Advertisements
Advertisements
प्रश्न
A force of 30 N acts on a body and moves it through a distance of 5 m in the direction of force. Calculate the work done by the force.
Advertisements
उत्तर
F = 30 N
d= 5m
Work done = w = F × d
W = 30 × 5= 150 J
APPEARS IN
संबंधित प्रश्न
What do you mean by degradation of energy?
Name five appliances or machines which use an electric motor.
What is meant by a translational motion? Give one example.
Complete the following sentences:
Kilowatt is the unit of ....... and kWh is the unit of
Can work done be zero even if force acts on the body?
How is horse power related to the S. I. unit of power?
Define Translational motion.
A truck driver can load oil drums into the back of the truck by pushing them up a sloping plank, or by lifting them directly. Each drum has a mass of 80 kg, the plank is 3 m long, and the back of the truck is 0.8 m above the ground.
(i) How much force would be needed to lift a drum into the truck directly/without using the plank? (Take g = 10 m/s2)
(ii) How much energy would be required in lifting the drum into the truck without the plank?
(iii) If the force needed to push the drum up the plank is 300 N, why is this less than the answer to part (i)?
(iv) When the truck is loaded, the driver drives off. List the major energy changes that take place in moving the truck.
(v) The driver has to stop at the factory gates. What happens to the kinetic energy of the truck?
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 ______.
