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3 years ago

15

Air conditioners are rated by their coefficient of performance at 61 ∘ F inside temperature and 99 ∘ F outside temperature. An e

fficient but realistic air conditioner has a coefficient of performance of 3.2. What is the maximum possible coefficient performance?

1 answer:

vovikov84 [41]3 years ago

6 0

Answer:

the maximum possible coefficient performance is 13.7

Explanation:

inside temperature, $T_{C}$ = 61 F = 289.26 K

outside temperature, $T_{H}$ = 99 F = 310.37 K

coefficient of performance, COP (real) = 3.2

according to Carnot's theorem, the coefficient of performance is

$COP_{max}$ = $\frac{T_{C} }{T_{H}-x_{C} }$

where

$T_{C}$ is cold temperature

$T_{H}$ is hot temperature

thus,

$COP_{max}$ = $\frac{289.26}{310.37-289.26}$

= 13.7

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All we need to do now is substitute the values in

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2 years ago

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As we know that

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2 years ago

A ray of light incident in water strikes the surface separating water from air making an angle of 10 ° with the normal to the su

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Answer:

a

$\theta _2 = 13^o$

b

$\theta _1 =32.94^o$

c

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Explanation:

From the question we are told that

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Generally Snell's law is mathematically represented as

$n_1 sin(\theta_1) = n_2 sin(\theta_ 2)$

Here $n_2$ is the refractive index of air with value $n_2 = 1$

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Given that the angle should not be greater than $\theta _2 =45^o$ then the angle of incidence will be

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=> $\theta _1 = sin^{-1}[\frac{1 * sin(45)}{1.3} ]$

=> $\theta _1 =32.94^o$

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