Recent content by inhere

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    How Much Charge Remains on a Capacitor After 4 Milliseconds in a Circuit?

    You are simply using Q = Qo*e^(-t/tau). And tau = R*C, t = 4E-3 s. Take another look at RC circuits and the charging and discharging capacitor relations.
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    Velocity of Propagation of a wave

    The velocity of propogation is simply the distance traveled over the time of propogation. or v = t(sent to reception)/2L. The attenuation is generally defined as final amplitude over initial amplitude so A/Ao.
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    Calculating Time of Impact for Released Ballast Bag in 2D Kinematics

    I'm not sure if you're wrong, sometimes the programming behind those sites can be a bit shady, but it doesn't seem like you defined the final velocity as v=-13.9 m/s, where the initial velocity v = + 2.4 m/s. This will change your final answer.
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    Ranking the force of point charges

    You see that F = qE and F = kq1q2/r^2. From Gauss's Law the total charge enclosed is Q. You are still taking r as being the distance from the center of the sphere to the point charge. Simply make q1 = Q and substitute the different q2 values and r values and compare those magnitudes. If you...
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    Finding Spring Constants After Cutting a Spring

    Hello. Consider the spring to be like two capacitors. 1/keq = 1/k + 1/k'. So in this case we consider the entire spring with keq to be the sum of two individual spring halves that have some other spring constant k where k = k' for this problem. Doing a bit of algebra shows that k = 2*keq.[
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