Net Definition and 1000 Threads

net force exerted on the system quick question- halllp lol. Homework Statement The vector position of a 3.10 g particle moving in the xy plane varies in time according to the following equation. r1 = (3i+3j)t + 2jt^2 At the same time, the vector position of a 5.15 g particle varies...

Homework Statement if I have two charged particles A and B and are distanced 8 cm apart. At a point 4 cm from A, the net electric field is 0. The charge of A is 40 nC. What can we conclude about the charge of B? Homework Equations The Attempt at a Solution From my point of view...

Homework Statement Water stands at depth d behind a dam of width w . Find an expression for the net force of the water on the dam. Express your answer in terms of the variables w,d,p (density), and appropriate constants. Homework Equations P=F/A or pressure=Force/Area Hydrostatic...

Homework Statement Four particles form a square. The charges are q_1 = q_4 = Q and q_2 = q_3 = q. (a) What is \frac Qq if the net electrostatic force on particles 1 and 4 is zero? (b) Is there any value of q that makes the net electrostatic force on each of the four particles 0...

In the figure below, the charge on a neutral isolated conductor is separated by a nearby positively charged rod. What is the net flux through each of the five Gaussian surfaces shown in cross section? Assume that the charges enclosed by S1, S2, and S3 are equal in magnitude. Surface 1...

Hello Homework Statement I have this problem, even though it might seem very simple. A boy falls from a distance and lands on a net. When he reaches the net, it de-accelerates him with 4*g. The question is: What amount force does the boy exert the net? The Attempt at a Solution I would say...

Homework Statement The net energy is given by: E_N=-\frac{A}{r}+\frac{B}{r^n} where A, B , and n are constants and r is the interionic separation. Calculate E0 in terms of A, B, and n by the following procedure: 1. find dEN/dr 2. set this expression equal to zero and solve for...

I'm doing a lab, and I need to determine the centripetal force of a ball tethered to a string, rotating around at a constant acceleration horizontally. In this instance, is the only force in the problem the centripetal force, in which case would also be the net force, or is there also a normal...

What a load of dirt bags, i was watching a film hosted by megavideo, and when it came to the good bit a notice poped up saying, you have watched 72 mins please try again in 52mins. So, i found the same film in two halves hosted by yoko, so i selected the last half and all was okay for a...

Homework Statement Find net torque. Homework EquationsT = F(d) and T = F(d)sinx Torque = T Force = F d = distanceThe Attempt at a Solution 100(0) - 200(4)sin40 - 120(14) + 150(8) = -994.2 Nm Did I do this correctly? Notice I crossed out the 400N also because I think that it does not...

Homework Statement http://online.physics.uiuc.edu/cgi/courses/shell/common/showme.pl?courses/phys212/oldexams/exam1/sp08/fig4.gif Two curved rods each have charge +Q uniformly distributed over their length. Which statement best describes the electric field due to these two rods at the...

I've been confused about work. I know it equals F x D. But what is F? Is it the netforce or the force being exerted. If you are pushing up an object up an incline with 200N and the opposing force of gravity + friction is 100N for D=20m. Is Work, Fnet x D or 200N x D? Does the same apply...

Homework Statement At a certain instant of time, a 1200 kg car traveling along a curve 250 m in radius is moving at a speed of 10 m/s but is slowing down at a rate of 2 m/s2. Ignoring air friction, what is the total static friction force on the car as a fraction of its weight at that instant...

Homework Statement If wind blows at 35 m/s over a house, what is the net force on the roof if its area is 240 m2 and is flat? Homework Equations Pat + 1/2 * pair * v^2 The Attempt at a Solution wind velocity - v - 35 area of roof - A - 240 density of air - p - 1.29 atmospheric...

Consider 3 force vectors F1, F2, and F3. The vector F1 has magnitude F1 = 36N and direction θ = 110°; the vector F2 has magnitude F2 = 22N and direction θ = - 140°; and the vector F3 has magnitude F3 = 28N and direction θ = 20°. All the direction angles θ are measured from the positive x axis...

Homework Statement True or false: "Given that the same force acts on particle A and B, If object B covers the same distance in less time than particle A, object B is less massive than object A" Homework Equations net force = mass(acceleration) The Attempt at a Solution I believe...

Hi Does anybody know if there is an engine on the net that will solve PDEs. I'm looking for the solution of a linear first order PDE Thanks

Homework Statement I need to find force between two dipoles. I was thinking of finding F between all the four charges separately and then using superposition principle to get the net charge. but is there an easier way. Say, if I use the formula of E (dipole) for one dipole and multiply it...

This is just a general question- Given a beginning and ending velocity, and distance that the object travels, would the average net force be the change in kinetic energy divided by the distance? (Using energy methods only) I think I've also seen avg force calculated with momentum...

Homework Statement If you swing a ball in a horizontal circle around your head, what is the direction and magnitude of the net force acting on the ball? Homework Equations The Attempt at a Solution I said none because the ball is moving at a constant velocity. Is this correct...

Homework Statement A crate is pulled to the right with a force of 92.3 N, to the left with a force of 116.8 N, upward with a force of 508.8 N, and downward with a force of 248. 6 N What is the net external force in the x direction? Answer in units of N Homework Equations When I...

Homework Statement see problem 4 attachment Homework Equations see problem 4 attempt attachment The Attempt at a Solution see problem 4 attempt attachment

Homework Statement The bent wire shown in the figure below lies in a uniform magnetic field. Each straight section is 2.0 m long and makes an angle of θ = 65° with the x axis, and the wire carries a current of 2.0 A. (a) What is the net magnetic force on the wire in unit-vector notation if...

Homework Statement A 15.8 kg block is dragged over a rough, horizontal surface by a constant force of 90.9 N acting at an angle of angle 28.6 above the horizontal. The block is displaced 22.8 m, and the coefficient of kinetic friction is 0.18. What is the net work done on the block...

Homework Statement A square of side 1cm has a charge of q= 1uC at its center. The four vertices of the square have charges distributed equally. Calculate the net force on the central charge. A. Find the distance from the central charge to the equidistant charges B. Find the force of...

Homework Statement A student drags an object across a laboratory table at constant velocity using an applied force of 12 Newtons. Calculate the frictional force 2. a horizontal force of 15 Newtons pulls a 5 kg block along a horizontal surface. If the force produces an acceleration of 2...

Two point-like objects carry charges of q1 = +4C and q2 = -3C and are separated by a fixed distance of 50 cm. (a) Determine the point (other than infinity) at which a point-like positive charge will experience zero net electrostatic force due to the two fixed charges. q1 = +4C ...... q2 =...

Homework Statement 5. The air pressure at sea level on a cold day is P0 = 1.013 x 105 Pa. At 10.0 km above sea level the air pressure is 0.30 P0 ; however a commercial jet plane keeps the pressure in the passenger and crew section at 0.75 P0 . If the surface area of the cabin structure is...

Homework Statement A 4.60 kg counterweight is attached to a light cord, which is wound around a spool. The spool is a uniform solid cylinder of radius 7.00 cm and mass 1.00 kg. (a) What is the net torque on the system about the point O? Magnitude: 3.16 N·m (b) When the...

Homework Statement NaNO3 + H2O Homework Equations The Attempt at a Solution NaNO3 + H2O -> Na+OH-+NO3-+H2O

http://img225.imageshack.us/img225/6275/25534482ej9.jpg http://g.imageshack.us/img225/25534482ej9.jpg/1/ attempt: Tnet = F x r = (40N + 30N) x .03m but something is wrong here...i don't know wht

1. A beam consisting of around 1.0 1015 electrons per second, each of mass 9.1 10-31 kg, paints pictures on the face of a TV tube. Assuming that the electrons are absorbed by the screen and exert an average net force on it of 0.9 10-7 N, what is their average speed at impact? 2. Favg =...

Homework Statement 1) You mix a 45.0 mL solution of 0.250 M Al(NO3)3* with a 30.0 mL solution of 0.600 M K2C)3. (a) Give the net ionic equation. (b) How many grams of the precipitate forms? (c) After the reaction, what is the concentration of the excess ions? *All of the numbers in the listed...

1. I need to display the molecular & net ionic equations for the following reactions: 2. NH4NO3 > Na2CO3 NH4NO3 > NaBr NH4NO3 > Na2SO4 Ba(NO3)2 > NaBr Ca(NO3)2 > NaBr Ca(NO3)2 > Na2SO4 3. I don't really have any attempts because I'm completely lost on how to start...

Homework Statement A 10 kg box rests on a horizontal surface. The coefficient of static friction is 0.85. If a force is applied to the object at 30° above the horizontal, what is the minimum magnitude this force must have in order for the box to slide? Homework Equations Fnet = ma Fs = usFn...

Homework Statement For each of the following situations, identify those for which a reaction is liely to occur. For those that do occur, write a net ionic equation a) Chromium dipped into silver nitrate. b) B) Gold immersed in hydrochloric acid. c) Nickel pellets dropped into calcium...

Homework Statement A 930 kg car is pulling a 320 kg trailer. Together the car and trailer move forward with an acceleration of 2.16 m/s2. Ignore any frictional force of air drag on the car and all frictional forces on the trailer. determine the net force on the car. Homework Equations f...

Just eant to comfirm that the net ionic equation for the reaction in which calcium carbonate is precipitated when aqueous solutions of lithium carbonate and calcium chloride are mixed is: Ca2+ (aq) + CO32- (aq) => CaCO3 (s)

1. Homework Statement [/b] A 76.0 kg diver falls from rest into a swimming pool from a height of 6.9 m. It takes 1.44 s for the diver to stop after entering the water. Find the magnitude of the average net force exerted on the diver during that time.

Homework Statement I need some help with a Physics lab. My teacher wasn't there the only chance I could ask him. I don't understand how to prove that the net force is zero when you have the three forces in different directions. For example, the first force is 9.7 N [down], the second is 5.3 N...

Homework Statement Find the net ionic equation: 2HClO(aq)+Ca(OH)_{2}(aq)\rightarrow 2H_{2}O(l)+Ca(ClO)_{2}(aq)[tex] ...I would show my answer but the forum is not working well right now.

In a problem whereby you want to calculate the net force of the rope lifting a box, and there is something in the box, whether you take into account the normal force. The forcees would be the tension of the rope, and the weight of the box and the object inside. To caculate the net force of the...

Homework Statement A 1270-kg car coasts on a horizontal road with a speed of 18.1 m/s. After crossing an unpaved, sandy stretch of road 28.4 m long, its speed decreases to 11.3 m/s. Was the net work done on the car positive, negative, or zero? b. Calculate the magnitude of the average...

The position of a 2.75x10^5N helicopter under test is given by r=(0.020m/s^2)t^3i + (2.2m/s)tj - (0.060m/s^2)t^2k Find the net force of the helicopter at t=5.0s express the vector F in the form Fx, Fy, and Fz so far i plugged in 5.0 to each component in the r equation which gave me...

Homework Statement I am having some trouble finding out exactly how I could find net acceleration. I know how to use it for finding force of drag, and other formulas, but for a project I need to actually find the net acceleration of me throwing a baseball. This is a sample problem, that I...

Please tell me the definition of NET FORCE Thanks!:smile:

The position of a 2.5x10^5N training helicopter under test is given by r=(0.020m/s^3)t^3i + (2.2m/s)tj-(0.060m/s^2)t^2k , find the net force of the helicopter at t=5.0s express F in the form Fx Fy and Fz F=ma F=Fx+Fy+Fz so far i plugged in t to each component to get 2.5m, 11m, and...

1. Homework Statement Can you see the picture? "An accident victim with a broken leg is being placed in traction. The patient wears a special boot with a pulley attached to the sole. The foot and boot together have a mass of 4 kg, and the octor has decided to hang a 6 kg mass from the rope...

I drew these pictures, so some letters came unclear, I will clarify them later in parentheses. Chp9,46, the diagram represents two small charged spheres, A and B, 3 meters apart. Each sphere has a charge of +2.0*10^-6 coulomb. (The point in the middle is y) If a positive charge is placed at...

Homework Statement Three forces are exerted on an object placed on a tilted floor in the figure (Intro 1 figure) . The forces are measured in Newtons. (Figure attached below) a) Assuming that forces are vectors, what is the component of the net force parallel to the floor? B)What is...