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Nesterboy [21]
3 years ago
13

How much time does it take a freezer to make a tray of ice cubes out of a tray of 0.25kg liquid water at 10 Celsius). Assume the

freezer is a constant cycle operating between-8(Celsius) and 35(Celsius) with a power requirement of 750 N. assume the liquid water is the only contents in the freezer
Engineering
1 answer:
natima [27]3 years ago
3 0

Answer:

time = 20.27 second

Explanation:

Given data

power = 750 N

ice cube = 0.25 kg

liquid water temp = 10°C

cycle operating = -8°C  to 35°C

to find out

required time

solution

we know that latent heat of water i.e. h(w) = 333 kJ/kg

and specific heat of water i.e S(p) = 4.187 kJ/kg

so we find first heat remove from water (Q)  i.e = mass (specific heat to water temp (10°C to  0°C) + latent heat of water)

so Q =  0.25 ( 4.187 (10°C -0°C ) + 333)

Q =  93.7175 kJ

in question we have given

Assume the freezer is a constant cycle operating so we consider here reversible carnot cycle

so Coefficient of Performance = desired effect / work input = heat absorbed  from evaporation / power

so here desire effect is 273 -8 = 265 and work input  is 35 - (-8) = 43

power is 0.75

so heat absorbed from evaporation = 265 / 43 × 0.75

heat absorbed from evaporation = 4.622 kJ/s

and we know heat absorbed from evaporation =  heat remove from water / time

so time will be 93.7175 / 4.622

time = 20.27 second

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8 0
3 years ago
It is appropriate to use the following yield or failure criterion for ductile materials (a) Maximum shear stress or Tresca crite
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Answer:

(b)Distortion energy theory.

Explanation:

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It states that maximum shear train energy per unit volume at any point  is equal to strain energy per unit volume under the state of uni axial stress condition.

But from these two Best theories ,suitable theory is distortion energy theory ,because it gives best suitable result for ductile material.

6 0
2 years ago
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8 0
3 years ago
The following are the results of a sieve analysis. U.S. sieve no. Mass of soil retained (g) 4 0 10 18.5 20 53.2 40 90.5 60 81.8
il63 [147K]

Answer:

a.)

US Sieve no.                         % finer (C₅ )

4                                                  100

10                                                95.61

20                                               82.98

40                                               61.50

60                                               42.08

100                                              20.19

200                                              6.3

Pan                                               0

b.) D10 = 0.12, D30 = 0.22, and D60 = 0.4

c.) Cu = 3.33

d.) Cc = 1

Explanation:

As given ,

US Sieve no.             Mass of soil retained (C₂ )

4                                            0

10                                          18.5

20                                         53.2

40                                         90.5

60                                         81.8

100                                        92.2

200                                       58.5

Pan                                        26.5

Now,

Total weight of the soil = w = 0 + 18.5 + 53.2 + 90.5 + 81.8 + 92.2 + 58.5 + 26.5 = 421.2 g

⇒ w = 421.2 g

As we know that ,

% Retained = C₃ = C₂×\frac{100}{w}

∴ we get

US Sieve no.               % retained (C₃ )               Cummulative % retained (C₄)

4                                            0                                           0

10                                          4.39                                      4.39

20                                         12.63                                     17.02

40                                         21.48                                     38.50

60                                         19.42                                     57.92

100                                        21.89                                     79.81

200                                       13.89                                     93.70

Pan                                        6.30                                      100

Now,

% finer = C₅ = 100 - C₄

∴ we get

US Sieve no.               Cummulative % retained (C₄)          % finer (C₅ )

4                                                     0                                          100

10                                                  4.39                                      95.61

20                                                 17.02                                     82.98

40                                                 38.50                                    61.50

60                                                 57.92                                    42.08

100                                                79.81                                     20.19

200                                                93.70                                   6.3

Pan                                                 100                                        0

The grain-size distribution is :

b.)

From the diagram , we can see that

D10 = 0.12

D30 = 0.22

D60 = 0.12

c.)

Uniformity Coefficient = Cu = \frac{D60}{D10}

⇒ Cu = \frac{0.4}{0.12} = 3.33

d.)

Coefficient of Graduation = Cc = \frac{D30^{2}}{D10 . D60}

⇒ Cc = \frac{0.22^{2}}{(0.4) . (0.12)} = 1

3 0
2 years ago
What is the single largest contributor to increasing takeoff or landing distance?
hodyreva [135]

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<h3>What is uphill slope?</h3>

Driving uphill suggests climbing a “positive” six percent slope . Driving downhill, the “rise” exists as a  drop, so there is a “negative,” or downhill, slope (Figure B). When dealing with slope, a positive slope simply indicates uphill and a negative slope indicates downhill. An uphill slope improves the take-off ground run, and a downhill slope increases the landing ground run.

If something or someone lives moving downhill or is downhill, they exist moving down a slope or are located toward the bottom of a hill. He headed downhill toward the river. adverb. If you communicate that something exists going downhill, you mean that it is becoming worse or less prosperous.

To learn more about uphill slope refer to:

brainly.com/question/13361896

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