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3 years ago

Would it be easier to pull the tablecloth out from under a glass of water or an

1 answer:

3 0

Glass as it is heavier and by newtons first law and inertia the greater the mass = more inertia(resistance to chabge in motion) thus the glass has a greater mass than an empty paper cup and thus has greater inertia. So it would be easier to leave it in place

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Ammonia enters the compressor of an industrial refrigeration plant at 2 bar, −10°C with a mass flow rate of 15 kg/min and is com

Juli2301 [7.4K]

Answer:

a) W=85.225 kW

b) $0.02\frac{kW}{K}$

Explanation:

First, consider the energy balance for the compressor: The energy that enters to the system (W and enthalpy of the feed flow) is equal to the energy that goes out from it (Heat Q and enthalpy of the exit flow):

$W+m*h_1=Q+m*h_2\\W=Q+m*(h_2-h_1)$

Consider the enthalpy data from van Wylen 6th edition, Table B.2.2. According to that, $h_1=h(200kPa,-10C)=1440.6\frac{kJ}{kgK}$ , $h_2=h(1200kPa,140C)=1757.5\frac{kJ}{kgK}$

So, the power input to the compressor is:

$W=6kW+15\frac{kg}{min}*\frac{min}{60s}*(1757.5-1440.6)\frac{kJ}{kg}\\W=85.225kW$

b) The differential entropy change dS for a reversible heat transfer dQ at a temperature T is:

$dS=\frac{dQ}{T}$

This equation can be integrated if the heat transfer surface temperature remains constant, which is the case, giving as a result:

$S_2-S_1=\frac{Q}{T}=\frac{6kW}{300K}=0.02\frac{kW}{K}$

6 0

3 years ago

Help me answer this

liberstina [14]

no thanks your a fat h/o/e

7 0

3 years ago

Where is the electricity used at home generated?how dose it reach our house

andrew11 [14]

This is what I found

8 0

3 years ago

Name one advantage and one disadvantage of the prepaid electricity system.

Doss [256]

Answer:

The system prevents a consumer from accruing debt via electricity use, as it only allows the customer to use electricity which has been paid for upfront.

this gives the advantage of not allowing the consumer to rack up debt

the disadvantage for the consumer comes when they cannot afford to prepay in a time of financial difficulty - as the system now renders them as having no electricity as well as no money

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3 years ago

Diego is playing basketball. While running at 7 km/h toward a basketball hoop, he throws the ball at the net. The ball travels a

Tasya [4]

Hmm well best i can do is: 7 km/h + 20 km/h = 27 km/h. should be your answer.

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3 years ago

Read 2 more answers