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  1. #1
    gooby pls Father of Cajun's Avatar
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    Reps for physics help

    Collision problem, and I can't figure out how they got this answer.


    You have been asked to design a 'ballistic spring system' to measure the speed of bullets. A bullet of mass m1 is fired into a bullet of mass M2. The block, with the embedded bullet, then slides across a frictionless table and collides with a horizontal spring whose spring constant is k. The opposite end of the spring is anchored to a wall. The spring's maximum compression d is measured.

    Find an expression for the bullet's speed VB in terms of m1, M2, k, and d.


    The back of the book says

    VB= sqrt((m1+m2)*kd^2)/m^2)
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  2. #2
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    Lol I still can't pass optics
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  3. #3
    Thank you based god clemburger's Avatar
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    Physics makes me hate school.
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  4. #4
    Banned .Excalibur's Avatar
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    sounds to me like you just have to plug in the numbers
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  5. #5
    gooby pls Father of Cajun's Avatar
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    Originally Posted by .Excalibur View Post
    sounds to me like you just have to plug in the numbers
    No, it wants the general formula using variables. I figured it out though. Next question, which I just can't remember how to do, is how to find energy lost in a collision.

    edit: The answer I gave at the bottom of the post is what the book said the answer was. I think I figured out why.
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  6. #6
    Registered User iJarhead's Avatar
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    Originally Posted by Father of Cajun View Post
    No, it wants the general formula using variables. I figured it out though. Next question, which I just can't remember how to do, is how to find energy lost in a collision.

    edit: The answer I gave at the bottom of the post is what the book said the answer was. I think I figured out why.
    Energy lost in a collision?

    As in measure the amount of energy the object had before impact?
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  7. #7
    gooby pls Father of Cajun's Avatar
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    Originally Posted by iJarhead View Post
    Energy lost in a collision?

    As in measure the amount of energy the object had before impact?
    Sort of. According to http://www.mcasco.com/qa_icel.html

    It's simply 1/2 m*v^2 of the objects before minus 1/2m*v^2 of the object after.

    Given that the speed of the bullet is 200 m/s and the mass of the bullet is 5 g. the mass of the block it hits is 2 kg

    1/2(.005 kg)(200m/s)^2=100 N


    after impact, 1/2(2.005 kg)(.499 m/s)^2=.24N


    never mind. That's the right answer<_<. Thanks guys.
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  8. #8
    Banned MistuuhMitch's Avatar
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    Originally Posted by Father of Cajun View Post
    Collision problem, and I can't figure out how they got this answer.


    You have been asked to design a 'ballistic spring system' to measure the speed of bullets. A bullet of mass m1 is fired into a bullet of mass M2. The block, with the embedded bullet, then slides across a frictionless table and collides with a horizontal spring whose spring constant is k. The opposite end of the spring is anchored to a wall. The spring's maximum compression d is measured.

    Find an expression for the bullet's speed VB in terms of m1, M2, k, and d.


    The back of the book says

    VB= sqrt((m1+m2)*kd^2)/m^2)
    if thats what college level looks like then i am phucked.
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  9. #9
    gooby pls Father of Cajun's Avatar
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    Originally Posted by MistuuhMitch View Post
    if thats what college level looks like then i am phucked.
    Tbh, this is one of the easier ones, but I'm on Fluids and stuff now and I was just having a brainfart with this.
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  10. #10
    AR-15 User AdamBombed's Avatar
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    if you tell me what text book your using, chapter and problem, i can look it up
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  11. #11
    gooby pls Father of Cajun's Avatar
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    Originally Posted by AdamBombed View Post
    if you tell me what text book your using, chapter and problem, i can look it up
    :O Physics: A Strategic Approach by Randall D. Knight,2nd edition.

    I'll PM you with a problem in a minute. I figured that one out and I'm working through some more now.
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  12. #12
    AR-15 User AdamBombed's Avatar
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    "College Physics: A Strategic Approach (2nd) textbook problems explained step-by-step"

    cramster ftw, pm away
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  13. #13
    gooby pls Father of Cajun's Avatar
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    Originally Posted by AdamBombed View Post
    "College Physics: A Strategic Approach (2nd) textbook problems explained step-by-step"

    cramster ftw, pm away
    Thanks man I will for sure, just let me find one I can't figure out.
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