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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 pair of bullocks exerts a force of 140 N on a plough. The field being ploughed is 15 m long. How much work is done in ploughing the length of the field?
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Define 1 joule of work.
Explain by an example that a body may possess energy even when it is not in motion.
Name five appliances or machines which use an electric motor.
Determine the amount of work done when an object is displaced at an angle of 30° with respect to the direction of the applied force.
Define 'joule'.
No work is done by a man moving on a horizontal road while carrying a box on his head. Explain.
A force can cause an object to change its ______.
