Recent content by OsDaJu

Homework Statement A piston/cylinder contains helium at 500 K and 1200 kPa. It expands polytropically with n=1.667 to a pressure of 100 kPa. Find the final temperature, the specific work and specific heat transfer in the process Homework Equations U2-U1=1Q2-1W2 1W2=P2V2-P1V1/(1-n)...

That's what I think I have been asked to find, however I cannot come up with an equation. Do you have any other hints? I would like to understand the problem better. Thank you for the quick reply!

Homework Statement What is the minimum thickness of coating which should be placed on a lens in order to minimize reflection of 661 nm light? The index of refraction of the coating material is 1.40 and the index of the glass is 1.65. Hint: You must take into account the 180 degree...

Thank you, I missed that one.

Homework Statement In the 7 diagrams below, the solid arrow represents the object and the dashed arrow the image. The rectangle shows the position of an SINGLE OPTICAL ELEMENT. Match each diagram with the appropriate optical element. 1)http://img190.imageshack.us/img190/5176/92585723.gif...

Thank you!

Homework Statement A An AC generator supplies an rms voltage of 110 V at 60.0 Hz. It is connected in series with a 0.300 H inductor, a 5.80 μF capacitor and a 236 Ω resistor. What is the impedance of the circuit? B What is the rms current through the resistor? C What is the average power...

Oh sorry about that, I made a new one.

Thanks, I didn't see that one. I changed the forum to a different question. Do you think you can help me with this one?

AC Circuits II: AC Power Generator Homework Statement A An AC generator supplies an rms voltage of 110 V at 60.0 Hz. It is connected in series with a 0.300 H inductor, a 5.80 μF capacitor and a 236 Ω resistor. What is the impedance of the circuit? B What is the rms current through the...

Thanks.

Well if I take the limit as i goes to infinity then it equals zero. So the image is at infinity?

If the object is at the focal point then the object is at the same distance as the focal length, 8 cm. Is this correct? Therefore the image distance would be zero? And what would be the answer for the "word" that they are asking me? Thank you for the quick reply!

Homework Statement part1: In the Figure below a lens of focal length 8 cm is placed between a plane mirror and a pin hole. The other side of the pin hole is illuminated by a light source (not shown), so that the light passes through the hole and is then collected by the lens. If the pin hole...

Thank you!