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प्रश्न
State the S.I. unit of work and define it.
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उत्तर
S.I. unit of work is Joule
Joule “Is that much work done when a force of IN displaces the body through a distance of lm in the direction of the force.”
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संबंधित प्रश्न
The S.I. unit of work is
What is the condition for a force to do work on a body?
How much work is done when a force of 2 N moves a body through a distance of 10 cm in the direction of force?
Choose one or more correct alternatives.
Joule is the unit of ______.
- force
- work
- power
- energy
Draw a neat labeled diagram to show the direction of two forces acting on a body to produce rotation in it. Also mark the point about which rotation takes place.
A body of mass 60 kg has the momentum 3000 kgm/s-1. Calculate: the speed of the body.
Explain, why submarines are able to dive underwater as well as a sail on the surface of the water?
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?
Write the two main conditions are needed for work to be done?
