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प्रश्न
Is energy a vector quantity?
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उत्तर
No, energy is a scalar quantity as it has only magnitude.
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संबंधित प्रश्न
A body falls freely under gravity from rest. Name the kind of energy it will possess while falling.
Show that the sum of kinetic energy and potential energy (i.e., total mechanical energy) is always conserved in the case of a freely falling body under gravity (with air resistance neglected) from a height h by finding it when
- The body is at the top.
- the body has fallen a distance x.
- the body has reached the ground.
A stone of mass 500 g is thrown vertically upwards with a velocity of 15 m/s. Calculate:
- the potential energy at the greatest height,
- the kinetic energy on reaching the ground, and
- the total energy at its half-way point.
What type of energy is possessed : by the piece of stone which is thrown away on releasing the stretched rubber strings of catapult?
A boy weighing 40 kg makes a high jump of 1.5 m.
What is his potential energy at the highest point? (g = 10 m/s2)
A stone is thrown upwards as shown in the diagram. When it reaches P, which of the following has the greatest value of the stone?
Name the device or machine which convert :
Electrical energy into heat energy.
Name the device or machine which convert :
Chemical energy into heat energy.
The hanging bob of a simple pendulum is displaced to one extreme position B and then released. It swings towards centre position A and then to the other extreme position C. In which position does the bob have :
(i) maximum potential energy?
(ii) maximum kinetic energy?
Name the energy transfers which occur when an electric ball rings.
