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Ksenya-84 [330]
4 years ago
15

An engineer devises a scheme for extracting some power from waste process steam. The engineer claims that the steam enters the d

evice at 340 F and quality 75%, and exits at 220 F and 65% quality.
Does this device violate the first law of thermodynamics?
Engineering
1 answer:
loris [4]4 years ago
4 0

Answer:

This device does not violate the first law of thermodynamics

Explanation:

First law of thermodynamics states that  any change in the internal energy (∆E) of a system is given by the sum of the heat (q) that flows across its boundaries and the work (w) done on the system by the surroundings:

i.e (∆E)= q + w

The operation of the device is coherent with the first law of thermodynamics because the work extracted from the steam causes a drop in the internal energy and quality of the steam. This is reflected by the drop in temperature which is from 340 F to 220 F.

This drop in temperature and quality shows that work is extracted from the total energy of the system, proving that the device obeys the first law of thermodynamics.

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If you detect that something’s wrong while lowering a lift, you should try to get the vehicle down as fast as possible
Rashid [163]
False, it depends on the situation. If the lift is tilting or anything like I would then get down. Certain training will say to get out and see if you can keep lowering,
4 0
3 years ago
An uncharged capacitor is connected to a resistor and a battery. Choose what happens to current, potential difference and charge
Ilya [14]

Answer:

  • The charge on the plates will increase with time
  • The potential difference across the capacitor starts with zero and then increases gradually to a maximum value
  • The current through the circuit starts high and then drops exponentially

Explanation:

<u>Case : An uncharged capacitor is connected to a resistor and a battery in a closed circuit.</u>

  • The charge on the plates will increase with time

applying this equation : Q = Q_{0}  [ 1 - e^{\frac{-t}{RC} } ]  as the value of (t) increases the value of Q increases i.e. charge on the plates

  • The potential difference across the capacitor starts with zero and then increases gradually to a maximum value

applying this equation : V = V_{0}  [ 1 - e^{\frac{-t}{RC} } ]

  • The current through the circuit starts high and then drops exponentially

current : I = I_{0}  e^{\frac{-t}{RC} }

6 0
3 years ago
Assume, X Company Limited (XCL) is one of the leading 4th generation Life Insurance
marishachu [46]

Answer:

The issues related to the privacy are:

1. Informational privacy

2. Discrimination factors

3. Biased grouping on the basis of Data mining

4. Lack of consent

5. Morally wrong

6. Illegal distribution of information risks

7. Possibility of threat to life

Let's look at some major concerns:

1. Informational privacy : The concept of privacy of the personal information is totally nullified when the information is being used for a purpose other than the intended one for which it was given. This unethical use of information even for general purposes is not correct and is a matter of concern. It is more like using the sensitive data of others for personal benefit which is purely objectionable and raises security issues. Sometimes the data is also shared with the potential employers which might have certain impacts we are unaware of.

2. Data mining issues : The process of using a certain information to arrive and understand the trend and outcomes is called data mining. In this case, the consumer's data undergoes grouping and might get placed in the wrong group rather than the actual one. Also, there can be a case of biasing towards the groups which are not be focused on, or are not a part of the intended audience. This leads to the discrimination factors if we see it from a social point of view.

3. Lack of consent : Use of information without the consent or awareness of the consumers raises concern over the business ethics followed by the company. No one deserves the right to misuse information for his personal benefits without any of its information to the consumer. It is morally wrong and againt the work ethics. Moreover, it raises trust issues between the two involved, and hence is socially unacceptable.

3 0
4 years ago
Read 2 more answers
A powerful contribution of the 1st and 2nd laws is to determine the design feasibility of a process/device/system. Please determ
Sladkaya [172]

Answer:

Detailed step wise solution is given below:

6 0
3 years ago
A lake is fed by a polluted stream and a sewage outfall. The stream and sewage wastes have a decay rate coefficient (k) of 0.5/d
joja [24]

Solution :

Given :

k = 0.5 per day

$C_s = 10 \ mg/L \ ; \ \ Q_s= 40 \ m^3/s$

$C_{sw} = 100 \ ppm \ ; \ \ Q_{sw}= 0.5 \ m^3/s$

Volume, V $= 200 \ m^3$

Now, input rate = output rate + KCV ------------- (1)

Input rate  $= Q_s C_s + Q_{sw}C_{sw}$

                $=(40 \times 10) + (0.5\times 100)$

                $= 2 \times 10^5 \ mg/s$

The output rate $= Q_m C_{m}$

                          = ( 40 + 0.5 ) x C x 1000

                          $=40.5 \times 10^3 \ C \ mg/s$

Decay rate = KCV

∴$KCV =\frac{0.5/d \times C \  \times 200 \times 1000}{24 \times 3600}$

            = 1.16 C mg/s

Substituting all values in (1)

$2 \times 10^5 = 40.5 \times 10^3 \ C+ 1.16 C$

C = 4.93 mg/L

4 0
3 years ago
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