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Arlecino [84]
3 years ago
9

Your boss tells you that she needs a decision by the end of the day about the machine you want to purchase for your new operatio

n. You have four options, and your boss reminds you to be as cost-efficient as possible but that she also wants the best efficiency. Which is your best option?
Option 1: This $5,000 machine is supplied energy at a rate of 1,900 W and does useful work at a rate of 1,786 W.
Option 2: This $4,500 machine is supplied energy at a rate of 1,450 W and does useful work at a rate of 1,300 W.
Option 3: This $4,750 machine is supplied energy at a rate of 1950 W and does useful work at a rate of 1833 W.
Option 4: This $4,750 machine is supplied energy at a rate of 2,000 W and does useful work at a rate of 1,822 W.

    
  A. Option 4
  B. Option 3
  C. Option 1
  D. Option 2
Physics
2 answers:
Dvinal [7]3 years ago
6 0
It might be B. Option 3
KatRina [158]3 years ago
4 0

Explanation:

It is given that, your boss tells you that she needs a decision by the end of the day about the machine you want to purchase for your new operation.

Option 1.

This $5,000 machine is supplied energy at a rate of 1,900 W and does useful work at a rate of 1,786 W.

Efficiency = (output power/ input power) × 100

Here, output power is 1786 W and input power is 1900 W

So, \eta=\dfrac{1786}{1900}\times 100=94\%

Option 2.

This $4,500 machine is supplied energy at a rate of 1,450 W and does useful work at a rate of 1,300 W.

Efficiency = (output power/ input power) × 100

Here, output power is 1300 W and input power is 1450 W

So, \eta=\dfrac{1300}{1450}\times 100=89\%

Option 3.

This $4,750 machine is supplied energy at a rate of 1950 W and does useful work at a rate of 1833 W.

Efficiency = (output power/ input power) × 100

Here, output power is 1833 W and input power is 1950 W

So, \eta=\dfrac{1833}{1950}\times 100=94\%

Option 4.

This $4,750 machine is supplied energy at a rate of 2,000 W and does useful work at a rate of 1,822 W.

Efficiency = (output power/ input power) × 100

Here, output power is 1822 W and input power is 2000 W

So, \eta=\dfrac{1822}{2000}\times 100=91.1\%

Since, both option (3) and (1) is 94 % but in option (c) the cost is less and is giving maximum efficiency. So, the correct option is (b) " option 3."

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Vlada [557]

Answer: The work done in J is 324

Explanation:

To calculate the amount of work done for an isothermal process is given by the equation:

W=-P\Delta V=-P(V_2-V_1)

W = amount of work done = ?

P = pressure = 732 torr = 0.96 atm    (760torr =1atm)

V_1 = initial volume = 5.68 L

V_2 = final volume = 2.35  L

Putting values in above equation, we get:

W=-0.96atm\times (2.35-5.68)L=3.20L.atm

To convert this into joules, we use the conversion factor:

1L.atm=101.33J

So, 3.20L.atm=3.20\times 101.3=324J

The positive sign indicates the work is done on the system

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3 years ago
-Plz Help Meh-<br> Calculate the acceleration of a car if the force is 450N and the mass is 1300kg.
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Answer:

Explanation:

F=Ma

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4 0
2 years ago
The capacitance of a fully-charged capacitor is 11 F. Determine the capacitor's capacitance when it is half charged.
Tcecarenko [31]

Answer:

The capacitance is 11 F for half and fully charged capacitor.

Explanation:

Capacitance of capacitor is given by the expression

             C=\frac{\epsilon A}{d}

Where ε is the  vacuum permittivity, A is the area of plates and d is the separation between plates.

So capacitance does not depend upon charge and potential. So capacitance fully and half charged capacitors are same.

Here the capacitance is 11 F for half and fully charged capacitor.

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We define the specific heat of a material as the energy that must be transferred to 1.0 kg of that material in order to cause it
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Answer:

No change in the specific heat.

Explanation:

Specific heat is an intrinsic property that it has not depend upon on the amount of substance or energy added, it depends upon the material.

So, when twice the amount of energy is transferred, specific heat of the material does not change rather the energy that is twice in the amount to 1 kg of that material cause it to warm 2.0° C.

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Three magnets are placed on a plastic stick as shown in the image. Explain how the magnets need to be rearranged so that they st
dimaraw [331]

Answer:

The magnets need to be placed with red closest to blue.

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Explanation:

6 0
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