Recent content by mshiddensecret

  1. M

    Chain Rule with Partial Derivative?

    Homework Statement Given that the surface x^7y^2+y^4z^6+z^8x^8+9xyz=12 has the equation z=f(xy) in a neighbourhod of the point (1,1,1) with f(x,y) differentiable, find the derivatives. df/dx (1,1) = ? d^2f/dx^2 (1,1) = ? Homework EquationsThe Attempt at a Solution df/dx (1,1) I got -24/23 or...
  2. M

    Solving Higher Order ODEs: y''''''+y'''=t

    Homework Statement y''''''+y'''=t Homework EquationsThe Attempt at a Solution I got all the roots and solved the homo eq. Then I tried to guess the partial eq and got At+B However, I don't know how to proceed because the 6th derivative or the 3rd would be 0.
  3. M

    Which Direction Does the Force on the Electrons Act in a TV Tube?

    Vertical is the one I found. So, if I cos 66, I should find the total field.
  4. M

    Which Direction Does the Force on the Electrons Act in a TV Tube?

    Well the formula is qv x b. So by sin 66, it makes it orthogonal to it.
  5. M

    Which Direction Does the Force on the Electrons Act in a TV Tube?

    What do you suggest?
  6. M

    Which Direction Does the Force on the Electrons Act in a TV Tube?

    24?
  7. M

    Which Direction Does the Force on the Electrons Act in a TV Tube?

    I have no idea at this point.
  8. M

    Which Direction Does the Force on the Electrons Act in a TV Tube?

    6.05e-16 N was my answer for C.
  9. M

    Which Direction Does the Force on the Electrons Act in a TV Tube?

    What do you mean by the wrong value for the angle? 66?
  10. M

    Which Direction Does the Force on the Electrons Act in a TV Tube?

    A) I found out. It is east. B) I got the correct answer C) I multiply the force which I got before dividing it by the mass to get the acceleration. And multiply by sin 66 which is incorrect. I am lost
  11. M

    Which Direction Does the Force on the Electrons Act in a TV Tube?

    Homework Statement The electrons in the beam of a television tube have an energy of 15 keV. The tube is oriented so that the electrons move horizontally from south to north. The vertical component of the Earth's magnetic field at the location of the television has a magnitude of 57.0 μT and is...
  12. M

    Integrating e^(2t)(25sint+20cost)dt using Integration by Parts

    Homework Statement Integrate: (e^(2t))(25sint+20cost)dt Homework Equations Integration by parts twice The Attempt at a Solution I don't know what to set for u and v. I ended up wolfram alpha it but I want to know how to get there. The solution is: e^(2t)(14sint+3cost)=C
  13. M

    Solving a Homework Equation: (3xy^2+4y)dx+(3x^2y+4x)dy=0

    So C = 0?
  14. M

    Solving a Homework Equation: (3xy^2+4y)dx+(3x^2y+4x)dy=0

    No after I integrated, I got 3/2x^2y^2+4xy Then differentiate and got 3x^2y+4x
  15. M

    Solving a Homework Equation: (3xy^2+4y)dx+(3x^2y+4x)dy=0

    Homework Statement (3xy^2+4y)dx+(3x^2y+4x)dy=0Homework Equations The Attempt at a Solution So First I checked if both equations were exact. I took the derivative of 3xy^2+4y and also derivative of the other and they were both equal so the equation is exact. I took the 3xy^2+4y and integrated...
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