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

Author Question: Gentle gravitational tidal forces appear to be necessary to create spiral arms. a. True b. False ... (Read 71 times)

ssal

  • Hero Member
  • *****
  • Posts: 572
Gentle gravitational tidal forces appear to be necessary to create spiral arms.
 
  a. True
  b. False
  Indicate whether the statement is true or false

Question 2

Why are X-rays and gamma rays considered dangerous forms of light?
 
  a. These forms of light are only produced by large, dangerous machines.
  b. There is no form of protection from these forms of light.
 c. These forms of light break through Earth's atmosphere.
 d. Photons of these wavelengths have high energy.
 e. These forms of light cause sunburn.



Related Topics

Need homework help now?

Ask unlimited questions for free

Ask a Question
Marked as best answer by a Subject Expert

randomguy133

  • Sr. Member
  • ****
  • Posts: 310
Answer to Question 1

True

Answer to Question 2

d





 

Did you know?

Vampire bats have a natural anticoagulant in their saliva that permits continuous bleeding after they painlessly open a wound with their incisors. This capillary blood does not cause any significant blood loss to their victims.

Did you know?

A strange skin disease referred to as Morgellons has occurred in the southern United States and in California. Symptoms include slowly healing sores, joint pain, persistent fatigue, and a sensation of things crawling through the skin. Another symptom is strange-looking, threadlike extrusions coming out of the skin.

Did you know?

The training of an anesthesiologist typically requires four years of college, 4 years of medical school, 1 year of internship, and 3 years of residency.

Did you know?

Illicit drug use costs the United States approximately $181 billion every year.

Did you know?

Many of the drugs used by neuroscientists are derived from toxic plants and venomous animals (such as snakes, spiders, snails, and puffer fish).

For a complete list of videos, visit our video library