Which of these are SI units? a. centimeters b. newtons c. ...

[misspop]

Which of these are SI units?
 a. centimeters
  b. newtons
  c. pounds
  d. seconds
  e. none of the above

Question 2

What prevents a large piece of uranium ore from going naturally into a chain reaction?
 a. Because none of its nuclei fission without bombardment from human-controlled sources.
  b. Because even a small chunk is too large to sustain a chain reaction.
  c. Because the sample is not large enough to capture many neutrons.
  d. Because there isn't enough uranium for fissioning neutrons to trigger another reaction.
  e. Because so many of its fissioning neutrons are captured by uranium-238 which then decays in other ways.

[sarajane1989]

Answer to Question 1

B, D

Answer to Question 2

e

[misspop]

Excellent

[meganmoser117]

TYSM