I have this as an online assignment and think I have the wrong answer, but the site is telling me the result is wrong and takes a percentage off my grade each time i send a wrong submission.
I am just posting an image link because that way you guys can see the picture...
Ok, the question asks:
An electron close to a large, flat sheet of charge is repelled from the sheet with a 2.1×10^−12 {N} force.
Q. find the surface charge density on the sheet in C/m^2
What i did was use the formula F = qe with 2.1e-12 for the force and 6.1e-19 for the charge of an...
A long rod, insulated to prevent heat loss along its sides, is in perfect thermal contact with boiling water (at atmospheric pressure) at one end and with an ice-water mixture at the other View Figure . The rod consists of 1.00-m section of copper (one end in steam) joined end-to-end to a length...
Ok, thanks. My work is very similar to yours--is that enough to answer the question? The reason I ask is because this is an end of chapter question, which is supposed to be one of the harder ones.
The question is
"The magnitude of the gravitational acceleration inside Earth is given approximately by g(r) = g_0(r/R_E), where g_0 is the surface value, r is the distance from Earth's center, and R_E is Earth's radius; the acceleration is directed toward Earth's center. Suppose a narrow...
OK, in an example, we are given:
"T(θ)= 2 cos^2 (θ) +sin^2 (θ) − sin (θ) + 3
=cos^2 (θ) − sin θ + 4.
Then Tθ(θ)= −2 cos θ sin θ − cos θ =
−cos θ(2 sinθ + 1)"
can anyone explain what happened from step 1 to 2--i am completely lost?
Thanks.