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3 years ago

Help me asap I rely need help u will be my fav

Engineering

2 answers:

Nonamiya [84]3 years ago

5 0

The answer is C!!!!!!!!!

sladkih [1.3K]3 years ago

3 0

Answer:

The Answer is C!

Explanation:

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A completely reversible heat pump produces heat at a rate of 300 kW to warm a house maintained at 24 °C. The exterior air, which

trapecia [35]

Answer:

No.

Explanation:

The Coefficient of Performance of the reversible heat pump is determined by the Carnot's cycle:

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

$COP_{HP} = \frac{297.15\,K}{297.15\,K-280.15\,K}$

$COP_{HP} = 3.339$

The power required to make the heat pump working is:

$\dot W = \frac{300\,kW}{3.339}$

$\dot W = 89.847\,kW$

The heat absorbed from the exterior air is:

$\dot Q_{L} = 300\,kW - 89.847\,kW$

$\dot Q_{L} = 210.153\,kW$

According to the Second Law of Thermodynamics, the entropy generation rate in a reversible cycle must be zero. The formula for the heat pump is:

$\frac{\dot Q_{L}}{T_{L}} - \frac{\dot Q_{H}}{T_{H}} + \dot S_{gen} = 0$

$\dot S_{gen} = \frac{\dot Q_{H}}{T_{H}} - \frac{\dot Q_{L}}{T_{L}}$

$\dot S_{gen} = \frac{300\,kW}{297.15\,K}-\frac{210.153\,kW}{280.15\,K}$

$\dot S_{gen} = 0.259\,\frac{kW}{K}$

Which contradicts the reversibility criterion according to the Second Law of Thermodynamics.

5 0

3 years ago

Which of the following is a valid statement about a resume ?

PolarNik [594]

Explanation:

I think it would be C but i dont know because i dont have the following question

4 0

3 years ago

Wassup everyone here is my question...

Varvara68 [4.7K]

Answer:

Step One: Know What Your Rocket Needs to Do. ...

Step Two: Establish Mission Parameters. ...

Step Three: Call in Experts. ...

Step Four: Start Drawing. ...

Step Five: Whittle Down the Possibilities. ...

Step Six: Pick the Best Design.

Explanation:

Hope this helps and thx for tha fwee pts

6 0

3 years ago

An ECG has a scalar magnitude of 1 mV on lead II and a scalar magnitude of 0.5 mV on lead III. Calculate the scalar magnitude on

s2008m [1.1K]

Answer: the scalar magnitude on lead I is 0.5 mV

Explanation:

Given that;

scalar magnitude on lead II = 1 mV

scalar magnitude on lead III = 0.5 mV

the scalar magnitude on lead I = ?

we know that;

Lead I Voltage = LA - RA -----------let this be equation 1

where LA is left arm electrode and RA is right am electrode

Also

Lead II = LL - RA

where LL is the left leg of electrode

we substitute

1 mV = LL - RA ---------------------let this be equation 2

Again

Lead III = LL - LA

we substitute

0.5 mV = LL - LA ------------------let this be equation 3

now subtract equation 3 and 2

1 mV - 0.5 mv = LL - RA - (LL - LA)

0.5 mV = LL - RA - LL + LA

0.5 mV = -RA + LA

0.5 mV = LA - RA

now taking a look at our equation 1 ( Lead I Voltage = LA - RA )

hence, Lead I Voltage = LA - RA = 0.5 mV

Therefore the scalar magnitude on lead I is 0.5 mV

3 0

3 years ago

Technician A says that empty hazardous waste drums may be disposed of in a public landfill.

zubka84 [21]

I think it would be B

7 0

2 years ago

Help me asap I rely need help u will be my fav​

Help me asap I rely need help u will be my fav