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Author Question: If the density of the universe is less than the critical density, then the total energy of the ... (Read 93 times)

gbarreiro

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on: Jul 29, 2018
If the density of the universe is less than the critical density, then the total energy of the universe is
 
  A) zero. B) negative. C) positive.

Question 2

A rocket with a mass of 2.0  106 kg is designed to take off from the surface of the earth by burning fuel and ejecting it with an exhaust speed of 3500 m/s.
 
  What is the minimum rate at which the fuel should be consumed in order to attain liftoff? A)
 
  5.6  103 kg/s
  B)
 
  1.4  103 kg/s
  C)
 
  1.8  103 kg/s
  D)
 
  2.8  103 kg/s
  E)
 
  18  103 kg/s


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Yixagurpuldink

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

C

Answer to Question 2

A


gbarreiro

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Reply #2 on: Jul 29, 2018
Thank you!


Yixagurpuldink

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Reply #3 on: Jul 29, 2018
Always glad to help...


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