Net Definition and 1000 Threads

Homework Statement 13 equal charges are placed in the corners of a regular 13-sided polygon. What is the force on a test chrage at the center? Homework Equations principle of superposition symmetry The Attempt at a Solution I am not sure if the net force is 0 or not. Had the polygon...

I've been searching everywhere for an answer to this question but haven't been able to get one. Let's say we're coming two things at 12% compounded annually. A's investment, salvage, life, and expense/year are given as: $50,000 ; $10,000 ; 11 ; $5000 While B's are: $40,000 ; $0 ...

First time in these forums so nice to meet everyone Homework Statement A dynamics cart is pulled from rest by a net force of 1.2M [Forward]. The cart moves 6.6m, reaching a velocity of 3.2m/s [Forward]. Homework Equations F=ma The Attempt at a Solution I tried using the...

Homework Statement Prove that there is no charge inside a SOLID conductor, and thus, charges are only on the surface. Homework Equations Gauss's Law (Maybe) The Attempt at a Solution I have been doing some research on it on some websites. It mentioned that, "you make a Gaussian surface...

Homework Statement In a current-carrying wire, the total net charge in the metal is zero. Why does the wire experience a force when placed in a magnetic field? Homework Equations The Attempt at a Solution The reason for the force is the motion of the electrons, not their...

This is just a scenario I have been pondering. Imagine one took a board and placed it on a pivot in perfect equilibrium. Next they added two 10KG weights 1 inch out, on each side of the pivot. The board would probably not snap with the weights at this distance, but let's say one were to...

I know that net torque is the sum of torques in a given situation. So take this as an example: If I used a wrench to turn a nut counterclockwise and it succesfully moves, is the net torque going to be non-zero? If so, then can someone please give me an example where the net torque can be zero...

Hi all, I have a conceptual question about the net force of a rotating or spinning ball attached to a string. If we have a situation such as a tether-ball game where the ball is being swung around a string at an angle to the vertical, is the net force the tension in the string, or the...

Homework Statement When writing chemical formulas in Mastering, indicate the physical states using the abbreviation , , or for solid, liquid, or gas, respectively. Use for aqueous solution. Write the total ionic equation (also known as the complete ionic equation) for the reaction of...

Homework Statement A charge of +2q is placed at the origin and a second charge of -q is placed a x = 3cm. Where can a third charge +Q be placed so that it experiences a zero force? Homework Equations F=kQ1Q2/r^2 The Attempt at a Solution OK I thought I had this until the roots of...

Homework Statement https://fbcdn-sphotos-a.akamaihd.net/hphotos-ak-prn1/553004_1959186995753_1725123128_934768_456680196_n.jpg In case the words are too small: I2= 6.61I1 The net magnetic field at center of loop is 0. I'm looking for the radius of the loop Homework Equations for...

Homework Statement The attached figure shows, in cross section, two long parallel wires that are separated by distance d = 18.6 cm. Each carries 4.34 A, out of the page in wire 1 and into the page in wire 2. In unit-vector notation, what is the net magnetic field at point P at distance R =...

Homework Statement A long wire carrying 100 A is perpendicular to the magnetic field lines of a uniform magnetic field of magnitude 5.0 mT. At what distance from the wire is the net magnetic field equal to zero? Homework Equations B = iμo/2∏R The Attempt at a Solution I...

If i have a shaft & I'm applying a driving torque D at one end & at other end there is resisting torque R due to bearing friction, etc. Then if D>R, i have net torque = moment of inertia times angular acceleration. Since the ang. accln is constant with respect to time, will the ang. speed of...

Homework Statement Write balanced molecular and net ionic equations for the reaction of aqueous sulfuric acid with sodium hydroxide.Homework Equations H2SO4 + NaOH --> The Attempt at a Solution H2SO4 + NaOH --> H2O + NaSO4Please apologize any mistakes I make in trying to post this...

Homework Statement In cases A and B shown there are two positive charges +Q each a distance s away from a third positive point charge +q. Is the net electric force on the +q charge in case A greater than, less than, or equal to the net electric force on the +q charge in case B? Explain...

How would I find the net force given the angle of the applied force, the mass, and the magnitude of the force? Homework Equations F=ma I need to fit an angle in that equation somehow.

Homework Statement An object is being swung vertically on a stick. What is the net force at the bottom? The mass of the object = 2kg. g= 9.81ms-1. v = 6ms-1 at the bottom. Homework Equations F= mg Fcentripetal = (m*v^2)/r The Attempt at a Solution I just need to know if i...

Net force (Diagrams incl) Please check my solutions :) Homework Statement Calculate the net force acting on each object indicated in the following diagrams. Show your work. The diagrams are in attachment, you don't have to download them to view them :) Homework Equations...

Homework Statement An aqueous solution of chromium(III) iodide is mixed with an aqueous solution of lead(II) nitrate (a) Write the molecular equation for this reaction (b) Write a complete ionic equation for this reaction (c)If this reaction occurs, write the net ionic equation I'm...

Homework Statement • If we add a third block, leaving the 10 N force the same, what happens to f3, the net force on the 3 kg block? A. Increase B. Decrease C. Stay the Same D. Not Enough Info. Homework Equations F net = m * a The Attempt at a Solution Ignore the...

Question is: A mother weighing 58.2kg is holding onto the hand of her daughter who weighs 35.5kg. If the father grabs the hand of the mother and pulls with a force of 100N, how much net force does the daughter experience? Iv'e been looking through my Physics formula and can't even find...

Even if I use correct method or code for deleting files and folders, when debugging I get error saying that it cannot access file and hence cannot delete it. What setting of computer I should inprove to enable the delete feature through visual basic 2008

Homework Statement A particle is moving along the x-axis subject to the potential energy function U(x) = 1/x + x2 + x - 1. Determine the x-component of the net force on the particle at the coordinate x= 3.29m. Homework Equations U(x) = integral(F(x)dx) The Attempt at a Solution...

Homework Statement You have to calculate the net force acting on a wagon that is being pulled by two separate forces. Roping being pulled: 12N /32° |-----------------| / | |------------ |-----------------| \...

Homework Statement Two charges are placed on the x axis. One charge (q1 = +8.36mC (microC)) is at x1 = +2.74cm and the other (q2 = -20.2mC (microC)) is at x1 = +9.05cm. Calculate the net electric field at x = 0cm. Homework Equations E= kq/r^2 The Attempt at a Solution I tried...

I want to apologize ahead of time for my apparent inability to get LaTeX to display properly. Homework Statement λ = 3.8 x 10^(-6) C/m R = 32m r = magnitude of the hypotenuse (the book's convention, a poor choice IMHO) r = \sqrt{R^2 + x^2} k = 8.988 x 10^9 P:(0,-32) cosθ = x/r a→∞...

Homework Statement A point charge is placed at each corner of a square with side length a . The charges all have the same magnitude . Two of the charges are positive and two are negative, as shown in the following figure. my figure: (image each charge represents a corner of the square)...

Trying to learn the basics of capacitors, but I'm hung up on a conceptual issue. It seems that capacitors must be charged up, generally with the help of a current from outside the capacitor, such as a flow of electrons that pile up on one of the plates. So in that sense, the capacitor must be...

Homework Statement In a region of two-dimensional space, there are three fixed charges: +1 mC at (0, 0), -2 mC at (16 mm, -6 mm), and +3 mC at (-6 mm, 20 mm). What is the net force on the -2-mC charge? -magnitude -direction (° counterclockwise from the +x-axis) Homework Equations F =...

Homework Statement Three positive particles of equal charge, +11.5 µC, are located at the corners of an equilateral triangle of side d = 13.0 cm (Fig. 16-50). Calculate the magnitude and direction of the net force on each particle. Image is here...

Homework Statement In a region of two-dimensional space, there are three fixed charges: +1 mC at (0, 0), −2 mC at (12 mm, -7 mm), and +3 mC at (-6 mm, 18 mm). What is the net force on the −2-mC charge? magnitude direction ° counterclockwise from the +x-axis Homework Equations...

Homework Statement A charge, Q2 = -7.00x10^-6 C, is 8.00 cm to the right of charge Q1 = 6.00x10^-6 C. Where can a third charge be placed, along the line connecting Q1 and Q2, such that it experiences no net force? Give distances relative to Q1 and use a plus sign if the third charge is to the...

Homework Statement A point charge is placed at each corner of a square with side length a. The charges all have the same magnitude q. Two of the charges are positive and two are negative, as shown in the following figure. The two positive charges are on top and the two negative charges...

Homework Statement One charge of (+5µC) is placed in the air at exactly x = 0, and a second charge (+7µC) at x = 100cm. where can the third charge be placed so as to experience zero net force due to the other charges? Homework Equations F=KQ1Q2 / D^2 The Attempt at a Solution Q1 =...

Homework Statement A metronome is a device used by musicians to help them adjust the timing of their music to a standard number of beats per minute. The position of the moveable slider determines the frequency. It is possible to build a simple mechanical metronome using a light stick...

Homework Statement The Moon is 3.9*10^5 km from Earth's center and 1.5*10^8 km from the Sun's center. The masses of Earth and the Sun are 6*10^24 and 2*10^30 kg, respectively. a. The ratio of the gravitational fields due to the Sun and Earth at the center of the moon is: 1) 2300 2) 230...

Homework Statement Three charges with magnitude 8 × 10^{-4} C are located at (1, 0), (0 , 0), and (-1, 0) meters. The middle charge is negative, and the other two positive. What is the net Coulombic force exerted by them on a negative 8 × 10^{-5} C charge at (0, 2)? k = 9.0 × 10^9 N∙m^2/C^2...

Homework Statement Three point charges lie along a straight line as shown in the figure below, where q1 = 6.60 µC, q2 = 1.41 µC, and q3 = -1.9 µC. The separation distances are d1 = 3.00 cm and d2 = 2.00 cm. Calculate the magnitude and direction of the net electric force on each of the...

Homework Statement Four objects, each with a positive charge of 1.0 3 1025 C, are placed at the corners of a 45° rhombus with sides of length 1.0 m, as in Figure 13. Calculate the magnitude of the net force on each charge. Homework Equations F = Kq1q2/r^2 The Attempt at a Solution

Homework Statement I am trying to help a friends daughter understand her physics homework. We have been stumped for hours! We don't really understand what her teacher was talking about and what we have figured out has mostly come from google. The problem is (this is drawn out no real...

Homework Statement What is the net work done if an object is raised 5m, carried horizontally 8m, lowered 2m, and then lowered 3m if there is no friction? Homework Equations W=F x d (force times distance) work done overcoming gravity: W=mgh (mass times gravity times...

Need to find the net force and the average force... 1. Homework Statement A bullet of mass 12 g strikes a stationary fixed block of wood at a speed of 400m/s, penetrating to a depth of 3.0cm. Calculate the average net force acting on the bullet while it is in the wood. Calculate the average...

Homework Statement There are three point charges, q1 has a magnitude of 3.00mC (the sign is not known) and is 5.0cm away from P and 13.0 cm away from q2. P is 12.0cm away from q2 and the three points form a triangle. The net electric field at point P is entirely in the negative y-direction...

Homework Statement Two charges, q1 and q2, are separated by a distance r. Find the position at which a third charge, q3, can be placed so that the net electrostatic force on it is zero. Homework Equations Coulomb's Law: F = (kq1q2)/r122 * (r12hat) The Attempt at a Solution I was...

I will be thankful if anyone clears the following doubts in the concept of pre-emphasis in a FM transmitter in a simple way. 1. In the higher secondary physics textbook published by Tamil Nadu government, regarding the pre-emphasis net work, it is given as follows:"Since the modulating AF...

A bullet of mass 20 g strickes a fixed block of wood at a speed of 320m/s. The embeds itself into the block of wood, penetrating to a depth of 6.0cm. Calculate the average net force acting on the bullet while it is being brought to rest.

Homework Statement Here is the question: "A ball moves through the air, and experiences a force of air resistance, in addition to the force of gravity. While it moves, its total mechanical energy decreases by 15J, and its gravitational potential evergy decreases by 25J" A: What is the...

Homework Statement How long would a day have to be on Earth if there was zero net acceleration at the equator? Homework Equations Ac=v^2/r Vrotational=Ac / Radius of earth g = 9.8m/ss T = Earth's circumference / rotational velocity V= SQRT(Ac*R) Earth's Radius = 6.37x10^6 Earth's...

Homework Statement A small ball of mass m = 0.150 kg is sliding along a frictionless loop-the-loop. The loop-the-loop is standing on a table such that the plane of the loop is vertical. The loop has a radius of r = 0.200 m. What is the magnitude of the net force acting on the ball when it...