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anonymous

  • 4 years ago

An armoured vehicle of mass 5000kg is at rest on a frozen lake where friction is practically zero. It fires a shell of mass 10kg with a nuzzle velocity of 800m/s [N]. Let the time take to travel the length of the barrel be "B" seconds. Calculate the acceleration of the shell

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  1. anonymous
    • 4 years ago
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    Well, if we assume that the shell accelerates uniformly as it travels through the barrel, we can use \[v_f^2 = v_i^2 + 2a\Delta x\] since v_i = 0, we can solve for a: \[a = \frac{v_f^2}{2\Delta x} \] where delta x is the length of the barrel.

  2. anonymous
    • 4 years ago
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    so my answer could have the variable x in it and it would still be right

  3. anonymous
    • 4 years ago
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    Oh, I'm sorry I misread the question. I should have used the other equation:

  4. anonymous
    • 4 years ago
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    Actually it's not even an equation, it's a definition: \[a = \frac{\Delta v}{t} = \frac{v_f}{B} \]

  5. anonymous
    • 4 years ago
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    i got an answer of \[800m/s/B\]

  6. anonymous
    • 4 years ago
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    does it not give you the time B?

  7. anonymous
    • 4 years ago
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    btw how do you do fractions on this thing and no it doesnt

  8. anonymous
    • 4 years ago
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    Odd. And the syntax is \frac{ numerator }{ denominator }

  9. anonymous
    • 4 years ago
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    inside the \[ braces of course.

  10. anonymous
    • 4 years ago
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    alright thanks. so i guess \[\frac{800m/s}{B}\]

  11. anonymous
    • 4 years ago
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    Yep

  12. anonymous
    • 4 years ago
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    thanks

  13. anonymous
    • 4 years ago
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    No problem

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