Advertisements
Advertisements
प्रश्न
A machine raises a load of 750 N through a height of 16 m in 5s. calculate:
(i) work done by machine,
(ii) power at which the machine works.
Advertisements
उत्तर
Given, load m = 750 N, displacement h = 16 m, time = 5 s, g = 10 N kg -1
now work done = mgh = 750 x 16 = 12000J
or power = `"work done"/"time taken" = 12000/5` = 2400 watt
APPEARS IN
संबंधित प्रश्न
A girl weighing 400 N climbs a vertical ladder. If the value of g be 10 m s−2, the work by her after climbing 2 m will be :
Choose one or more correct alternatives.
Joule is the unit of ______.
- force
- work
- power
- energy
Name the physical quantity whose SI unit is Nm.
Why does a spanner have a long handle?
On what factors does the work done by a force depend?
A block of mass 20 kg is pulled up a slope (fig.12) with a constant speed by applying a force of 500 N parallel to the slope. A and B are initial and final positions of the block.
(a) Calculate the work done by the force in moving the block from A and B.
(b) Calculate the potential energy gained by the block.
A man climbs a slope and another walks same distance on level road. Which of the two expends more energy and why?
