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Thread: Physics 20- wave property question(s)

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    Default Physics 20- wave property question(s)

    Ok, this are pretty simple but i havent really been paying attention so I don't get them one bit haha help would be appreciated.

    A wave travels along a light spring. The length of this wave is 5.0x10^-1, and the frequency is 3.0 Hz. What is the length of the wave in the heavy spring if the speed in the heavy spring is 1.0 m/s?
    thanks a bunch in advance (i might add more later)
    “Ignorance, the root and the stem of every evil.”

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    If the frequency is constant, then would it not be 1/3?
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    Quote Originally Posted by Nava2 View Post
    If the frequency is constant, then would it not be 1/3?
    how did you come to that? Haha i don't understand any of this shit.
    “Ignorance, the root and the stem of every evil.”

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    Wavelength formula




    C=λv or λ=C/v
    Frequency = Velocity divided by wavelength
    C is the velocity, which is the speed of light ~3.00 × 108 m/sec
    λ is the wavelength
    v is the frequency
    Thats the formula, it's simply multiplication. I'm also doing this in school.

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    Quote Originally Posted by Buckleyindahouse View Post
    Thats the formula, it's simply multiplication. I'm also doing this in school.
    I understand the formula' ssomewhat, but when the wave is traveling to a faster medium, then certainly the frequency changes and so does the wavelength no? That's the part I do not understand, but maybe I'm just retarded.
    “Ignorance, the root and the stem of every evil.”

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    Quote Originally Posted by Buckleyindahouse View Post
    Thats the formula, it's simply multiplication. I'm also doing this in school.
    I think you'll find this wave isn't travelling at the speed of light

    I'd argue that you haven't been given sufficient information to answer the question. But the answer they probably want is:
    v=fλ
    λ=v/f
    λ=1/3

    I.e. frequency of the wave in both is the same.

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    silent wolf you are correct thank you everyone. I have 150 multiple choice due on wednesday so I'll have alot more questions coming
    “Ignorance, the root and the stem of every evil.”

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    new questions:

    A horizontal force of 15N is applied to a 4.0kg block sitting on a level surface for which the coefficient of friction is 0.30. What is the acceleration of the block?

    a. it remains stationary.
    b. 0.75 m/s^2
    c. 0.81 m/s^2
    d. the block does not accelerate
    a baseball bat exerts a force of +950N on a 150g ball with an 800g bat. At the moment of impact, what is the respective acceleration of the ball and bat ?

    a. Ball = -1.19x10^3 ; Bat = +6.33x10^3
    b. Ball = -6.33x10^3; bat = +1.19x10^3
    c. Ball = +6.33x10^3; bat = -1.19x10^3
    d. Ball = +1.19x10^3; bat = -6.33x10^3
    if you could provide explanation as i need to provide proof that i know how to solve the answer. Thanks
    “Ignorance, the root and the stem of every evil.”

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    Quote Originally Posted by Buckleyindahouse View Post
    Thats the formula, it's simply multiplication. I'm also doing this in school.
    This is Newtonian physics, don't get mistaken for quantum That equation is for sub atomic particles.
    Oh Hai Dar

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    Quote Originally Posted by Blumblebee View Post
    new questions:


    A horizontal force of 15N is applied to a 4.0kg block sitting on a level surface for which the coefficient of friction is 0.30. What is the acceleration of the block?

    a. it remains stationary.
    b. 0.75 m/s^2
    c. 0.81 m/s^2
    d. the block does not accelerate


    a baseball bat exerts a force of +950N on a 150g ball with an 800g bat. At the moment of impact, what is the respective acceleration of the ball and bat ?

    a. Ball = -1.19x10^3 ; Bat = +6.33x10^3
    b. Ball = -6.33x10^3; bat = +1.19x10^3
    c. Ball = +6.33x10^3; bat = -1.19x10^3
    d. Ball = +1.19x10^3; bat = -6.33x10^3


    if you could provide explanation as i need to provide proof that i know how to solve the answer. Thanks
    Q1: F=ma, F=coeff_of_frection*reaction_force

    reaction_force = mg

    Plug the numbers in.


    Q2: F=ma, a=F/m. c

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    Quote Originally Posted by Main_Ftw View Post
    This is Newtonian physics, don't get mistaken for quantum That equation is for sub atomic particles.
    no he was correct, my first question differs from the area of my second.

    Quote Originally Posted by silentwolf View Post
    Q1: F=ma, F=coeff_of_frection*reaction_force

    reaction_force = mg

    Plug the numbers in.


    Q2: F=ma, a=F/m. c
    hmm, I feel like a ritard. Thanks
    “Ignorance, the root and the stem of every evil.”

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    Quote Originally Posted by Main_Ftw View Post
    This is Newtonian physics, don't get mistaken for quantum That equation is for sub atomic particles.
    v = labda * f
    applies to all waves...

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