Advertisements
Advertisements
प्रश्न
Calculate the amount of work done by a child carrying a bag of 20 kg when he moves a distance of 40 m in
(a) Vertical direction, and
(b) Horizontal direction
Advertisements
उत्तर
Given, mass = 20kg
displacement = 40m
(a) In vertical direction work is done against gravity
Work done = mgh = 20 x 9.8 x 40 = 7840J
(b) In horizontal direction
Work done = Fs cos0 = (mg)s cos 0° = 20 x 9.8 x 40 = 7840J
APPEARS IN
संबंधित प्रश्न
Write the expression for work done by a force.
Fill in the blank with suitable word :
1 joule is the work done when a force of 1 __________ moves an object through a distance of one __________ in the direction of __________.
Does the earth move around the sun with a uniform velocity?
Complete the following sentences:
The SI unit of work is ....... and of power is .......
Name the CGS unit of work.
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 stone dropped from the top of a cliff reaches the ground after some time.
Look at the activity below. Reason out whether or not work is done in the light of your understanding of the term ‘work’.
Food grains are getting dried in the sun.
