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barxatty [35]
2 years ago
14

Calculate the efficiency of a light bulb that gives 40J of light from 200J of electrical energy’s

Physics
1 answer:
nekit [7.7K]2 years ago
7 0

Answer:

This formula is the most common one used. The efficiency is in a %

20%

Explanation:

Efficiency = energy out / energy in * 100 (for a %)

Efficiency = 40 / 200 * 100

Efficiency = 20%

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Kinetic energy = momentum^2 / 2 x mass
Mass = (momentum^2/ Kinetic energy) / 2

Mass =  (25^2 / 275) / 2
Mass = 1.136 kg.

momentum = mass x velocity

velocity = mass / momentum
velocity = 1.136 / 25
velocity = 0.04544 m/s
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3 years ago
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3 years ago
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Detergents are special, powerful cleansers that can break up dirt, oils, and grease in clothing or on dishes.

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3 years ago
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