The United States consumes 2.5 1019 J of energy each year. A ...

[arivle123]

The United States consumes 2.5  1019 J of energy each year. A typical solar flare releases 5.0  1024 J of energy. How many years could we run the United States on the energy released by this solar flare if all of the released energy could be used?
 
  a. 5  10-6 years
  b. 200,000 years
  c. 1.25  1044 years
  d. about 12 years
  e. 500 years

Question 2

When two objects of unequal masses orbit each other, the center of mass is
 
  a. at the center of the more massive object.
  b. at the center of the least massive object.
  c. half way between the centers of each object.
  d. always closer to the less massive of the two objects.
  e. always closer to the more massive of the two objects.

[Ptupou85]

Answer to Question 1

b

Answer to Question 2

e

[arivle123]

Excellent

[cdmart10]

TYSM