Net Definition and 1000 Threads

Homework Statement Three charges lie along the x -axis. The positive charge q1 = 10.0 microC is at x = 1.00 m, and the negative charge q2 = -2.00 microC is at the origin. Where must a positive charge q3 be placed on the x-axis so that the resultant force on it is zero? Answer: x = - 0.809 m...

Homework Statement A 325 N force acts on an object with a mass of 42.5 kg at an angle of 27° , pulling the object along a flat surface. The coefficient of friction is 0.21 and the object's displacement is 320m. Calculate the net work done on the object. Homework Equations W=Fdcos(θ) Fg=mg...

Homework Statement Hey I am having problems understanding how to get the net ionic and ionic formula. Any suggestions and/or tips on how to do them?

neutron star has a mass of 2.0 x 10^30 kg, and a radius of 5.0 x 10^3 m suppose an object falls from rest near the surface of such a star. how fast would it be moving after it had fallen a distance of 0.010 m? (gravity constant over star, and star is not rotating) and a person in a...

what is the net force acting on m1 in terms of T, g, and m1?

A 3.40 kilogram mass is moving in a plane, with its x and y coordinates given by x = 4.85t2 - 1.05 and y = 3.25t3 + 2.10, where x and y are in meters and t is in seconds. Calculate the magnitude of the net force acting on this mass at t = 2.10 seconds. I don't know if I am supposed to...

Homework Statement Given two particles with 2.00 microcoulombs charges and a particle with charge q= 1.28x10^-18C at the origin.(a) what is the net force exerted by the two 2.00 microcoulombs charges on the test charge q? (b) What is the electric field at the origin due to the two 2.00...

Homework Statement You're 1.5 m from a charge distribution whose size is much less than 1 m. You measure an electric field strength of 282 N/C. You move to a distance of 2.0 m, and the field strength becomes 119 N/C. Hint: Don't try to calculate the charge. Instead determine how the...

Homework Statement I have a test on this tomorrow .. please help.. A box, initially at rest, is pushed up a ramp by a constant force acting 20 degrees above the ramp’s surface (pushing into the ramp from behind the box). The magnitude of the force is 50.0 N. The coefficient of friction is...

Hello guys, I just need help understanding this question for my introductory physics class...my friend gave me the answer but I am not really sure i trust him or believe in his logic he used to figure it out...please help i attached the drawing so yall can see it! all it states is: what is...

Homework Statement What is the average net force on a car during a zero to 60mph (0 to 30m/s) acceleration? Compare this force to the weight of the car. Homework Equations I just don't know what equations to do and need help to figure out what to do.

I've been struggling with this for a while now. Cu(ClO4)2 is soluble so it should drop from both sides of the net ionic equation, right? Leaving only H20. Am I missing something? http://usera.imagecave.com/hotrod73dart/question/netionic.JPG

Homework Statement Mass of ball=0.500kg string length=1.02m I have a motion diagram of a ball being spun in a counter clockwise direction. there are four points on the circular diagram this is the best I can do right now ......v= 4.0m/s ......| ......| v=6.0m/s ---------- v= 6.0m/s...

Homework Statement http://carlodm.com/images/chem.png The Attempt at a Solution The attempt is in the image. HOW IS THIS WRONG?? I've looked at it for hours now!

Question is in orange, answer is in black. I got no idea how they got this answer :\ The way I am trying is using a substition of kx^2 = gsin\theta Just the one question i can't get my head aroung in this exercise step by step method would be appreciated

Homework Statement A conducting spherical shell has a total net charge of +2 micro Coulombs. A point charge of Q = -3 micro coulombs is placed at the center of the sphere. What is the total net charge on the inner surface of the sphere? Homework Equations coulombs law= kq1q2/r^2...

Homework Statement Two blocks with masses m1 = 1.10 kg and m2 = 3.20 kg are connected by a massless string. They are released from rest. The coefficient of kinetic friction between the upper block and the surface is 0.490. Assume that the pulley has a negligible mass and is frictionless, and...

I understand that to find moment of force, we look at direction of force and perpendicular distance. In the diagram, O is the centre and pivot of the circular disc. Would the anticlockwise moment at A be (30N x 4m)? I'm not sure if this is true, cos the distance 4m is only AB. It does not...

Homework Statement It's webbased, so I just took a screenshot: http://img27.yfrog.com/img27/2237/pyquestion.jpg Homework Equations F = ma The Attempt at a Solution Well, the way I figured it was that we could determine the force by calculating the average velocity between two...

Homework Statement http://img33.imageshack.us/img33/4547/walker4ech22pr054.jpg Two long, straight wires are oriented perpendicular to the page, as shown in the figure . The current in one wire is I-1 = 3.0 A, pointing into the page, and the current in the other wire is I-2 = 4.0 A, pointing...

[b]1. For women's volleyball the top of the net is 2.24m above the floor and the endline is 9.00m from the net. Using a jump serve, a player strikes the ball at a point 3.00 m above the floor and 8.00m (horizontally) from the net. If the initial velocity of the ball is horizontal and directed...

Homework Statement A ball with a weight of 1.0 N is thrown at an angle of 30 degrees above the horizontal with an initial speed of 12 m/s. There is no air resistance acting on the ball. At its highest point, the net force on the ball is: A. 4.9 N, 30 degrees below horizontal B. zero C. 4.9 N...

Homework Statement Find the net resistance in the circuit. each resistance is 3.3 kOhms. see attached Thanks! Homework Equations series r=r1+r2+r3... parallel 1/r=1/r1+1/r2...The Attempt at a Solution I tried taking into account the short circuit and just adding two. Also tried resistance of 2...

1. A solution of nickel nitrate is added to a solution of lithium sulfide. (you MUST write as a Net Ionic if appropriate). a. BALANCED EQUATION b. Which substance is being oxidized? 2. none really 3. I don't really have much of an attempt because it doesn't specify in the question...

What is the "net" magnetic moment per atom of a typical ferromagnet crystal ? I suspect the number will be different from those of "isolated" atoms because of band formation and spilling... But I am not very sure, this could be wrong. Is it 1 Bohr magneton per atom, 10 , 50 more ? Do...

Net torque and net force in equilibrium.. Help please Homework Statement The diagram shows a uniform plank of length 5.0m and weight 225N that rests horizontally on 2 supports, with 1,1 m of the plank hanging over the right support...

Which of the following describes an object with zero net force acting on it? Choose all that apply. A car sped along at a constant rate while making a left turn. A truck sped up while proceeding along a straight path. A plane slowed down while making a u-turn. A boat accelerated at a...

particle 1 of charge q1 = +1.2 µC and particle 2 of charge q2 = -2.5 µC, are held at separation L = 14 cm on an x axis. If particle 3 of unknown charge q3 is to be located such that the net electrostatic force on it from particles 1 and 2 is zero, what must be the (a) x and (b) y coordinates of...

Homework Statement The figure below shows two concentric rings, of radii R and R ' = 3.00R, that lie on the same plane. Point P lies on the central z axis, at distance D = 2.00R from the center of the rings. The smaller ring has uniformly distributed charge +Q. What must be the uniformly...

Homework Statement Four charges Aq,Bq,Cq, and Dq (q = 1.00 × 10-7C) sit in a plane at the corners of a square whose sides have length d = 85.0 cm, as shown in the diagram below. A charge, Eq, is placed at the origin at the center of the square. DATA: A = 6, B = 2, C = 3, D = 6, E = -1...

Homework Statement A nonconduction spherical shell, with an inner radius of 4.0 cm and an outer radius of 6.0 cm, has charge spread nonuniformly through its volume between its inner and outer surfaces. The volume charge density p is the charge per unit volume, with the unit coulumb per cubic...

Homework Statement im given an experiment on reactivity series and required to write net ionic equation in the results.. I am kinda stuck in this reaction.. between this 3 metal.. iron, copper, and zinc.. reacting with nitric acid.. Homework Equations the reaction was carried out with...

A model rocket with a mass of 0.50 kg is fired vertically from the ground. Assume that it is streamlined enough that air resistance can be ignored. Suppose it ascends under the influence of a constant net force of 2.0 N acting in a vertical direction and travels for 6.0 s before its fuel is...

I have no idea how to write these two reactions as net ionic equations in order to show relevancy to their respective pH: Na2CO3 + HCl (pH of 10.36) I know that it dissociates into OH- ions since it has a very basic pH and NaHSO4 + HCl (pH of 4.18) I also know that this...

1)When a 58 g tennis ball is served, it accelerates from rest to a speed of 45 m/s. The impact with the racket gives the ball a constant acceleration over a distance of 44 cm. What is the magnitude of the net force acting on the ball? 2)A skater with an initial speed of 7.60 m/s is gliding...

Homework Statement A top fuel dragster accelerates at six times the acceleration of gravity. Its mass is 3000kg and it has an initial frictional force of 6000N M = 3000kg A = 60ms-2 (Lets just say gravity = 10ms-2 down) Homework Equations a) What is the total force? b) What is the...

Is F# fortran for .NET? My roommate seems to be under the impression that it is something like that. But I can't find any clear info on it's relation to Fortran.

1) A student driving her 1.60 x 102 kg car at 50.0 km/h presses on the gas pedal and accelerates to 90.0 km/h in 12.0 s. What is the average net force applied by the car’s engine during this time interval? 2) v=vf-vi, f=ma, a=v/t 3) i found v by subtracting 90.0km/h by 50.0km/h...

1. Two soccer players kick a ball at the same time. One player exerts a force of 58 N west and the other student exerts a force of 75 N south. What is the net force on the ball? 2. V= Vf-Vi, trig formulas 3. i drew this question out and it made a right triangle, so i solved for the...

Homework Statement three planets, X,Y and Z, are situated in 3 different places. distance between X and Y = 60 x 106 km distance between Y and Z = 50 x 106 km mass of X = 3.0 x 1024 kg mass of Y = 4.0 x 1024 kg mass of Z = 5.0 x 1024 kg find the net gravitational force on...

Explanation of "net torque" in a problem I hate to ask such a simple question, but I was working on a problem where the idea of "net torque" was calculated differently than I thought. I more or less and just looking for the flaw in my logic and an explanation. :smile: Here's the main...

There are four charges, each with a magnitude of 1.98 μC. Two are positive and two are negative. The charges are fixed to the corners of a 0.288-m square, one to a corner, in such a way that the net force on any charge is directed toward the center of the square. Calculate the magnitude of the...

Hello, I'm self studying physics right now and have learned about Newton's laws. However, I am confused by the first law. I understand that when the net force is 0, an object will continue its original motion at the same velocity. But how does this work for an airplane which is moving at a...

1 The net force on any object in equilibrium is zero. 10 meters per second squared. equal to its weight. None of these. End of Question 1 Question 2 2 The tension in a rope that supports a 2-lb. bag of sugar hanging at rest is 9 N. 2 lbs. Either of...

Write the molecular eqaution and the net ionic equation for each of the following aqueous reactions. If no reaction occurs, write NR after the arrow. A) Na2Co3 + MgBr2---> B)MgSO4 + NaOH----> I can't figure these two out. From the solubility rules, all the compounds are soluble so there...

Homework Statement Part A: A 5.73 kg mass is attached to a light cord, which is wound around a pulley. The pulley is a uniform solid cylinder of radius 9.14 cm and mass 1.26 kg. The acceleration of gravity is 9.8 m/s2 . What is the resultant net torque on the system about the center of the...

Scientists are experimenting with a kind of gun that may eventually be used to fire payloads directly into orbit. In one test, this gun accelerates a 5.0 kg projectile from rest to a speed of 4.29 km s-1. The net force accelerating the projectile is 0.47 MN. How much time is required for the...

Homework Statement "An athlete at the gym holds a 5.86 kg steel ball in his hand. His arm is 66.2 cm long and has a mass of 5.56 kg. What is the magnitude of the torque about his shoulder if he holds his arm straight out to his side, parallel to the floor?" Homework Equations torque =...

Homework Statement "Three blocks (m1, m2 and m3) are in contact with each other on a frictionless, horizontal surface. A horizontal force is applied to m1. http://i4.photobucket.com/albums/y111/kathy_felldown/sb-pic0556.png What is the net force on block 1 and block 2? What is the...

Homework Statement Two point charges of unknown magnitude and sign are places at some distance apart. The electric field is zero at a point not between them , but on the line joining the. Write 2 essential conditions for this to happen.Homework Equations E = q1*q2/(4 * pi * epsilon0 * r2) The...