One unusual aspect of dark energy is A) its pushes outward on ...

[bclement10]

One unusual aspect of dark energy is
 
  A) its pushes outward on everything in the universe instead of pulling inward as gravity ordinarily does.
  B) it's made of a material that has not yet been observed in our laboratories.
  C) Both of the above.
  D) it exerts no gravitational force.
  E) it exerts a new kind of fundamental force, never observed before.

Question 2

A 7.0-kg pipe is hung from a steel wire that is 2.5 m long and has a diameter of 0.75 mm. Young's modulus for steel is 2.0  1011 N/m2.
 
  (a) By what distance does the wire stretch?
  (b) If the wire diameter were doubled, what would be the stretch?

[Kingjoffery]

Answer to Question 1

C

Answer to Question 2

(a) 1.9 mm (b) 0.49 mm

[bclement10]

Great answer, keep it coming

[AngeliqueG]

YES! Correct, THANKS for helping me on my review