Recent content by Name15

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    Flowmetry: find height of fluid in cylinder

    Homework Statement A cylinder with varying diameters is being filled and emptied at the same time. The time is measured. I know Flow rate into cylinder. How do I find the height of fluid in the cylinder at a particular time? The diameter of the hole is 0.005m. The diameter of the bottom of the...
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    D'Alembert solution of wave equation on semi infinite domain

    Quick question regarding d'Alembert, for a function f(x)=x at time t=1 and c=1, should I get a translation of 1 or 0.5? I thought the ct should be multiplied by the 0.5 from the d'Alembert solution giving a translation of 0.5, but something I read tells me otherwise..
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    D'Alembert solution of wave equation on semi infinite domain

    So to get a range from 2.5(-2) to 2. 5(-4) , I should use -f(-x), which gives -2.5(5+x)? If i plug in -1 and -3 into this i get the range you mentioned.
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    D'Alembert solution of wave equation on semi infinite domain

    Ok I think I'm getting there. So i only want solutions in the negative axis, and -x wouldn't work since it'll give a positive solution for negative x values. However, 2.5(x-5) (-3 <x ≤ -1) would work as this gives a negative solutions?
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    D'Alembert solution of wave equation on semi infinite domain

    Thanks for the response. I'm still a little confused, I thought I these were the odd functions for x is less than 0: -x (-1 <x ≤ 0) 2.5(x-5) (-3 <x ≤ -1)
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    D'Alembert solution of wave equation on semi infinite domain

    Homework Statement Wave equation: ytt=yxx Initial conditions: Y(x,0) =f(x) = x (0 ≤ x < 1) 2.5(5-x) (1 ≤ x < 3) 0 (Otherwise) and yt(x,0) = 0 Boundary condition: y(0,t) =0 Semi infinite domain: 0 ≤ x < infinity Homework Equations d'Alembert solution...
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    R-2R ladder D/A converter problem

    The problem is only C and D are 0V (A and B are both 5V), so I don't know how to do this problem. I've only been taught binary inputs where there is only one input.
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    R-2R ladder D/A converter problem

    Hi, I don't understand why Vref = 0. I have 2 inputs; 5V and 2.5V. I thought one or both of those would be Vref. Also if Vref is zero, wouldn't Vout also be zero?
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    R-2R ladder D/A converter problem

    Homework Statement Simplify in order to find voltage output. Homework Equations Vout= -Vref x (A + B/2 + C/4 + D/8) The Attempt at a Solution Firstly is this even correct? Secondly, I have 2 voltages (2.5V and 5V), what should I do now? what is my Vref?
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    Engineering DC motor - power calculations

    Hi, thanks for your help! But why would I find Torque and current at 100 rad/s and not 126 rad/s? Continuing from your calculations: I find Torque = (0.749 Vs)x(39A) = 29.2 Nm. So using P=Tw; Power = 29.2 x 126 rad/s = 3681 W. Power input to motor = (39 x 110) = 4290 W. So power loss is (4290 -...
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    Engineering DC motor - power calculations

    Homework Statement A permanent magnet DC motor has an armature resistance of 0.4 Ohms. When a voltage of 110 V is applied to the motor it reaches a steady-state speed of rotation of 126 rad/s and draws 39 A. (a) Find the power loss in the armature (b) the power input to the motor I really...
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    Kinetic/Potential energy of spring mass system

    q1 is distance from wall to m1 q2 is distance from wall to m2
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    Kinetic/Potential energy of spring mass system

    Homework Statement Question: Does the force F(t) acting on mass m1 affect the equations for kinetic and potential energy of the system? Homework Equations F(t) is known V(q) is potential energy | T(q) is kinetic energy The Attempt at a Solution I think PE is not affected. I think KE...
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    Engineering Calculate phasor of voltage in circuit

    just A, which is 10v? so Vs is simply 10v?
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