This topic contains a solution. Click here to go to the answer

Author Question: It is now known that, overall, clouds ____ effect on climate. A) have a net warming B) have a net ... (Read 127 times)

laurencescou

  • Hero Member
  • *****
  • Posts: 593
It is now known that, overall, clouds ____ effect on climate.
 A) have a net warming
  B) have a net cooling
  C) have no net
  D) alone have an

Question 2

Using the concept of latent heat, explain why perspiration is an effective way of reducing a person's body temperature.



Related Topics

Need homework help now?

Ask unlimited questions for free

Ask a Question
Marked as best answer by a Subject Expert

itsakadoozi

  • Sr. Member
  • ****
  • Posts: 317
Answer to Question 1

B

Answer to Question 2

The process of a phase change, such as the evaporation of perspiration from the skin, requires the exchange of energy known as latent heat. As molecules of water escape, or evaporate, from the skin, energy is taken from the environment. During evaporation, the more energetic, faster-moving molecules escape most easily and the average motion of all the molecules left behind decreases as each additional molecule evaporates. Since temperature is a measure of average molecular motion, the slower motion suggests a lower water temperature. Therefore, evaporation is a cooling process because the energy needed to change the water's phase from liquid to a gas is taken from the environment.





 

Did you know?

The highest suicide rate in the United States is among people ages 65 years and older. Almost 15% of people in this age group commit suicide every year.

Did you know?

Over time, chronic hepatitis B virus and hepatitis C virus infections can progress to advanced liver disease, liver failure, and hepatocellular carcinoma. Unlike other forms, more than 80% of hepatitis C infections become chronic and lead to liver disease. When combined with hepatitis B, hepatitis C now accounts for 75% percent of all cases of liver disease around the world. Liver failure caused by hepatitis C is now leading cause of liver transplants in the United States.

Did you know?

Cytomegalovirus affects nearly the same amount of newborns every year as Down syndrome.

Did you know?

There are approximately 3 million unintended pregnancies in the United States each year.

Did you know?

In Eastern Europe and Russia, interferon is administered intranasally in varied doses for the common cold and influenza. It is claimed that this treatment can lower the risk of infection by as much as 60–70%.

For a complete list of videos, visit our video library