Recent content by goldfish9776

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    Dy/dx = (y^2) /x , form differential equation

    1. Homework Statement my ans is lnx = (-1/y) + c (-1/y) = lnx -c y = -1/ (lnx -c ) , but the answer given is (-1/ln x )+ C , how to get the answer given ? 2. Homework Equations 3. The Attempt at a Solution
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    Direction of shearing force

    i think the first one is correct , because the shearing force must be applied in 2 different direction , so that the object will be 'teared' . i think the second 1 is incorrect
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    Direction of shearing force

    1. Homework Statement why the shearing force acting on the object in the first diagram is in different direction , while in the second photo , it's in same direction ? 2. Homework Equations 3. The Attempt at a Solution in my opinion , it should be in different direction , because the...
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    Initial velocity

    2 /0.8 = 2.5 1 / (0.4^2) = 6.25 so , the ans is It's 6.25 times , not 6 times?
  5. G

    Initial velocity

    yes, but i still cant understand the velocity increases by 6 times...
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    Initial velocity

    1. Homework Statement how to know that the nozzle increases the velocity of water by 6 times? it's not given .... and no data for initial velocty given 2. Homework Equations 3. The Attempt at a Solution
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    Integrating factor

    can you be fore specific , telling me how should i start with ?
  8. G

    Integrating factor

    i still didnt get the idea, can you explain further?
  9. G

    Integrating factor

    do u mean R(x , y) , how to do it ? i have never studied this before
  10. G

    Integrating factor

    that's why i multiply the whole equation with the integrating factor to get the exact equation , however , i didnt get it . Is my working totally wrong ? or which part is wrong ?
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    Integrating factor

    1. Homework Statement is my integral R(x) and R(y) correct ? why it look so complicated ? 2. Homework Equations 3. The Attempt at a Solution
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    Cosh x / sinhx in the form of e^x

    If cosh3x then e^x is substituted with e^3x ??
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    Cosh x / sinhx in the form of e^x

    1. Homework Statement I was told that coshx = (e^x + e^-x) / 2 , why cosh2x = (e^2x - e^-2x) / 2 ? 2. Homework Equations 3. The Attempt at a Solution
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    Second shift theorem

    1. Homework Statement why the f(t-1) isn't = 1-1 = 0 ? since f(t) = 1 , a=1 2. Homework Equations 3. The Attempt at a Solution
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    Limit of series

    what is the purpose of not making L =r , but make L less than r ? isn't the L is the factor = r ?
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