2 years ago

Why is the light bulb not a closed system?

1 answer:

4 0

Answer:An incandescent light bulb gives only energy of the system in the form of heat. ... The roof of a house is stable but it receives energy from the surroundings and transfers energy through it towards lower temperature side which includes no mass transfer. So, it is best considered as closed system.

Explanation:

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You hold a metal block of mass 40 kg above your head at a height of 2 m.

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Answer:

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Explanation:

Given:

Mass of the block is, $m=40\ kg$

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Now, work done by gravity is equal to the product of force of gravity and the distance moved in the direction of gravity. So,

$\textrm{Work by gravity}=F_g\times h$

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