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प्रश्न
Explain, why submarines are able to dive underwater as well as a sail on the surface of the water?
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उत्तर
Submarines are provided with ballast tanks. When required to dive, the water is allowed to enter the tanks. And when required to sail, the water is forced out by compressed air.
Work is a scalar quantity.
संबंधित 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.
What happens to the work done when the dispacement of body is at right angles to the direction of force acting on it? Explain your answer.
A force of 50 N acts on a body and moves it a distance of 4 m on horizontal surface. Calculate the work done if the direction of force is at an angle of 60° to the horizontal surface.
Write an expression for the work done against gravity.
Fill in the boxe to show the corresponding energy transformation.
State larger units of power.
