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Homework Help: Kinetic Energy & Megaton Calculation HELP!

  1. Nov 24, 2007 #1
    1. The problem statement, all variables and given/known data

    A) A relatively small impact crater 20 kilometers in diameter could be made by a comet 2 kilometers in diameter traveling at 34.0 (3.40×104 ).

    Assume that the comet has a total mass of kilograms. What is its total kinetic energy?

    (B) Convert your answer from part A to an equivalent in megatons of TNT, the unit used for nuclear bombs. Comment on the degree of devastation the impact of such a comet could cause if it struck a populated region on Earth. (Hint: One megaton of TNT releases joules of energy.)


    2. Relevant equations
    Kinetic energy = 1/2MV^2


    3. The attempt at a solution

    my attempt:
    =1/2*[4.2*10^12]*[3.4*10^4]^2
    =2.4276*10^21 joules

    For B
    i divided my answer from A by 4.2*10^15 since One megaton of TNT releases 4.2*10^15joules of energy
     
    Last edited: Nov 24, 2007
  2. jcsd
  3. Nov 24, 2007 #2

    mgb_phys

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    Science Advisor
    Homework Helper

    The formating seems to have removed some numbers - so we can't check it.
    But your method is correct
     
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