Energy is conserved this means that in any system _____

Asked by admin @ 07/11/2021 in Physics viewed by 273 People

Must the total energy of a system be conserved whenever its momentum is conserved? Explain why or why not.

Answered by admin @ 07/11/2021

It depends on the type of momentum that is being considered when making the calculations. Generally when the external force acting on the system is zero - there are no external influences - there is a conservation of the momentum of the system. This is appreciated with greater amount, when considering an elastic system, for which the momentum of the system and the kinetic energy are conserved.

However, in inelastic collisions, the momentum is usually conserved but the kinetic energy is not. This happens because the system can transfer the kinetic energy in other types of energy to its surroundings such as thermal energy for example. This causes that energy in the system to decrease.

Therefore energy is not always conserved when the momentum is conserved.

A hair dryer with a resistance of 9.6 ohms operates at 120 volts for 2.5 minutes. the total electrical energy used by the dryer during this time interval is

Asked by maham237 @ 13/01/2021 in Physics viewed by 1200 persons

Mind map for light reflection and refraction class 10

Asked by admin @ 23/08/2021 in Physics viewed by 1142 persons

The african cicada is the world's loudest insect, producing a sound intensity level of 107 db at a distance of 0.50 m. what is the intensity of its sound (in w/m2) as heard by someone standing 3.1 m away? express your answer in watts per meter squared.

Asked by maham237 @ 10/01/2021 in Physics viewed by 1095 persons

A thief runs at a speed of 10m s

Asked by admin @ 23/08/2021 in Physics viewed by 1095 persons

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Asked by maham237 @ 20/06/2021 in Physics viewed by 1077 persons

Energy is conserved this means that in any system _____

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