Parallel Definition and 1000 Threads

Homework Statement Two like parallel forces 20N and 30 N act at the ends A and B of a rod 1.5m long. The resultant of the forces will act at a point 1 90 cm from A 2 75 cm from B 3 20 cm from B 4 85 cm from A Homework Equations Torque=Force * Perpendicular distance The Attempt...

Homework Statement Consider a parallel-plate capacitor, with two square plates of side \mathrm{12.0 cm} separated by a \mathrm{4.50- mm} gap. Half of the space between the gaps is filled with a material of dielectric constant \mathrm{K = 3.40}, while the rest is filled with just air. (a) What...

Ive seen similar questions elsewhere and people say that you can consider a ray that comes not from the atom directly beneath, but an atom beneath and to the left. That ray will coincide with some ray. I don't like that interpretation because it seems contrived. Also that interpretation does...

Homework Statement So I'm trying to prove to myself that energy is conserved in the case of magnetism. Here is the set up that I'm using to get that understanding (attached image). Just to be clear the arrows represent the current lines and I am calculating a gain in PE because if I release...

Homework Statement [/B] A simple model of a railgun is a metal bar which runs on two long parallel rails. The two rails are connected to a charged capacitor with capacitance C and a resistor with resistance R. After charging, the capacitor can discharge through the circuit. You may assume that...

Background: I never learned much about RF and antennas. I've made a lot of folded dipoles for TV out of PVC and bare copper wire, with a 300::75 ohm transformer in the middle. They work great in town. My sister's TV (North of Tulsa) found twenty four stations with the antenna just sitting on...

A Power supply is connected to a parallel circuit with resistance R, there are three wires connected in parallel where the voltages would be the same,however, the current would be dived based on the number of wires and the resistance is the same. What would happen if wire (c) was placed in a...

Homework Statement By considering A x (B x A) resolve vector B into a component parallel to a given vector A and a component perpendicular to a given vector A. Homework Equations a x (b x c) = b (a ⋅ c) - c (a ⋅ b) The Attempt at a Solution I've applied the triple product expansion and...

Hello! I'm hoping someone can help me with my problem. I'm currently working on a low cost parallel plate capacitor. I used a galvanized iron as the plate material since this is a low cost material. The problem is when I measure the voltage across the capacitor, the voltage read peaks at a...

Kinetic Energy of Double Compound Pendulum and Parallel Axis Theorem Hello, there. I have a project I'm working on where I need to be able to calculate the kinetic energy of what basically amounts a double compound pendulum. However, the pivot point of the second pendulum is not at the center...

why do two diodes in parallel not share the current load?

Homework Statement An accelerometer is connected via a length of coaxial cable to an amplifier. The arrangement is modeled by: (a) a Norton generator in parallel with a capacitor (CP) representing the piezoelectric crystal within the accelerometer; (b) a lumped capacitor (CC) representing...

I manufacture heating elements and a customer wired a delta heater in parallel with a wye heater. They claim that this lowers the overall resistance of the delta thus causing this element to draw more amps than what it was designed for. I disagree and do not see how the heater is eternally...

Consider two fixed (-) source charges in free space. if you look at the field at any point created by the two charges, the resulting potential is due to the superposition of the two fields. for two batteries in parallel then, what happens to the two fields at the junction such that...

Why does parallel light focus on the focal plan when enters a thin lens at an angle θ? How to proof that mathematically?

Homework Statement How to calculate initial tension or pretension in a system of two parallel springs. F=5.33213N K1+K2=53.0597 x=0.095 Individual springs have initial tension of 0.25N so I would expect an answer of 0.5N but I can't get there. Homework Equations F=(k1+k2)x The Attempt at a...

Hey! :o Using vector methods show that the distance between two non parallel lines $l_1$ and $l_2$ is given by $$d=\frac{|(\overrightarrow{v}_1 - \overrightarrow{v}_2) \cdot (\overrightarrow{ a}_1 \times \overrightarrow{a}_2)|}{||\overrightarrow{a}_1 \times \overrightarrow{a}_2||}$$ where...

Hi, So if you wind a bifilar core in parallel and: connect it up in series, then it will have twice the N of if you connected them in parallel, i.e. The inductance is proportional to (2*N)^2 rather than just N^2, as connecting them up in parallel just increases the cross sectional area of the...

Homework Statement Two plane parallel electrodes are separated by a plate of thickness s whose conductivity \sigma varies linearly from \sigma_0 near the positive plate to \sigma_0 + a near the negative plate. Calculate the space charge density \rho_f when the current density is J_f ...

Homework Statement Two horizontal parallel conducting rods are connected such that a conducting crossbar free to slide along them has a constant current I running through it (Figure 1) . The rods are separated by a distance ℓ and are in an external uniform magnetic field of magnitude B directed...

Can anyone please tell me whether I have solved this question correctly or not. 1. Homework Statement A parallel plate capacitor has a charge of 0.040µC on each plate with a potential difference of 240 V. The parallel plates are separated by 0.20 mm of air. What energy is stored in this...

Hopefully no one minds that I post a couple questions in a row as long as I'm following the rules: 1. Homework Statement Two infinite parallel plates labelled W and X are separated by 5.2 cm. The electric potential between the plates is 150 V. An electron starts from rest at time tW and...

Homework Statement Two parallel wires are a distance 2 b apart from the origin and carry current I out of the plane of the paper. Find the magnitude and direction of the magnetic field B(y) along the y axis. Homework Equations ∫B⋅dl=μI[/B] The Attempt at a Solution If we take ∫dl = 2πr...

Hey, I have searched in the internet for the good or the negative points for a parallel- or a series circuit with a solar cell. But i didnt find something. I mean what is the difference when i connect many solar cells to a solar panel? What is better? A parallel or an series circuit? I know...

Homework Statement Two large, flat metal plates are separated by a distance that is very small compared to their height and width. The conductors are given equal but opposite uniform surface charge densities +- \sigma. Ignore edge effects and use Gauss's law to show a) that for points far...

Homework Statement In the circuit shown, a student mistakenly connects a perfect ammeter(i.e. One of negligible resistance), in parallel with one of two identical resistors. The ammeter reads 0.40A. What would the reading have been if he had correctly connected the ammeter in series with the...

This query comes from not being able to answer some one else's query :oops: it show's I have been away from textbooks and classrooms way too long ( see my signature ) I have forgotten my basics These RL circuits Now I realize A and B are just the same with the RL rotated and following that...

Hi everyone, my question is related to producing a magnetic field from an array of straight parallel wires. In my scenario, imagine the wires as being stacked into a regular array similar to the way a pile of lumber is usually stacked, so that the ends are exposed, eg: ====================...

Homework Statement A droplet of oil, carrying an extra charge of one electron, is held motionless between parallel plates separated by 1.89 cm, with a potential difference of 39.8 kV. What is the mass of the droplet? 2. Homework Equations E=0.5QV C=Q/V The Attempt at a Solution Really...

Homework Statement The electric field strength is 2.50×104 N/C inside a parallel-plate capacitor with a 1.20 mm spacing. An electron is released from rest at the negative plate. What is the electron's speed when it reaches the positive plate? Homework Equations F = eE = ma vf2 = vi2 + 2ad...

I have been reading section 3.1 of Wald's GR book in which he introduces the notion of a covariant derivative. As I understand, this is introduced as the (partial) derivative operators \partial_{a} are dependent on the coordinate system one chooses and thus not naturally associated with the...

Hello! :o When a plane contains the line $\overrightarrow{v}_1=\overrightarrow{a}+t\overrightarrow{u}$, does this mean that the vector $\overrightarrow{u}$ is parallel to the plane?? (Wondering)

My working: S3 = A S2 = B S1 = C' S0 = D' F = Sum-Minterm(0, 1, 2, 4, 5, 8) (Basically i find when is X smaller then Y) Used Kmap to arrive at A'C' + B'C'D' + A'B'D' Am i correct?

I've been looking all over and to my great surprise have not be able to find an answer to this question. What is the capacitance between to parallel plates if one plate is larger than the other? For example, the capacitance between a 1" diameter plate and a 4" diameter plate. Thanks.

If there is a parallel plate capacitor with plate area, A, plate separation, d, and a slab of copper of thickness, b, is inserted exactly halfway between the plates. How to find it's new capacitance, C', and new potential difference, V' ? Answer: V' = E(d-b) and C' = εA / (d-b) I...

Homework Statement Two identical capacitors Ca and Cb each of capacitance 6.60 http://lon-capa.mines.edu/adm/jsMath/fonts/cmmi10/alpha/100/char16.png F are connected in parallel across a CONSTANT total electric potential difference of 480 V. A dielectric slab of dielectric constant 4.65 can...

Homework Statement In a parallel spring system, the springs are positioned so that the 56N stretches each spring equally. The spring constant for the left-hand spring, kl, is 1.7Nm and the spring constant for the right-hand spring, kr, is 7.7Nm.[/B]Homework Equations Momentum Principle...

could someone explain question 10. JUST PART b)iii) http://mrmackenzie.wikispaces.com/file/view/AHpastpaper2004.pdf I got the magnitude of the magnetic field but I don't know how to find its directionI thought it might be to do with left and right hand rule? the answer is upwards could...

Hi, I'm taking a basic electricity course right now and I'm having trouble understanding a formula. The way they have their example makes no sense to me. Can anybody verify that their example is correct and explain a little bit for me? See attached file.

Homework Statement Picture provided. The current going through the resistor R1 in the figure does not change whether the two switches S1 and S2 are both open or both closed. The resistances are R1 = 14.00 Ω, R2 = 142.00 Ω, and R3 = 24.00 Ω. The voltage is V = 11 V. With this information, what...

Homework Statement The electric field between two circular plates of a capacitor is changing at a rate of 1.5 x 10^6 V/m per second. If the displacement current at this instant is Id = 0.80 x 10^-8A, find the dimensions of the plate. Homework Equations Id = ΔQ/Δt = ε0(ΔΦE/Δt) ΦE = EA Q = CV...

I am currently trying to drive a DC brushed motor, but its specs are unique enough that I haven't been able to find a suitable driver. I found one that almost fits our application but our amperage is closer to the peak then the continuous. So is it possible that I could put two of the same speed...

Homework Statement Two parallel wires both carry currents directed from left to right. A circular wire loop lies in the plane of the two wires midway between them. The currents are positive charges. Sketch the changes in the magnetic fields induced and the resultant current direction in the...

I wonder how my book did the calculation for this example $\vec{r}=<5,2-t,10+4t>$ the vector parallel to it is $\vec{a}=<0,-1,4>$ can you show the workings of this example! TIA!

Homework Statement Hey guys, this is actually a question from my roommate's homework. She gave her response and I figured I'd check it over. I have some questions too! Consider the following statement made by a physics 480 student while pondering the fact that two bulbs connected in series...

Is it possible to travel to parallel universes of many worlds interpretation of quantum mechanics?

For the transformers in parallel.. there's a relation Z1/Z2 = S2 (rated)/S1(rated) where Z1 & Z2 are the impedences while S1 & S2 are KVA ratings of the two transformers. Now why we are taking rated KVA values..?? I mean if Z1/Z2 < S2(rated) / S1(rated)... we increase S1 to satisfy the relation...

Homework Statement Explain, using Huygen's Principle, why ocean waves break parallel to the shore. Homework Equations None The Attempt at a Solution Okay, I know that the speed of the waves decreases as the water gets shallower. Therefore, since the frequency is the same, the wavelength...

Homework Statement At what angle will the electrons in the image leave the uniform electric field at the end of the parallel plates (point P) ? Assume the plates are .049 m long, E = 5x10^3 N/C and v0 = 1x10^7 m/s. Ignore fringing of the field. Homework Equations E = kQ/r^2 F=ma F= kQ1Q2/r^2...

Hi I was thinking about two parallel plates with same charges (there's no electrical field between them). How can we calculate the repulsive force? Does anyone have any ideas besides numerical integration? Thanks