Recent content by chem3

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    Solve Logic Problem Using Pigeonhole Principle

    Ok from counting principles: The numbers of pairs you can choose from a group of n elements (order does not matter here) is: (n // 2) i.e. n choose 2 and that's = n!/((n-2)!2!) = ... = n(n-1)/2 I got stuck right there!
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    Solve Logic Problem Using Pigeonhole Principle

    That's all what the question said! I think it may need some other logic principles used along with the pigeonhole principle to solve it?
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    Solve Logic Problem Using Pigeonhole Principle

    Hello, I have this logic problem which I know should be solved by the pigeonhole principle but I was not successful in solving it after many tries and I hope someone here would help me out. The problem says: n integer numbers are given. Show that there are at least two numbers among them...
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    Calculating Max Height in Relative Projectile Motion: Earth vs. Moving Elevator

    Well - considering Newton's classical equations of motion - the maximum height from the ground and the maximum height from the elevator are indeed reached simultaneously! AFAIK! Any other opinions!
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    Calculating Max Height in Relative Projectile Motion: Earth vs. Moving Elevator

    Thanks for your reply LENIN! Any other opinions, please? Cause my teacher insists that the first solution is the right one, and I really need a strong argument (no relativity stuff please - all classical) to prove him wrong!
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    Calculating Max Height in Relative Projectile Motion: Earth vs. Moving Elevator

    Hello, This is my first post here and I have the following question, please: A body is thrown vertically upward from the surface of the Earth with an initial velocity of 7 m/s. Simultaneously an elevator cab starts to move upward from the same height the body was thrown from (the surface...
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