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B Bullet velocity

  1. Nov 22, 2016 #1

    Imagine there is a four gram bullet, but someone want to accelerate it with force or power equal to 100,000 horsepower. How far the distance will the lightweight bullet cover in a second?
  2. jcsd
  3. Nov 22, 2016 #2
    Are you accelerating the bullet with force or power? They're two different things, and only one of them causes acceleration.
    Doing work on the bullet over time equivalent to 100000 horsepower will put energy into the bullet; if all of this energy becomes kinetic energy, you can integrate the power over 1 second to get the energy change, from which you can find velocity.
  4. Nov 22, 2016 #3
    So, how much is the distance covered by the four gram bullet in a second?
  5. Nov 22, 2016 #4
    The velocity multiplied by 1 second is your distance. The math is up to you.
  6. Nov 22, 2016 #5


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    Staff: Mentor

    Force and power are completely different things. Power doesn't cause acceleration, and forces aren't measured in horsepower, so your question makes no sense. You will have to think more carefully about exactly what you're trying to ask, and then when you know what you you want to ask you can ask it, and you'll get better more helpful answers.
  7. Nov 22, 2016 #6


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    Science Advisor

    This is a basic homework-like question, so we expect you to work it out like a homework problem. Since you might not have any physics background, I'll give some hints. Power is just the change in energy over time. What is the equation for kinetic energy? Since the velocity is not constant, you need to integrate the velocity to find the distance.
  8. Nov 23, 2016 #7
    No, this is not a homework. I have no experiences in advanced mathematics, that's why I asking this question.
  9. Nov 23, 2016 #8
    But you can easily learn basic definitions so your questions make sense.
  10. Nov 23, 2016 #9


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    Science Advisor

    If you know a little algebra and the equation for kinetic energy, you can calculate the final velocity. If you know a little calculus, you can calculate the distance traveled. Unless you really need the answer right away, you should take the opportunity to learn how to do it.
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