Advertisements
Advertisements
प्रश्न
Define 1 J of work.
उत्तर
1 J is the amount of work done by a force of 1 N on an object that displaces it through a distance of 1 m in the direction of the applied force.
APPEARS IN
संबंधित प्रश्न
A pair of bullocks exerts a force of 140 N on a plough. The field being ploughed is 15 m long. How much work is done in ploughing the length of the field?
Look at the activity below. Reason out whether or not work is done in the light of your understanding of the term ‘work’.
A sailboat is moving due to wind energy.
Explain briefly why the work done by a fielder when he takes a catch in a cricket match is negative.
What is the work done by the moon when it revolves around the earth?
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.
Write the formula for work done on a body when the body moves at an angle to the direction of force. Give the meaning of each symbol used.
What should be the angle between the direction of force and the direction of motion of a body so that the work done is zero?
Choose one or more correct alternatives.
For work to be performed, energy must be ______.
- transferred from one place to another
- concentrated
- transformed from one type to another
- destroyed
What is the relationship between Nm and dyne cm?
Write an expression for work done by a force depends?
A woman pulls a bucket of water of total mass 5 kg from a well which is 10 s. calculate the power used by her.
How fast should a boy weighting 30 kg run so that his kinetic energy is 375 joule?
A body of mass 60 kg has the momentum 3000 kgm/s-1. Calculate: the speed of 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?
An electric motor pump is 60% efficient and is rated 2.5 H.P. Calculate the maximum load it can lift through a height of 10m in 8 sec. (1 H.P. = 750 W).
________ is said to be done when a force is acting on it.
Look at the activity below. Reason out whether or not work is done in the light of your understanding of the term ‘work’.
A donkey is carrying a load on its back.
A body of mass 0.5 kg travels on straight line path with velocity v = (3x2 + 4) m/s. The net work done by the force during its displacement from x = 0 tox = 2 m is ______.
