The World Today - Comment

 

Question 247: Which physical law is behind the idea of a rocket engine?
Author: K. - Category: Technology
Difficulty: 1/5 - Zone: World

  • The law of gravity
  • The action-reaction principle
  • The law on the conservation of energy
  • The General Relativity

    Your name: Your email*:
    Comment on the question:

    I have been receiving large quantities of spam through this comment fonctionality, which is particularily dumb from the spammers since nobody but me ever gets to see the comments in question, and I am interested neither in porn nor gambling websites.
    As a result, I am forced to add a verification process. Please answer the question below to prove you are not a spamming bot:

    What is the capital of Italy?

    Answer:

    *Only if you want me to be able to contact you concerning your comment

    		•