Advertisements
Advertisements
प्रश्न
In case of negative work, the angle between the force and displacement is :
पर्याय
0°
45°
90°
180°
उत्तर
Work done is negative when the direction of force is opposite to the direction of motion. So, the angle between force and displacement in the case of negative work is .
Therefore, the answer is, (d) 180°
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?
Explain briefly why the work done by a fielder when he takes a catch in a cricket match is negative.
State two conditions when no work is done by a force.
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.
.A man raises a box of mass 50kg to a height of 2m in 20s, while another man raises the same box to the same height in 50s. Compare:
(i) the work done, and
(ii) the power developed by them.
Fill in the blank with suitable word :
Work is measured as a product of __________ and __________
Define the term 'work'. Write the formula for the work done on a body when a force acts on the body in the direction of its displacement. Give the meaning of each symbol which occurs in the formula.
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 :
The work done on an object does not depend on the :
What is meant by a translational motion? Give one example.
State the conditions of equilibrium for a rigid body.
Does the earth move around the sun with a uniform velocity?
Is work done a scalar or a vector physical quantity?
A man carrying a suitcase in his hand is walking horizontally. What is the work done against gravity?
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.
Fill in the boxe to show the corresponding energy transformation.
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 ______.
