A thermos flask prevents heat loss through all three mechanisms by using a vacuum to stop conduction and convection and a reflective coating on the inner surfaces to minimize radiation, thereby maintaining the temperature of the contents.
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The use of hydraulic brakes in automatic vehicles is a direct application of Pascal’s law. Pascal’s law states that pressure exerted at any point in a confined fluid is transmitted undiminished throughout the fluid in all directions, enabling the effective ...
The rule that validates the statement that matter can neither be created nor destroyed is the law of conservation of mass. This principle states that the total mass of a closed system remains constant over time, regardless of any physical ...
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 ...
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 ...