Advertisements
Advertisements
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?
Advertisements
उत्तर
Given: Force F = 140N
Displacement s = 15m
Work done = Force × Displacement
W = F × s
W = 140N × 15m
= 2100 Nm
= 2100 J
Work done in the end = 2100 J
Hence, 2100 J of work is done in ploughing the length of the field.
APPEARS IN
संबंधित प्रश्न
When do we say that work is done?
Soni says that the acceleration in an object could be zero even when several forces are acting on it. Do you agree with her? Why?
.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.
State two disadvantages of producing hydroelectricity.
In case of negative work, the angle between the force and displacement is :
Name the material commonly used for the manufacturing of solar cells.
What is work?
A man squatting on the ground gets straight up and stand. The force of reaction of ground on the man during the process is ______.
State whether work is done or not, by writing yes or no, in the following case:
A boy climbs up 20 stairs.
