More energy is spent in climbing stairs because the person works against gravity. When climbing stairs, the person must lift their body mass upward, opposing the force of gravity. This requires expending energy to overcome gravity’s resistance, making the task ...
Tiwari Academy Discussion Latest Questions
When the speed of a moving object doubles, its kinetic energy quadruples. Kinetic energy is directly proportional to the square of the velocity according to the kinetic energy formula. Therefore, when the speed doubles, the kinetic energy increases by a ...
The drawn bow does not have kinetic energy. Kinetic energy is the energy possessed by an object due to its motion. While the other options involve objects in motion—fired bullet, flowing water, and moving hammer—the drawn bow is not in ...
Found in a substance like a rubber mattress when its shape changes, stored energy refers to the potential energy stored within the material due to deformation. This stored energy enables the material to return to its original shape once the ...
Electrical energy is produced by converting solar energy using photovoltaic cells. Photovoltaic cells directly convert sunlight into electricity through the photovoltaic effect. When sunlight hits the cells, it excites electrons, generating a flow of electricity.
Dynamo converts mechanical energy into electrical energy. Rotating coils within a magnetic field induce an electromotive force, generating electrical current. This process is based on electromagnetic induction.
Energy is produced in the Sun by nuclear fusion. In the Sun’s core, hydrogen nuclei fuse to form helium nuclei, releasing immense amounts of energy in the process. This fusion reaction powers the Sun and generates the heat and light ...
Food gets cooked in less time in a pressure cooker because high pressure increases the temperature of boiling water. The elevated pressure inside the cooker raises the boiling point of water, allowing food to cook at higher temperatures, thereby reducing ...
A rubber balloon filled with hydrogen bursts when it goes up in the air because air pressure decreases. As the balloon ascends, the surrounding air pressure decreases. The pressure inside the balloon remains constant, causing the balloon to expand until ...
Before flight, the airplane is run on the runway to reduce the friction force between the ground by the aircraft. This allows the aircraft to accelerate smoothly, overcoming inertia, and reach the necessary takeoff speed, ensuring a safe and efficient ...