Net Definition and 1000 Threads

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 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...

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...

Homework Statement A rod of length l with a uniform charge per unit length lambda is placed a distance d from the origin along the x axis. A similar rod with the same charge is placed along the y axis. Determine the net electric field intensity at the origin.Homework Equations Electric Field...

Homework Statement Three positive point charges are arranged in a triangular pattern in a plane, as shown below. The Coulomb constant is 8.98755*10^9 N · m^2/C^2. http://img150.imageshack.us/img150/1052/electricforceproblemqp7.th.jpg http://g.imageshack.us/thpix.php Find the magnitude...

Does the ball clear the net?? Please help, thanks in advance? A tennis player hits a ball 2.0m above the ground. The ball leaves his racquet with a speed of 22.0m/s at an angle 4.5 degrees above the horizontal. The horizontal distance to the net is 7.0 m, and the net is 1.0 high. i know that...

Homework Statement a boat is a drift in a stream that flows at 3 mph 40* north of east. A wind blowing at 11 mph from a direction 50*NW also moves the boat. What will be the net direction and speed of the boat? Homework Equations Vwa = 3mph 40* NE Vwi = 11mph 50* NW The Attempt at...

Homework Statement li have three charges, 2 with same charge (magnitude and sign) and 1 with a smaller charge(smaller magnitude and opposite sign to the other two). how would i position them on a line so that the net force on any of them is zero Homework Equations electric force, F =...

Homework Statement Blue charge is at origin with positive q charge Red charge at point (d1,0) with unknown positive charge q_red Yellow charge at point (d2cos(theta),-d2sin(theta)) with negative 2q charge The net electric force on the blue sphere has a magnitude F and is directed in the...

Homework Statement Particle 0 experiences a repulsion from particle 1 and an attraction toward particle 2. For certain values of d_1 and d_2, the repulsion and attraction should balance each other, resulting in no net force. For what ratio d_1/d_2 is there no net force on particle 0...

Homework Statement A proton is on the x-axis at x = 1.2 nm. An electron is on the y-axis at y = 1.2 nm. Find the net force the two exert on a helium nucleus (charge +2e) at the origin. Express your answer using two significant figures. Enter your answers numerically separated by a comma...

This is a fairly simple Question but I just can't figure it out. If there is an object and there are two forces that act on the 5 kg object (say this object is located on the origin of an sy plane) and F1= 25 N and points in the 0 degrees direction and the other force, F2= 15 N and points 60...

Homework Statement "A derrick boom is guyed by cables AC and AD. A worker is lifting a 20kg block by pulling on a rope that passes through the pulley at A. Knowing that the boom AB exerts a force A that is directed from B to A, determine this force and the force in each of the two cables."...

Homework Statement Two charges are placed on the x axis. One charge (q1 = +16.5 µC) is at x1 = +3.0 cm and the other (q2 = -19 µC) is at x2 = +9.0 cm. Find the net electric field (magnitude and direction) at the following locations. (a) x = 0 cm magnitude= ? N/C direction= ? (b)...

Homework Statement We are given that one infinite line of charge is placed horizontally on the x axis. The other line charge is placed parallel to the first at y = 0.4m. The first line has charge density 4.8 * 10^(-6) C/m, and the second -2.4 * 10^(-6) C/m. Find the net electric field at the...

Homework Statement Consider the following situation: http://img206.imageshack.us/img206/9739/fbdow8.th.jpg The height of the incline is 'h'. a) Find the net acceleration of the centre of mass of the combined system (of the incline and the block) relative to ground. b) Find the speed of...

Homework Statement In the figure below, the incline is frictionless and the string passes through the centre of mass of each block. The pulley has moment of inertia I and radius R. a) Find the net torque acting on the system (the two masses, string and pulley) about the centre of the pulley...

Homework Statement Two identical dipoles, each of charge q and separation a, are a distance x apart, as shown in Fig. By considering forces between pairs of charges in the different dipoles, calculate the net force between the dipoles. Show that, in the limit a<<x, the force has magnitude...

Homework Statement Two nonconducting spheres, of r1=3.0cm and r2=2.0cm, are placed of an x-axis. They have surface charge densities of +6.0mC/m2 and +4.0 mC/m2, respectively, on their outside surfaces. The center of sphere r1 is on the origin and the center of sphere r2 is 10 cm away. What is...

Im having a bit of trouble understanding this and hoping someone can give me an idea how to understand and calculate net displacement of 3 different directions and distances?

Two positive charges q0 at the origin and q1 at (0,d1,0) and one negative charge -q2 at (0,d2,0). What is the net force on particle 0 from particle 1 and 2? (See Picture CPartB inserted at bottom) F on 0 due to 1 = kq0q1/d1^2 and since it is in the negative y direction since q1 repels q0...

Hi all, I am having difficulty in understanding this basic phyics relating to force, work,and movement, and I am struggling to do these questions. I would appreciate any help. The following information was provided and then three questions followed. A boy drags a box by a rope across a level...

Homework Statement The balanced net ionic equation for precipitation of CaCO3 when aqueous solutions of Na2CO3 and CaCl2 are mixed is _____. Homework Equations Not sure of any The Attempt at a Solution I'm not sure how to get a "net ionic equation." I took chemistry 2 years ago and...

http://www.businessweek.com/technology/content/jul2008/tc20080711_699714.htm?chan=top+news_top+news+index_technology What are your opinions on net neutrality, and how it should be protected (or not protected)?

What happens when the NET force on a massless body is 0. I mean what will be the acceleration , if any? Also if we pull a massless spring, from one side with a force F1 and from the other side a force F2, what will be the spring force?

Homework Statement A mass of 500 g is attached to the bottom of an unstretched spring attached to the ceiling, and has a spring constant 10 N/m. The mass is then released. What is the net work done on the mass between the point where it was released and the lowest point that it reaches...

Homework Statement A 3.00 Kg object is moving in a plane, with its x and y coordinates given by x=5t^2-1 and y=3t^3+2, where x and y in meters and t in seconds. Find the magnitude of the net force acting on this object at t=2.00 secs. Homework Equations The Attempt at a Solution...