Net Definition and 1000 Threads

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...

May 21, 2009 OK math Guru's, I'm going to give you the question and the answer, what I need from you is the easiest way to GET TO the answer. A chef is attending a big weekend food fair. He is famous for his egg dishes. He knows that he will need 496 eggs for all of the...

Homework Statement This is the problem: http://session.masteringphysics.com/prob ... A squar emetal plate .180 m on each side is pivoted about an axis through point O at its center and perpendicular to the plate. Calculate the net torque about this axis due to the three forces shown in the...

Homework Statement A 250 N force is applied at an angle of 32° above the horizontal to a 96 kg wooden box causing it to slide along a floor as shown. The coefficient of friction between the floor and the box is 0.18. What is the magnitude of the net force on the wooden box? The Attempt at a...

each capacitor has capictance c find net capictance b/w a and b http://img17.imageshack.us/img17/5720/13481036.gif

Homework Statement The figure shows a 3.00 meter by 7.00 meter rectangular loop of wire with resistivity 3.90x10-6 Ohm-m and a resistance of 25.0 Ohms. Initially, the magnetic field is zero everywhere. However, after t = 0, B increases at 1.00 T/s out of the page everywhere above the dotted...

The Earth has a surface temperature around 270 K and an emissivity of 0.8, while space has a temperature of around 2 K. Use Stefan's law: P(net) = 5.67×10-8 W/K4 m2 *A*e*(T4 - To4) to solve the following questions. (Radii of the Earth and the Sun are Re = 6.38×106 m, Rs = 7×108 m.) (a)...

Homework Statement A cylinder having a mass of 2.0kg can rotate about its central axis through point O. Forces are applied as show: F1 = 6.0N, F2 = 4.0N, F3 = 2.0 N, and F4 = 5.0N. Also, r = 5.0cm and R = 12 cm. Find the (a) magnitude and (b) direction of the angular acceleration of the...

Homework Statement A uniformly charged conducting sphere of 1.6 m diameter has a surface charge density of 8.0 µC/m2. What is the net charge of the sphere, and what is the total electric flux leaving the surface of the sphere? Homework Equations surface charge density = q/A flux = E x...

Homework Statement At each point on the surface of the cube shown in the figure, the electric field is parallel to the z axis. The length of each edge of the cube is 3.7 m. On the top face of the cube = -40 N/C, and on the bottom face of the cube = +10 N/C. Determine the net charge...

Homework Statement Three positive point charges are arranged in a triangular pattern in a plane, as shown below. The Coulomb constant is 8.98755 × 109 N · m2/C2. Find the magnitude of the net electric force on the 2 nC charge. Answer in units of N. Homework Equations Fe = (kq1q2) / (d2)...

Homework Statement A particle with charge −9 μC is located on the x-axis at the point 8 cm, and a second particle with charge 5 μC is placed on the x-axis at 6 cm. The Coulomb constant is 8.9875 × 109 N · m2/C2. What is the magnitude of the total electrostatic force on a third particle with...

I have a question. For example there are three forces of diff magnitudes and are in three diff directions (not oppo directions) acting on a body. if the lines of action of the 3 forces pass through a common point, why the net torque abt that pt is zero? Can someone help me pls? Thanks!

Homework Statement 1. Compare the mass of the system to the slope. Does your data support Newton's Second Law? 2. Using the words "directly" or "indirectly" briefly explain how force, mass, and acceleration are related to each other, making specific references to the parts of the...

Homework Statement I need to find net ionic equations for: -Fe(NO3)3 + NH3 -Cr(NO3)3 + NH3 -Cu(NO3)2 + NH3 -AgNO3 + NH3 -Cr(OH)3 + NaOH -Fe(OH)3 +NaOH and a whole bunch of other reactions. I have no problem with writing the balanced equations but I get a little stuck on breaking things...

Homework Statement Two point charges, q1 and q2, are placed 0.30m apart on the x-axis, as shown in the figure(http://hiviz.org/apb89/ap/problems/2006-3.jpg" . Charge q1 has a value of -3.0x10^-9 C. The net electric field at point P is zero. A) What is charge of q2 (Positive/Negative) B)...

Homework Statement A +2.0-nC charge is at the origin and a -4.0-nC charge is at x = 1.0-cm. At what x-coordinate could you place a proton so that is would experience no net force? [NOTE by me] I put q1 as the positive charge (+2.0nC) and q2 as the negative charge (-4.0nC). q0, of course...

Homework Statement Homework Equations F=ma The Attempt at a Solution According to Newton's 3rd law, the box pushes back on the person 36N. But I don't know how you find how much force the smaller crate exerts on the larger one.

Homework Statement Three 8kg spheres are located at (0, 1.7), (1.7, 1.7), and (1.7, 0) named A, B, and C respectively. What is the net gravitational force acting on sphere A? Homework Equations F = GMm/r2 The Attempt at a Solution So far I've tried this several ways with no...

Homework Statement A long, straight wire carries a current of I1 = 15.8 A. Next to the wire is a square loop with sides L = 1.17 m in length. d = 1.42 m, as shown in the figure below. The loop carries a current of I2 = 2.66 A in a direction parallel to the wire. Calculate the magnitude of...

1.A small 3.94 g plastic ball is suspended by a 27.9 cm long string in a uniform electric field of 3400 N/C. The acceleration of gravity is 9.8 m/s2 , and the Coulomb constant is 8.99×109 N · m2/C2. If the ball is in equilibrium when the string makes a 43.2◦ angle with the vertical as in-...

Homework Statement The drawing shows three point charges fixed in place. The charge at the coordinate origin has a value of q1 = +8.02 C; the other two have identical magnitudes, but opposite signs: q2 = -4.73 C and q3 = +4.73 C. (a) Determine the net force exerted on q1 by the other two...