Advertisements
Advertisements
प्रश्न
A machine raises a load of 750 N through a height of 16 m in 5 s. calculate:
- energy spent by machine,
- power at which the machine works.
Advertisements
उत्तर
- Energy spent by machine or work done = F × S
Work, W = 750 × 16 = 12000J - Power spent = `"work done"/"time taken " = "12000j"/"5s" = 2400 "w"`
APPEARS IN
संबंधित प्रश्न
In each of the following a force, F is acting on an object of mass, m. The direction of displacement is from west to east, as shown by the longer arrow. Observe the diagrams carefully and state whether the work done by the force is negative, positive or zero.
State two disadvantages of producing hydroelectricity.
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.
Name the type of energy possessed by a
(i) stretched catapult (ii) hot iron
(iii) wound up clock
Give an example
Chemical energy changes to electrical energy.
The work done by the heart is 1 Joule per beat. Calculate the power of the heart if it beats 72 times in one
A man squatting on the ground gets straight up and stand. The force of reaction of ground on the man during the process is ______.
