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FAQs on DC Pandey Solutions (JEE Advance): 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 product of the force applied to an object and the distance over which the force is applied. It is given by the equation: Work = Force x Distance x cosθ, where θ is the angle between the force and the direction of motion.
2. How is energy related to work?
Ans. Energy and work are closely related. Work done on an object is equal to the change in its energy. When work is done on an object, energy is transferred to or from the object, resulting in a change in its energy. This can be seen through the work-energy theorem, which states that the work done on an object is equal to the change in its kinetic energy.
3. What is the difference between potential energy and kinetic energy?
Ans. Potential energy is the energy possessed by an object due to its position or state, while kinetic energy is the energy possessed by an object due to its motion. Potential energy can be further classified into gravitational potential energy and elastic potential energy, depending on the forces involved. Kinetic energy, on the other hand, depends on the mass and velocity of the object.
4. What is power in physics?
Ans. Power is the rate at which work is done or energy is transferred. It is defined as the work done or energy transferred per unit time. Mathematically, power is given by the equation: Power = Work/Time. The SI unit of power is Watt (W).
5. How can the conservation of mechanical energy be applied to solve problems in physics?
Ans. The conservation of mechanical energy states that the total mechanical energy of a system remains constant if no external work is done on the system. This principle can be applied to solve problems involving the interplay of potential and kinetic energy. By equating the initial and final mechanical energies of a system, one can determine unknown quantities such as velocities, heights, or distances traveled.
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