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Author Question: A rocket is fired in a gravity-free environment in deep space. The rocket has an initial mass of ... (Read 64 times)

Lisaclaire

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on: Jul 29, 2018
A rocket is fired in a gravity-free environment in deep space. The rocket has an initial mass of 8000 kg and ejects gas with a velocity of 2000 m/s. How much gas must be ejected in the first second to give the rocket an acceleration of 30.0 m/s2?
 
  A) 120 kg
  B) 7.50 kg
  C) 15.0 kg
  D) 12.0 kg
  E) 150 kg

Question 2

Which one of the following is the correct expression for the energy of the photon?
 
  A) E = h/f
  B) E = h/c
  C) E = hc/
  D) E = c/h
  E) E = h


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tsternbergh47

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

A

Answer to Question 2

C


Lisaclaire

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Reply 2 on: Jul 29, 2018
Excellent

pangili4

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Reply 3 on: Yesterday
Great answer, keep it coming :)

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