Author Question: Coefficient of performance is A) 1 - Qcold/Qhot. B) Q/m. C) Qout/Win. D) Q - W. E) 1 - ... (Read 35 times)

Bob-Dole

  • Hero Member
  • *****
  • Posts: 547
Coefficient of performance is
 
  A) 1 - Qcold/Qhot.
  B) Q/m.
  C) Qout/Win.
  D) Q - W.
  E) 1 - Tcold/Thot.

Question 2

Usually one can touch the terminals of a battery (e.g., 1.5 volts) with no dire consequences.
 
  Why do hospital intensive care rooms go to great effort and expense to attach ground wires to equipment in order to guard against the presence of low potentials? (i.e., why are low voltages hazardous in hospitals?)



gasdhashg

  • Sr. Member
  • ****
  • Posts: 335
Answer to Question 1

C

Answer to Question 2

Most of the body resistance is at the relatively dry skin-air boundary and this is sufficient to prevent dangerous currents through the body. In a hospital setting one may have needles or other probes penetrating this protective layer and the possibility exists for much larger currents being driven by relatively small voltages.



Related Topics

Need homework help now?

Ask unlimited questions for free

Ask a Question


 

Did you know?

The Centers for Disease Control and Prevention has released reports detailing the deaths of infants (younger than 1 year of age) who died after being given cold and cough medications. This underscores the importance of educating parents that children younger than 2 years of age should never be given over-the-counter cold and cough medications without consulting their physicians.

Did you know?

The cure for trichomoniasis is easy as long as the patient does not drink alcoholic beverages for 24 hours. Just a single dose of medication is needed to rid the body of the disease. However, without proper precautions, an individual may contract the disease repeatedly. In fact, most people develop trichomoniasis again within three months of their last treatment.

Did you know?

An identified risk factor for osteoporosis is the intake of excessive amounts of vitamin A. Dietary intake of approximately double the recommended daily amount of vitamin A, by women, has been shown to reduce bone mineral density and increase the chances for hip fractures compared with women who consumed the recommended daily amount (or less) of vitamin A.

Did you know?

If all the neurons in the human body were lined up, they would stretch more than 600 miles.

Did you know?

Tobacco depletes the body of vitamins A, C, and E, which can result in any of the following: dry hair, dry skin, dry eyes, poor growth, night blindness, abscesses, insomnia, fatigue, reproductive system problems, sinusitis, pneumonia, frequent respiratory problems, skin disorders, weight loss, rickets, osteomalacia, nervousness, muscle spasms, leg cramps, extremity numbness, bone malformations, decayed teeth, difficulty in walking, irritability, restlessness, profuse sweating, increased uric acid (gout), joint damage, damaged red blood cells, destruction of nerves, infertility, miscarriage, and many types of cancer.

For a complete list of videos, visit our video library