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Author Question: One unusual aspect of dark energy is A) its pushes outward on everything in the universe instead ... (Read 37 times)

bclement10

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on: Jul 29, 2018
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?


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Kingjoffery

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Reply #1 on: Jul 29, 2018
Answer to Question 1

C

Answer to Question 2

(a) 1.9 mm (b) 0.49 mm


bclement10

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Reply 2 on: Jul 29, 2018
Wow, this really help

xiazhe

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Reply 3 on: Yesterday
YES! Correct, THANKS for helping me on my review

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