Recent content by jim the duke

Vcap (t) = (q(t))/C Eel = ½ CV2 EMF = Vbat – L (di(t))/dt f = 1/(2π√LC)

Sorry you've lost me

Energy stored in the oscillations of the solenoid.

Homework Statement Trying to calculate capacitance on an LC circuit Homework Equations L = 1.0H (solenoid inductance) i = 3.0 Ma (current in circuit) Q = 30μC (charge on capacitor) E = 4.5μJ (energy in oscillations) The Attempt at a Solution All I'm after is an equation for...

m = 2kt / v^2

sqrt v = sqrt 2kt / m

Just need some help rearranging this equation to make M the subject, thanks v = sqrt 2kt / m

V= SQRT 2gl(1-cos∅max)

oops!

SOLVED! I used V1 x R1 / R2 = V2 then used the velocity of V2 against the circ of Planet A's new radius to give the answer, yipee!

Homework Statement Planet A (at X meters) completes 1 full rotation (Y sec). Planet A then shrinks to (X2 meters) What is its rotation speed now. Conservation of angular momentum Homework Equations T=2pi/w W=V/r The Attempt at a Solution I found how to reverse engineer the...

Im lost, i give up

But i still have no figure for Mass so i cannot calc - KE = 1/2mv^2

How do i get the speed from that equation though?

Ok so now what - total mech en = pot en + kin en What step do i take next?