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Moaveni - Energy, Environment, Sustainability 2/e (Homework)

James Finch

Engineering, section 1, Fall 2019

Instructor: Dr. Friendly

Current Score : 0 / 17

Due : Sunday, January 27, 2030 12:00 EST

Last Saved : n/a Saving...  ()

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0/1 0/1 0/2 –/3 –/2 –/1 –/2 –/2 –/1 –/2
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0/17 (0.0%)

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    This demo assignment allows many submissions and allows you to try another version of the same question for practice wherever the problem has randomized values.

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1. 0/1 points  |  Previous Answers MoaveniEES2 5.3.020. My Notes
Question Part
Points
Submissions Used
1
0/1
1/100
Total
0/1
 
  • This exercise will let students review and reference question concepts.
  • Read It links are available as a learning tool under each question so students can quickly jump to the corresponding section of the eTextbook.
  • Students get just-in-time learning support with Watch It videos that contain narrated and closed-captioned videos walking students through the proper steps to solve a similar problem.

Calculate the power requirement in horsepower for an escalator in a mall that transports 35 people with an average weight of 170 lbf (756 N) a vertical distance of 40 feet (12.2 m) in 31 seconds.
Incorrect: Your answer is incorrect.
Your response differs from the correct answer by more than 10%. Double check your calculations. hp

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2. 0/1 points  |  Previous Answers MoaveniEES2 5.4.019. My Notes
Question Part
Points
Submissions Used
1
0/1
1/100
Total
0/1
 
  • This exercise will let students review and reference question concepts.
  • Read It links are available as a learning tool under each question so students can quickly jump to the corresponding section of the eTextbook.
  • Students get just-in-time learning support with Watch It videos that contain narrated and closed-captioned videos walking students through the proper steps to solve a similar problem.

In colder climates, to keep a single family home warm and cozy during a cold winter day, you may need to generate as much as 46,000 British thermal units (Btu) of thermal energy per hour. Calculate the amount of natural gas (in ft3) that would be consumed by a furnace with an efficiency of 84% during a cold spell lasting five days. (One cubic foot of natural gas has an energy content of 1,000 Btu, or 1.05 ✕ 106 J.)
Incorrect: Your answer is incorrect.
Your response differs significantly from the correct answer. Rework your solution from the beginning and check each step carefully. ft3

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3. 0/2 points  |  Previous Answers MoaveniEES2 5.4.016. My Notes
Question Part
Points
Submissions Used
1 2
0/1 0/1
1/100 1/100
Total
0/2
 
  • This exercise will let students review and reference question concepts.
  • Read It links are available as a learning tool under each question so students can quickly jump to the corresponding section of the eTextbook.
  • Students get just-in-time learning support with Watch It videos that contain narrated and closed-captioned videos walking students through the proper steps to solve a similar problem.

Estimate the amount of fuel that could be saved annually if the efficiency of 29 million cars is increased by six percent. Assume an annual driving distance of 8,000 miles (12,880 km) and an average gasoline consumption of 25 miles per gallon (10.6 km/liter).
in millions of gallons Incorrect: Your answer is incorrect.
Your response differs significantly from the correct answer. Rework your solution from the beginning and check each step carefully. million gallons in millions of liters Incorrect: Your answer is incorrect.
Your response differs significantly from the correct answer. Rework your solution from the beginning and check each step carefully. million liters

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4. –/3 points MoaveniEES2 5.4.014. My Notes
Question Part
Points
Submissions Used
1 2 3
–/1 –/1 –/1
0/100 0/100 0/100
Total
–/3
 
  • This exercise will let students review and reference question concepts.
  • Read It links are available as a learning tool under each question so students can quickly jump to the corresponding section of the eTextbook.
  • Students get just-in-time learning support with Watch It videos that contain narrated and closed-captioned videos walking students through the proper steps to solve a similar problem.

The amount of natural gas that you would burn to heat 16 gallons of water from room temperature at 67°F to 120°F to take a shower is 7.07 ft3. Determine the additional amount of gas that must be burned (in ft3) if the water heater has an efficiency of the following. (One cubic foot of natural gas has an energy content of 1,000 Btu, or 1.05 ✕ 106 J.)
(a)
80 percent
ft3
(b)
85 percent
ft3
(c)
90 percent
ft3

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5. –/2 points MoaveniEES2 5.4.012. My Notes
Question Part
Points
Submissions Used
1 2
–/1 –/1
0/100 0/100
Total
–/2
 
  • This exercise will let students review and reference question concepts.
  • Read It links are available as a learning tool under each question so students can quickly jump to the corresponding section of the eTextbook.
  • Students get just-in-time learning support with Watch It videos that contain narrated and closed-captioned videos walking students through the proper steps to solve a similar problem.

An air-conditioning unit has a cooling capacity of 18,750 Btu/h. If the unit has a rated energy efficiency ratio (EER) of 10, how much electrical energy (in kW) is consumed by the unit in one hour?
kW
If a power company charges 12 cents per kWh for usage, how much would it cost (in dollars per month) to run the air-conditioning unit for a month (31 days), assuming the unit runs ten hours a day?
$ per month

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6. –/1 points MoaveniEES2 5.4.006. My Notes
Question Part
Points
Submissions Used
1
–/1
0/100
Total
–/1
 
  • This exercise will let students review and reference question concepts.
  • Read It links are available as a learning tool under each question so students can quickly jump to the corresponding section of the eTextbook.
  • Students get just-in-time learning support with Watch It videos that contain narrated and closed-captioned videos walking students through the proper steps to solve a similar problem.

A power plant has an overall efficiency of 35%. The plant generates 19 MW of electricity and uses coal as fuel. Determine how much coal must be burned (in lbm/s) to sustain the generation of 19 MW of electricity. (One pound of coal has an energy content of 10.5 ✕ 106 J.)
lbm/s

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7. –/2 points MoaveniEES2 5.2.005. My Notes
Question Part
Points
Submissions Used
1 2
–/1 –/1
0/100 0/100
Total
–/2
 
  • This exercise will let students review and reference question concepts.
  • Read It links are available as a learning tool under each question so students can quickly jump to the corresponding section of the eTextbook.
  • Students get just-in-time learning support with Watch It videos that contain narrated and closed-captioned videos walking students through the proper steps to solve a similar problem.

Determine the gross force (in N) needed to bring a car that is traveling at 102 km/h to a full stop in a distance of 100 m. The mass of the car is 2,050 kg. (Enter the magnitude.)
N
What happens to the initial kinetic energy? Where does it go or to what form of energy does the kinetic energy convert?
    

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8. –/2 points MoaveniEES2 5.3.004. My Notes
Question Part
Points
Submissions Used
1 2
–/1 –/1
0/100 0/100
Total
–/2
 
  • This exercise will let students review and reference question concepts.
  • Read It links are available as a learning tool under each question so students can quickly jump to the corresponding section of the eTextbook.
  • Students get just-in-time learning support with Watch It videos that contain narrated and closed-captioned videos walking students through the proper steps to solve a similar problem.

An elevator has a rated capacity of 2,250 pound mass (1,013 kg). It can transport people at the rated capacity between the first and the ninth floors in 20 seconds with a vertical distance of 15 ft (4.6 m) between each floor. Calculate the power requirement for such an elevator.
in W W in hp hp

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9. –/1 points MoaveniEES2 5.2.002. My Notes
Question Part
Points
Submissions Used
1
–/1
0/100
Total
–/1
 
  • This exercise will let students review and reference question concepts.
  • Read It links are available as a learning tool under each question so students can quickly jump to the corresponding section of the eTextbook.
  • Students get just-in-time learning support with Watch It videos that contain narrated and closed-captioned videos walking students through the proper steps to solve a similar problem.

Consider the following cases.
  • Case 1: to change the speed of a car from 0 to 36 mph (0 to 58 km/h)
  • Case 2: to change the speed of a car from 36 to 62 mph (58 to 100 km/h)
Which of the case requires more work?
    

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10. –/2 points MoaveniEES2 5.2.001. My Notes
Question Part
Points
Submissions Used
1 2
–/1 –/1
0/100 0/100
Total
–/2
 
  • This exercise will let students review and reference question concepts.
  • Read It links are available as a learning tool under each question so students can quickly jump to the corresponding section of the eTextbook.
  • Students get just-in-time learning support with Watch It videos that contain narrated and closed-captioned videos walking students through the proper steps to solve a similar problem.

If you were to push a lawn mower with a constant horizontal force of 18 N, how much work would you do while pushing the lawn mower a total distance of 6 m on level ground?
in N · m N · m in ft · lbf ft · lbf

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