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FAQs on DC Pandey Solutions (JEE Main): Work, Energy and Power - DC Pandey Solutions for JEE Physics

1. What is the definition of work in physics?
Ans. In physics, work is defined as the transfer of energy that occurs when a force is applied to an object and displaces it in the direction of the force. Mathematically, work is calculated using the formula: Work = Force x Displacement x cos(angle between the force and displacement).
2. What is the unit of work and energy in the International System of Units (SI)?
Ans. The unit of work and energy in the SI system is the joule (J). One joule is equal to the work done when a force of one newton is applied to an object and moves it one meter in the direction of the force.
3. How is power defined in physics?
Ans. Power is defined as the rate at which work is done or energy is transferred. Mathematically, power is calculated using the formula: Power = Work / Time. The SI unit of power is the watt (W), where one watt is equal to one joule per second.
4. What is the principle of conservation of energy?
Ans. The principle of conservation of energy states that energy cannot be created or destroyed, but it can only be transferred or transformed from one form to another. This means that the total energy of a system remains constant, even though it may change from one form to another.
5. How can we calculate the gravitational potential energy of an object?
Ans. The gravitational potential energy of an object is calculated using the formula: Gravitational Potential Energy = mass x acceleration due to gravity x height. Here, the acceleration due to gravity is approximately 9.8 m/s^2 on the surface of the Earth.
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