3 years ago

The goal of a command enconomy is to

Engineering

1 answer:

Svetllana [295]3 years ago

5 0

Answer:

manage country economies in which is help responsible by a government in place.

Explanation:

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abrir candados y abrir puertas

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2 years ago

In a photonic material, signal transmission occurs by which of the following? a)- Electrons b)- Photons

fredd [130]

B. Photons.

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3 years ago

A heat pump receives heat from a lake that has an average wintertime temperature of 6o C and supplies heat into a house having a

Dafna1 [17]

Answer:

a) $\dot W = 1.062\,kW$

Explanation:

a) Let consider that heat pump is reversible, so that the Coefficient of Performance is:

$COP_{HP} = \frac{T_{H}}{T_{H}-T_{L}}$

$COP_{HP} = \frac{298.15\,K}{298.15\,K-279.15\,K}$

$COP_{HP} = 15.692$

The minimum heat received by the house must be equal to the heat lost to keep the average temperature constant. Hence:

$\dot Q_{H} = 60000\,\frac{kJ}{h}$

The minimum power supplied to the heat pump is:

$\dot W = \frac{\dot Q_{H}}{COP}$

$\dot W = \frac{\left(60000\,\frac{kJ}{h} \right)\cdot \left(\frac{1\,h}{3600\,s} \right)}{15.692}$

$\dot W = 1.062\,kW$

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3 years ago

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xenn [34]

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True

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