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Aleks04 [339]
4 years ago
13

A NATO base in northern Norway is warmed with a heat pump that uses 7.0 °C ocean water as the cold reservoir. Heat extracted fro

m the ocean water warms fluid to 80°C; this warmed fluid is used to heat the building. When the system is working at full capacity, 2,000 kW of heat is delivered to the building at the cost of 600 kW of electric energy. a. What is the actual coefficient of performance of the system? b. What is the theoretical maximum coefficient of performance of the system?
Physics
1 answer:
tatiyna4 years ago
3 0

Answer:

3.33, 4.84

Explanation:

A) Actual coefficient of performance can be calculated by the formula stated below

Actual COP = heat delivered/ work required

Actual COP = 2,000/600

Actual COP = 3.33

B) Th = High temperature = 80°C + 273 = 353K

Tl = Low temperature = 7°C + 273 = 280K

The theoretical maximum coefficient of performance can ve calculated by the formula

Theoretical COP = Th/(Th-Tl)

Theoretical COP = 353/(353-280)

Theoretical COP = 353/73

Theoretical COP = 4.84

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The total momentum of Elena and Madison is equal to the algebraic sum of their momenta; taking into account the correct signs, we have:

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4. 0.72 m/s to the left

We can find the final speed of Elena and Madison by using the law of conservation of momentum. In fact, the final momentum must be equal to the initial momentum (before the collision).

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v=\frac{p_i}{m_e + m_m}=\frac{-90.5 kg m/s}{60.0 kg+65.0 kg}=-0.72 m/s

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