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melisa1 [442]
3 years ago
12

A pulley stems has an efficiency of 65.1%. If you perform 350 J of work, how much useful work does the pulley perform?

Physics
1 answer:
maria [59]3 years ago
3 0
<h3><u>Answer;</u></h3>

C. 228 Joules

<h3><u>Explanation;</u></h3>

<em><u>Efficiency of a machine is the energy or work output, divided by the energy or work input, and expressed as a percentage. </u></em> An ideal machine would have an efficiency of 100%.

Efficiency = (work output/work input) × 100%

work input = 350 joules, efficiency = 65.1%

Work output = 350 j × 65.1/100

                    = 227.85

                    <u>≈ 228 Joules</u>

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Explanation:

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They propagate at different speeds through a vacuum depending on their frequency.

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All the above phenomena are due the electromagnetic wave spectrum. Electromagnetic waves travel at a constant speed of 3 x 10^8 m/s in a vacuum. Within the spectrum, the different types of electromagnetic waves exists in different band range of frequencies and wavelengths unique to each of the waves, and the energy they carry. When these waves enter a non-vacuum medium, their speed change, depending on the nature of the material of the medium, and the frequency or the wavelength of the incoming wave.

5 0
4 years ago
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7 0
3 years ago
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vladimir1956 [14]
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8 0
2 years ago
I have a bottle of gas, the bottle can expand and contract. Initially the gas is at 1 kpa of pressure and a volume of 1 Liter, a
drek231 [11]

Answer:

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