FreeNotes
An LED light bulb with an efficiency of 80% does not violate the principle of energy conservation. The law of conservation of energy states that energy cannot be created or destroyed, only transformed. In the case of an LED light bulb, 80% of the electrical energy is converted into useful light, while the remaining 20% … Read more
When a bullet is fired from a gun, its kinetic energy is initially high due to its velocity. Upon striking the sand wall, the bullet penetrates and eventually stops. The kinetic energy of the bullet is converted into several forms of energy. Primarily, it is transformed into heat energy, which is absorbed by the bullet, … Read more
Kinetic energy is proportional to the square of the velocity of an object. The formula for kinetic energy is given by Ek=1/2mv2, where m is the mass and v is the velocity. If the velocity of the car is doubled, the kinetic energy will increase by a factor of four. This is because (2v)2=4v2, so … Read more
Centripetal force does no work on an orbiting satellite. This is because work is only done when a force has a component in the direction of the displacement of the object. In the case of a satellite in orbit, the centripetal force acts perpendicular to the satellite’s direction of motion (which is tangential to its … Read more
The work done in raising a box depends on the height to which it is lifted and not on the speed at which it is raised. Work is defined as the product of the force applied to move an object and the distance over which it moves in the direction of that force. The force … Read more
When a car moves with a constant speed along a straight road, there is no work done on the car by the net force. According to the work-energy theorem, work is the product of force applied to an object and the displacement in the direction of the force. If the car’s speed is constant, there … Read more
Related Questions: Dynamics-1 Dynamics-II Pressure and Deformation in Solids Work and Energy Density and Temperature Magnetism What determines the validity of a theory? Which part of the study is not handled by the classical study of physics? Discuss the importance of physics in our daily life. Briefly discuss the importance of physics in other disciplines … Read more
Related Questions: Dynamics-1 Dynamics-II Pressure and Deformation in Solids Work and Energy Density and Temperature Q.7 Differentiate between Mechanical Stopwatch and Digital Stopwatch. Q.8 How measuring cylinder is used to measure the volume of an irregularly shaped stone? Q.9 What precautions should be kept in mind while taking measurements using a measuring cylinder? Q.10 Why … Read more
Related Questions: Dynamics-1 Dynamics-II Pressure and Deformation in Solids Work and Energy Magnetism Q.7 Differentiate between Mechanical Stopwatch and Digital Stopwatch. Q.8 How measuring cylinder is used to measure the volume of an irregularly shaped stone? Q.9 What precautions should be kept in mind while taking measurements using a measuring cylinder? Q.10 Why do we … Read more
Related Questions: Dynamics-1 Dynamics-II Pressure and Deformation in Solids Density and Temperature Magnetism Q.7 Differentiate between Mechanical Stopwatch and Digital Stopwatch. Q.8 How measuring cylinder is used to measure the volume of an irregularly shaped stone? Q.9 What precautions should be kept in mind while taking measurements using a measuring cylinder? Q.10 Why do we … Read more