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3 years ago

Which of the following statements are true?

Physics

1 answer:

Likurg_2 [28]3 years ago

4 0

Answer:

Explanation:

(A) True: It is true.

In junction law, the current entering at a junction is equal to teh current leaving at the junction.

(B) False: It is false.

The kirchhoff's junction law is based on the conservation of charge.

Energy is used in the circuit.

(D) True: It is true.

It is based on the conservation of charge.

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An engine has an energy input of 125 J, and 35 J of that energy is transformed into useful energy. What is the efficiency of the

xeze [42]

The efficiency of the engine at the given useful energy and input energy is 28%.

The given parameters:

<em>Input energy of the engine, = 125 J</em>
<em>Useful energy of the engine, 35 J</em>

The efficiency of the engine is defined as the ratio of the output energy (useful energy) to the input energy and it is calculated as follows;

$efficiency\ = \frac{0ut put \ energy}{1nput \ energy} \times \ 100\%\\\\efficiency\ = \frac{35}{125} \times 100\%\\\\efficiency\ = 28 \ \%$

Thus, the efficiency of the engine at the given useful energy and input energy is 28%.

Learn more about efficiency of engine here: brainly.com/question/6751595

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2 years ago

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3 years ago

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okay so i already answered this question A. what is the density of an 84.7g sample of an unknown substance if the sample occupie

Lera25 [3.4K]

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d = 84.7 g / 46.7 cm³ = 7.75 g / x cm³
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3 years ago

Lead hs a density of 11.3 g/cm3 and a mass of 282.5 g . what is its volume?

JulsSmile [24]

D = m / V

11.3 = 282.5 / V

V = 282.5 / 11.3

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4 years ago