3 years ago

Pick the best description of energy efficiency?

1 answer:

8 0

The answer is B. Efficiency is equal to the ratio of energy you get out (output) to the energy you put in (input). Say for a basic example you got a converted output of 40W from 50W input, you'll have an efficiency of 80 percent only.

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If the half life of an isotope is 20 years, how much of the original amount will

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Answer:

Half

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A string of 26 identical Christmas tree lights are connected in series to a 120 V source. The string dissipates 73 W. What is th

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To solve this problem we will apply the concepts related to Ohm's law and Electric Power. By Ohm's law we know that resistance is equivalent to,

$R_{eq}= \frac{V}{I}$

Here,

V = Voltage

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While the power is equivalent to the product between the current and the voltage, thus solving for the current we have,

$P=VI \rightarrow I = \frac{P}{V}$

$I =0.608 A$

Applying Ohm's law

$R_{eq} = \frac{120V}{0.608A}$

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Therefore the equivalent resistance of the light string is $197.4\Omega$

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Use v=fλ
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Does the diagram show a spring or neap tide?How do you know?

vampirchik [111]

It shows a neap tide

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Incident rays parallel to the axis of a concave mirror reflect parallel to the axis.

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No they don't. Incident rays parallel to the axis of a concave mirror
reflect from the mirror's surface and converge at its focal point.

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