Recent content by wakejosh

any help? my brain is melting.

Homework Statement In order to produce a sustained interference pattern by light waves from multiple sources, which of the following conditions is sufficient? a. the sources are coherent b. the sources are monochromatic c. no more than two sources are allowed d. three or...

Homework Statement A simple magnifier, like the one used by the legendary Sherlock Holmes to look for clues at a crime scene, uses a: a. converging lens to form a real image b. converging lens to form a virtual image c. diverging lens to form a virtual image d. diverging lens...

looking at this more I think i need an equation. I don't have a book so can someone show me the equation I am looking for?

Homework Statement An object and a screen are separated by 20 cm. A convex lens is placed between them, 5 cm from the object. In this position it causes a sharp image of the object to form on the screen. What is the focal length of the lens? The Attempt at a Solution wouldn't it just...

well, it tells me that A and B are correct, but I'm just not totally sure if C is correct, but since I don't have any options to say that A and B are correct, then I am thinking D has to be the correct answer, and that wire length is also important.

Homework Statement The average power in an Alternating Current (AC) circuit with effective voltage V and effective current, I, is given by which of the following? (Note: effective and RMS are the same) a. 0.5 x VI b. VI c. 2.0 x VI d. 4.0 x VI e. V2I The Attempt...

Homework Statement 15. According to Lenz's law, the direction of an induced current in a conductor due to a change in the magnetic field near the conductor will be that which tends to produce which of the following effects? a. Enhance the effect which produces it b...

typo, meant to put: 20 V / 5 ohms = 4 A

Homework Statement The force exerted on a current carrying wire located in an external magnetic field is directly proportional to which of the following? a. current in the wire b. magnetic field strength c. length of the wire d. answers a, b and c are all correct e. none of...

Homework Statement you measure a 20v potential difference across a 5 ohm resistor. what is the current? The Attempt at a Solution 20 v/5 ohms = 4 v is this correct? thanks.

Homework Statement What is the value of 3.0 coulobms per second in Amps? The Attempt at a Solution amps are coulombs per second, so its just 3 right? I just want to make sure this isn't some kind of trick. thanks for any input.

https://www.physicsforums.com/showthread.php?t=167353 go to that thread, I made it earlier today. It should get you going.

I looked it up in several areas on the web but nothing really helped, there is no definition in my physics book. anyway, I had a question about the Hubble telescope and I found its resolution to be about 0.1 arc-seconds . Thats great and all but what does that mean really? for example, how...

I found this in my book / on the web as well: In 1801, Thomas Young successfully showed that light does produce a two-point source interference pattern. In order to produce such a pattern, monochromatic light must be used. Monochromatic light is light of a single color; by use of such light...