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777dan777 [17]
3 years ago
10

An automotive air conditioner produces a 1-kW cooling effect while consuming 0.75 kW of power. What is the rate at which heat is

rejected from this air conditioner
Physics
1 answer:
Ipatiy [6.2K]3 years ago
8 0

Answer:

The rejected by the air conditioning system is 1.75 kilowatts.

Explanation:

A air conditioning system is a refrigeration cycle, whose receives heat from cold reservoir with the help of power input before releasing it to hot reservoir. The First Law of Thermodynamics describes the model:

\dot Q_{L} + \dot W - \dot Q_{H} = 0

Where:

\dot Q_{L} - Heat rate from cold reservoir, measured in kilowatts.

\dot Q_{H} - Heat rate liberated to the hot reservoir, measured in kilowatts.

\dot W - Power input, measured in kilowatts.

The heat rejected is now cleared:

\dot Q_{H} = \dot Q_{L} + \dot W

If \dot Q_{L} = 1\,kW and \dot W = 0.75\,kW, then:

\dot Q_{H} = 1\,kW + 0.75\,kW

\dot Q_{H} = 1.75\,kW

The rejected by the air conditioning system is 1.75 kilowatts.

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Determine the volume of a cube whose width is 32.1 cm. Round your answer to the correct number significant figures.
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Plugging the data of the problem, L=32.1 cm, inside the equation, we find the volume:

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3 years ago
A 75.0 kg diver falls from rest into a swimming pool from a height of 5.10 m. It takes 1.34 s for the diver to stop after enteri
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Answer:

559.5 N

Explanation:

Applying,

v² = u²+2gs............. Equation 1

Where v = final velocity,

From the question,

Given: s = 5.10 m, u = 0 m/s ( from rest)

Constant: 9.8 m/s²

Therefore,

v² = 0²+2×9.8×5.1

v² = 99.96

v = √(99.96)

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Apply

a = (v-u)/t

a = 9.99/1.34

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Given: m = 75 kg, a = -7.46 m/s²,

F = 75(-7.46)

F = -559.5 N

Hence the average force exerted on the diver is 559.5 N

7 0
3 years ago
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