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    Physics homework help (12U)

    A 700 g weight is held on a steel cable and spun in a vertical circle. If the cable can withstand a tension of 4100 N, at what velocity will the cable break. (Hint the tension is not the same throughout the period of rotation?
    EDIT: I'm really sorry if this is the wrong section! Just send me a warning and I promise I'll watch myself next time!

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    Way to use us for the wrong section...
    And we'd probably just give you the wrong answers.
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    Quote Originally Posted by ZigZak View Post
    A 700 g weight is held on a steel cable and spun in a vertical circle. If the cable can withstand a tension of 4100 N, at what velocity will the cable break. (Hint the tension is not the same throughout the period of rotation?
    EDIT: I'm really sorry if this is the wrong section! Just send me a warning and I promise I'll watch myself next time!
    It would be helpful to state relevant equations you've learned in class if you want some help. Usually looking at these equations and their constituents will usually help you figure out what to use to solve the problem.

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    @iverson954360
    I found this question somewhere else just now, but the thing is, you need radius to calculate this... And where I found the answer it says to assume the radius is 1m.

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    Quote Originally Posted by ZigZak View Post
    @iverson954360
    I found this question somewhere else just now, but the thing is, you need radius to calculate this... And where I found the answer it says to assume the radius is 1m.
    You can try typing it into yahoo answers always helped me
    Quote Originally Posted by LunaScratch View Post
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    Quote Originally Posted by ZigZak View Post
    @iverson954360
    I found this question somewhere else just now, but the thing is, you need radius to calculate this... And where I found the answer it says to assume the radius is 1m.
    You probably want to use centripetal force equations to calculate this problem.

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    You need to give us the radius or the tension in order for me to solve this equation aff
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    Quote Originally Posted by The Force View Post
    You need to give us the radius or the tension in order for me to solve this equation aff
    You set the force equal to the critical tension given and as he said if he has to assume a radius of 1m he would have all he needs to solve for velocity.

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    Quote Originally Posted by iverson954360 View Post


    You set the force equal to the critical tension given and as he said if he has to assume a radius of 1m he would have all he needs to solve for velocity.
    Ivy to the rescue

    Quote Originally Posted by ZigZak View Post
    A 700 g weight is held on a steel cable and spun in a vertical circle. If the cable can withstand a tension of 4100 N, at what velocity will the cable break. (Hint the tension is not the same throughout the period of rotation?
    EDIT: I'm really sorry if this is the wrong section! Just send me a warning and I promise I'll watch myself next time!
    Well then little kid /aff You're lucky I don't feel like doing my political cartoon aff

    According to the centripetal force formula

    Fc (subscript c) = mv^2 / 2

    Fnet (subscript net) = ma, which is equal to Ft (tension subscript) - Fg (gravity subscript).

    This will give you 4100 - (0.700)(9.81) = mv^2 / r = (0.700)v^2 (We use 4100 because tension is greater bottom of the rotation and less on the top)(We will use the 4100 on the top because the rotation is vertical. The top part is according to the gravity, and the bottom is going against it)

    This will get you 4093.133 = 0.7v^2

    4093.11 / 0.7 = 5847.33

    Squareroot that and you get 76.47 rounded to the tenth.

    Now in your original question the lowest significant digit is 1, so it would become 8*10^1
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    ALL THIS KNOWLEDGEEEEEEEEEE
    Quote Originally Posted by LunaScratch View Post
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    Quote Originally Posted by HuxJr View Post
    ALL THIS KNOWLEDGEEEEEEEEEE
    Nigga didn't even thank me aff.

    Never helping some kiddie with hw again aff
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    We need extra information, we can't work it out from 1 set of results, this case (N), we need radius.

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    Usually looking at these equations and their constituents will usually help you figure out what to use to solve the problem.

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    Quote Originally Posted by The Force View Post


    Nigga didn't even thank me aff.

    Never helping some kiddie with hw again aff
    Well thanks this time! Can't wait to be done with school...

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    Quote Originally Posted by iverson954360 View Post


    It would be helpful to state relevant equations you've learned in class if you want some help. Usually looking at these equations and their constituents will usually help you figure out what to use to solve the problem.
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