1. A coin is located 19.6cm to the left of a converging lens
(f = 16.5cm). A second, identical lens is placed to the right of the first lens, such that the image formed by the combination has the same size and orientation as the original coin. Calculate the separation between the lenses...
An oscillating LC circuit consisting of a 7.5 nF capacitor and a 4.4 mH coil has a maximum voltage of 2.0 V. What is the maximum current through the circuit?
I got 1.5x10^-8 C for the max. charge.
Nevermind, I got it, but the next problem is giving me a bit of trouble:
If E = 7.5 volts and r = .45 ohms, find the minimum value of the voltmeter resistance R_V for which the voltmeter reading is within 1.0% of the emf of the battery.
I am given the following equation to work with...
Here is the question, for reference:
I have two equations but am having trouble solving them for V, clearly by eliminating I
E-(I*r)-(I*R_V)=0
V_ab=E-(I*R)
Any help would be appreciated, thanks.
That's what I calculated initially, but the computer program won't take it, which led me to believe there was error in my calculation. Thanks for the help, I greatly appreciate it. I'm not sure what I'm going to do about answering the problem, but it's nice to know I had it right to begin with.
The equation for resisitivity is R=rho*(L/A), and the equation for current is I=V/R. So for the R equation I plugged in the numbers, changing cm to .1 m, and got 30 ohms. I then divided 110 volts by 30 and got 3.7 (rounded to two sig figs), and my answer is not being taken as correct. The...
Thanks. I only get one shot at an answer (it's an online-based assignment), so I would appreciate any response saying if this is correct or not, and what I did wrong if it is incorrect:
sqrt((2(h_0-h_1))/(m))=v