« previous next »

Author Question: On a cold day, a heat pump absorbs heat from the outside air at 14F (-10C) and transfers it into a ... (Read 401 times)

CharlieWard

  • Hero Member
  • *****
  • Posts: 578
on: Jul 28, 2018
On a cold day, a heat pump absorbs heat from the outside air at 14F (-10C) and transfers it into a home at a temperature of 86F (30C). Determine the maximum COP of the heat pump.
 a. 0.2
  b. 4.4
  c. 0.5
  d. 7.6
  e. 6.7

Question 2

A heat engine absorbs 2 500 J of heat from a hot reservoir and expels 1 000 J to a cold reservoir. When it is run in reverse, with the same reservoirs, the engine pumps 2 500 J of heat to the hot reservoir, requiring 1 500 J of work to do so. Find the ratio of the work done by the heat engine to the work done by the pump. Is the heat engine reversible?
 a. 1.0 (no)
  b. 1.0 (yes)
  c. 1.5 (yes)
  d. 1.5 (no)
  e. 2.5 (no)


succesfull

  • Sr. Member
  • ****
  • Posts: 339
Reply #1 on: Jul 28, 2018
Answer to Question 1

D

Answer to Question 2

B


Related Topics

Need homework help now?

Ask unlimited questions for free

Ask a Question
« previous next »
 

Did you know?

Many medications that are used to treat infertility are injected subcutaneously. This is easy to do using the anterior abdomen as the site of injection but avoiding the area directly around the belly button.

Did you know?

Always store hazardous household chemicals in their original containers out of reach of children. These include bleach, paint, strippers and products containing turpentine, garden chemicals, oven cleaners, fondue fuels, nail polish, and nail polish remover.

Did you know?

The liver is the only organ that has the ability to regenerate itself after certain types of damage. As much as 25% of the liver can be removed, and it will still regenerate back to its original shape and size. However, the liver cannot regenerate after severe damage caused by alcohol.

Did you know?

Inotropic therapy does not have a role in the treatment of most heart failure patients. These drugs can make patients feel and function better but usually do not lengthen the predicted length of their lives.

Did you know?

According to the FDA, adverse drug events harmed or killed approximately 1,200,000 people in the United States in the year 2015.

Shifts between Warm and Cold Periods during the Last 3 Million Years Shifts between Warm and Cold Periods during the Last 3 Million Years
Opioid Combination Drugs for Severe Cold Symptoms Opioid Combination Drugs for Severe Cold Symptoms
A typical lubrication system, showing the oil pan, oil pump, oil filter, and oil passages. A typical lubrication system, showing the oil pan, oil pump, oil filter, and oil passages.
Fluidization - Chart Pump #1 Fluidization - Chart Pump #1
Instruct recipient on giving you feedback immediately if heat becomes too intense. Remind the person ... Instruct recipient on giving you feedback immediately if heat becomes too intense. Remind the person ...
how much energy is needed to heat 77.0g H2O(s) from -10.0 C to 0.0 C? how much energy is needed to heat 77.0g H2O(s) from -10.0 C to 0.0 C?
Video: Acid-base imbalances - metabolic acidosis and alkalosis

For a complete list of videos, visit our video library