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nataly862011 [7]
2 years ago
9

You have a source of energy containing 21 gj of energy at 600k how much this energy can be converted to work when rejecting heat

to the atmosphere at 27°C?
Physics
1 answer:
sweet [91]2 years ago
4 0

Answer:

Available energy = 35 x 10⁶ J

Explanation:

Given:

Amount of energy (Q) = 21 gj = 21 x 10⁹ J

Temperature T1 = 600 k

Temperature T0 = 27 + 273 = 300k

Find:

Available energy

Computation:

Available energy = Q[1/T0 - 1/T1]

Available energy = 21 x 10⁹ J[1/300 - 1/600]

Available energy = 35 x 10⁶ J

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An electric motor does 900j of work for 8 hours. Calculate the power used​
nataly862011 [7]

Answer:

0.031 W

Explanation:

The power used is equal to the rate of work done:

P=\frac{W}{t}

where

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t is the time taken to do the work W

In this problem, we have:

W = 900 J is the work done by the motor

t = 8 h is the time taken

We have to convert the time into SI units; keeping in mind that

1 hour = 3600 s

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t=8\cdot 3600 =28,800 s

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Which of the following is an example of the conclusion phase of the scientific method?
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a scientist examines the results and answers the lab question- last choice

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Which variety of moth, C or Y, is more likely to be killed by insect eating birds?
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Which of these atoms is the most electronegative? select one: a. si b. cl c. p d. f e. c
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The atom that is the most electronegative is fluorine (F).

<h3>What is electronegative?</h3>

Electronegativity, is the tendency for an atom of a given chemical element to attract shared electrons when forming a chemical bond.

Electronegativity increases across the groups from left to right of the periodic table and decreases down the group.

Examples of electronegative elements arranged in decreasing order;

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Thus,  the atom that is the most electronegative is fluorine (F).

Learn more about electronegativity here: brainly.com/question/24977425

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