant by power?

If an electric bulb of 100 watt is lighted for 2 hours, how much electric energy would be consumed?


Fill in the boxe to show the corresponding energy transformation.


Give an example 
Chemical energy changes to heat energy.


What should be the characteristic of a source of energy?


A is a push or a pull ______.


A car is accelerated on a levelled road and attains a velocity 4 times of its initial velocity. In this process the potential energy of the car


Share
Notifications

Englishहिंदीमराठी


      Forgot password?
Use app×