Friday
December 6, 2013

# Posts by Robert

Total # Posts: 741

Linear Algebra
Knowing u = (4,0,-3), v = (x,3,2) and that the orthogonal projection of v on u is a vector of norm 6, determine x. Thank you

science
1.How many meters away is a cliff if heard one half second after the original sound? Assume that sound travels at 343m/s on that day

Physics - Electromagnetism 2
Two coils, held in fixed positions, have a mutual inductance of 165 µH. What is the peak emf in one coil when the current in the other coil is I(t) = 16.0 sin(1.15 103t), where I is in amperes and t is in seconds? Just a few hints on how to start it off would be very app...

Physics - Electromagnetism
An inductor in the form of a solenoid contains 440 turns and is 15.8 cm in length. A uniform rate of decrease of current through the inductor of 0.421 A/s induces an emf of 175 µV. What is the radius of the solenoid?

Physics 2
thanks. It's all good, I understand your approach and I really appreciate it!

Physics 2
thank you very much drwls, this is a question from a sample exam, getting ready for my finals tomorrow!

Physics 2
the character that doesn't show up is the emf (E)

Physics 2
Show that during the charging of the capacitor in an RC circuit, the charge of the capacitor, as a function of time, is: q(t) = C(1 – e-t/RC)

Physics - Electromagnetism
A charge +q is at the origin. A charge –2q is at x = 2.00 m on the x axis. For what finite value(s) of x is (a) the electric field zero? (b) the electric potential zero?

enviroment
The surroundings or conditions in which a person, animal, or plant lives or operates.

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