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 72 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?

Lower drug doses for elderly patients should be used first, with titrations of the dose as tolerated to prevent unwanted drug-related pharmacodynamic effects.

Did you know?

The horizontal fraction bar was introduced by the Arabs.

Did you know?

Drug-induced pharmacodynamic effects manifested in older adults include drug-induced renal toxicity, which can be a major factor when these adults are experiencing other kidney problems.

Did you know?

When blood is deoxygenated and flowing back to the heart through the veins, it is dark reddish-blue in color. Blood in the arteries that is oxygenated and flowing out to the body is bright red. Whereas arterial blood comes out in spurts, venous blood flows.

Did you know?

Cancer has been around as long as humankind, but only in the second half of the twentieth century did the number of cancer cases explode.

For a complete list of videos, visit our video library