Recent content by PhysKid45

Homework Statement There are unknown values for input voltage, but we know it is sinusoidal. There is an inverting amp connected in parallel with a non inverting amp. The goal is to find the output voltage. I have three questions. 1: if the problem states that "power rails for both opamps are...

Ok I had my pointer and my middle fingers wrong for the first one, and for the second one my thumb points in the direction of the force and curls in the direction of the B field. Thanks!

For the first one my thumb is the velocity, my pointer is the direction of the force, and my middle is the B field. For the second version I essentially point my entire hand towards velocity, and curl it in the direction of the force (curl up because the electron moves up), so the thumb is the...

https://scontent-ord1-1.xx.fbcdn.net/v/t34.0-12/17092376_1311006885612822_239104452_n.png?oh=72f2336f20f39bd399888901812eae3e&oe=58BAB2BF Hello PF friends. I know what the answer is, but I do not understand why the answer is. By the right hand rule I put my thumb west, but pointer up, and...

I feel like I mostly understand. Essentially, the most waves happen at the peak, but there are other waves outside of that? Some of those waves are within the light spectrum, and according to the temperature of the star can appear blue - which has nothing to do with peak wavelength the problem...

For my astronomy class we were asked a question about a star that is 50,000K and it's peak wavelength. This was easy enough to find using Wein's law. The answer, however, is well below a human's threshold for visible light and we theoretically would not be able to see the star, but apparently it...

Hey, so apparently the answer was in microfarads but I was entering it in farads, but thanks for the help!

Homework Statement Two 10-cm-diameter metal disks separated by a 0.64-mm-thick piece of Pyrex glass are charged to a potential difference of 1100 V . What is the surface charge density on the disks? What is the surface charge density on the glass? Homework Equations C=(e_0A)/d C=Q/V charge...

All numbers presented are correct. I am not sure what you both mean by using the precise formula vs. approximating as an infinite sheet.

Yup. I ended up guessing correctly, in an attempt to figure out the second part of the problem and the correct answer was 2.7*10^6 which I do not understand. Any ideas on how it would work out to be that?

Hey student100, I am checking sig figs. It tells me to use 2

Homework Statement Two 2.4-cm-diameter disks face each other, 1.9 mm apart. They are charged to ± 12 nC . What is the electric field strength at the midpoint between the centers of the disks? Homework Equations The Attempt at a Solution Q=12*10^-9 A= Pi * r^2 = pi*(.012)^2 Q/A=...

Hey everyone, I'm a Physics major in NC. I like dogs, and physics.