QUESTION ANSWER
1:-What is gravitional energy? Explain with an example.
2:- Explain the change in energy of falling water in a hydro-electric power station.
3:- How is the potential energy of a raised hammer different from the potential energy of a stretched bow?
4:- How can you prove that the sun is the biggest source of all energies?
Answers
Answer:
4.Sunlight is used in photosynthesis. Solar energy is used to ccok food in solar cooker. It is also used solar cell which is converted to electrical energy, on which many electrical appliances can work. It is also green source of energy. 2.The flowing water has kinetic energy and this flowing water turns the turbine of the generator which generates electricity in hydro electric power plant. Thus the kinetic energy of flowing water is converted to electrical energy
Explanation:
1.the energy stored in an object due to its position above the Earth's surface is called gravitational potential energy. This energy is due to the force of gravity acting on an object. EP=mgh. When a stone falls from a height then potential energy is converted to kinetic energy when it comes on the surface of earth.
Answer:
1. The energy by which two object attracts each because of their mass is known as Gravitational Energy. e.g gravity is responsible for maintaining the position of planets in our solar system.
4. Sun is the biggest source of all energy because it provide sunlight by which plants make their food and produce oxygen in our environment. If sunlight not not been there then there would be no oxygen no oxygen means no life and no life means no production of energy. Hence sun is the main source of energy.