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Author Question: If we double only the mass of a vibrating ideal mass-and-spring system, the mechanical energy of the ... (Read 78 times)

shenderson6

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on: Jul 29, 2018
If we double only the mass of a vibrating ideal mass-and-spring system, the mechanical energy of the system
 
  A) increases by a factor of .
  B) increases by a factor of 2.
  C) increases by a factor of 3.
  D) increases by a factor of 4.
  E) does not change.

Question 2

Air is flowing through a rocket nozzle. Inside the rocket the air has a density of 5.25 kg/m3 and a speed of 1.20 m/s. The interior diameter of the rocket is 15.0 cm. At the nozzle exit, the diameter is 2.50 cm and the density is 1.29 kg/m3.
 
  What is the speed of the air when it leaves the nozzle?
  A) 123 m/s
  B) 176 m/s
  C) 88.0 m/s
  D) 45.7 m/s
  E) 29.3 m/s


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connor417

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

Answer: E

Answer to Question 2

Answer: B


shenderson6

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  • Posts: 573
Reply 2 on: Jul 29, 2018
YES! Correct, THANKS for helping me on my review

xiaomengxian

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Reply 3 on: Yesterday
Wow, this really help

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