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3 years ago

PLEASE HELP SOME1 Smart!

Physics

1 answer:

tester [92]3 years ago

5 0

Answer:

=>. 45°

=>. both angle are equal

=> because it is law of reflection

=> angle of incidence = angle of reflection

hope it helps

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What is the total entropy change if a 0.280 efficiency engine takes 3.78E3 J of heat from a 3.50E2 degC reservoir and exhausts i

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Answer:

$\Delta S=1.69J/K$

Explanation:

We know,

$\eta=1-\frac{T_2}{T_1}=1-\frac{Q_2}{Q_1}$ ..............(1)

where,

η = Efficiency of the engine

T₁ = Initial Temperature

T₂ = Final Temperature

Q₁ = Heat available initially

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Given:

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$0.28=1-\frac{Q_2}{3.78\times 10^{3}}$

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$Q_2=3.78\times 10^3\times0.72$

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Now,

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$\Delta S=\frac{\Delta Q}{T_1}$

$\Delta S=\frac{Q_1-Q_2}{T_1}$

substituting the values in the above equation we get

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Answer:

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