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    [email protected] scam?

    Hello guys. I recieved eMail from [email protected] telling, that i am winner in a lottery program. i think it must be scam, and usafis.net is not sender. is it worth hoping? :D thanks
  2. L

    A 9000kg railroad car moving at 3 m/s strikes a stationary (not moving) 5000gk

    railroad car.? What is the kinetic energy of the 9000kg railroad car before the collision? what is the momentum of the 9000kg railroad car before the collision? if the two railroad cars couple and move off together after the collision, what is their velocity?
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    a 40 kilogrambarrel is rolled up a 10 meter long ramp to a height of 5meters.?

    how much does ths weight ? If the person exerted force of 250 Newtons to roll the barrel along the ramp, which is the efficiency of the ramp?
  4. L

    Civilization with human instincts? impossible?

    Guys just muse your ideas about it
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