Net Definition and 1000 Threads

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

hi i have a lab due and i can't figure this out. we have to find the mass of a paper clip using the net torque equations. we have 3 clamps attached to the fulcrum stand so we have to incorporate the force of gravity on them too. to make the stand level the paper clip attached to a clamp is at 50...

I prepared a drawing to reference what i am trying to explain: http://i20.photobucket.com/albums/b225/rush02112/part1.jpg I will have pressure acting against the all surfaces of this part. Notice this part will only be able to move parallel to the center line of the part. I want to know...

Homework Statement A Long-Jump Contestant experiences at the instant of landing, a gravitational force of 538N [Downwards], and a force applied by the ground to the feet, of 6382N [28.3 degrees above the horizontal] (The answer is given in the book, being 6.15 X 10^3 N [23.9 Degrees above...

Homework Statement 10C of charge are placed on a spherical conducting shell. A -3C point charge is placed at the center of the cavity. The net charge in coulombs on the inner surface of the shell is... A. -7 B. -3 C. 0 D. +3 E. +7 Homework Equations \oint \vec{E}\cdot d\vec{a}...

Homework Statement An object is moving to the right in a straight line. The net force acting on the object is also directed to the right, but the magnitude of the force is decreasing with time. The object will a) stop and then begin moving to the left. b) continue to move to the right...

[b]1. The problem statement, A driver wearing a seatbelt decelerates at roughly the same rate as the car itself. Since modern cars have a "crumple zone" built into the front of the car, the car will decelerate over a distance of roughly 1.0 . Find the net force acting on a 70-kg driver who is...

http://manuscripts.cmrs.ucla.edu/ 1000s of original texts digitised and readable on the net.

Homework Statement A 2kg mass starts from rest and slides down an inclined plane 8.0X10m long in 0.50s. What net force is acting on the mass along the incline? Homework Equations The Attempt at a Solution I don't even know where to begin.

Homework Statement The 19.6 cm diameter disk rotates on an axle through its center. F1=22.8 N, F2=32.5 N, F3=32.5 N, F4=22.8 N, and d=4.60 cm. What is the net torque about the axle? Homework Equations Torque = F r sin (angle) F = m g The Attempt at a Solution I found all the...

An airboat with mass 4.38 102 kg, including passengers, has an engine that produces a net horizontal force of 8.08 102 N, after accounting for forces of resistance. a>how long does it take the airboat to reach a speed of 16.0 m/s? b>After reaching this speed, the pilot turns off the engine and...

Homework Statement This is the question. Charges q1= -6Q and q2 = +2Q are located at x =-a and x = +a, respectively. Homework Equations Part A What is the net electric flux through a sphere of radius 2a centered at the origin? Part B What is the net electric flux through a sphere of...

I was given some notes on aircraft performance that states the equation for finding the net thrust of a jet engine. ---------------------------------------------------- It states (words in brackets are subscripts): F(N) = m dot (air) + m dot (j) V(j) - m dot (air) V F(N) = net thrust...

Homework Statement The coefficient of static friction between a block and a horizontal floor is 0.40, while the coefficient of kinetic friction is 0.15. The mass of the block is 5.0 kg. A horizontal force is applied to the block and slowly increased. What is the value of the applied...

Greetings everyone! Thanks in advance for the help! Homework Statement Two parts to the problem. For both parts it asks for the magnitude of the net force and the direction of angle from the X axis. Part A: Two forces, F1 and F2, act on an object at rest at a 90* angle. F1 = 30N, F2 = 11N...

A positive charge of +q1 is located 5.22 m to the left of a negative charge -q2. The charges have different magnitudes. On the line through the charges, the net electric field is zero at a spot 2.55 m to the right of the negative charge. On this line there are also two spots where the potential...

Homework Statement A person walks on level ground 0.6 km east, then 500 meters south, and then climbs to the top of a building (height 180 meters). What is the net displacement of the person? Homework Equations The Attempt at a Solution Really have no idea. I know that 600m...

[b]1. Here is the question we were given: There are two charges on a horizontal line of 2 m length. *-----------------------* Qa = +4q Qb = +2q If a third point of charge "q" is moved between these points, where will the forces acting...

The coefficient of static friction between a block and a horizontal floor is 0.37, while the coefficient of kinetic friction is 0.14. The mass of the block is 3.4 kg. If a horizontal force is slowly increased until it is barely enough to make the block start moving, what is the net force on the...

Homework Statement The water molecule forms an angle, with hydrogen atoms at the tips and the oxygen atom at the vertex (see diagram in the previous problem). Assume that the angle at the oxygen atom is Θ = 103.5o and the distance between the oxygen and the hydrogen atoms is d = 93.1 x 10-9...

Homework Statement Two charges, -16 and +3.4 mC, are fixed in place and separated by 4.4 m. (a) At what spot along a line through the charges is the net electric field zero? Give the distance of the spot to the positive charge in meters (m). (Hint: The spot does not necessarily lie between...

Homework Statement The coefficient of static friction between a block and a horizontal floor is 0.414, while the coefficient of kinetic friction is 0.138. The mass of the block is 5.24 kg. A horizontal force is applied to the block and slowly increased. What is the value of the applied...

Homework Statement Two equal charges +6 μC are placed, one at <−1, 0, 0>m and the other at <5, 0, 0> m. What is the net electric field vector at the location A which is at <0, 0, 0>m? Show your work. Homework Equations E=KQ/|r|^2 * |r| The Attempt at a Solution...

Homework Statement Nine different charged balls, which we treat as point charges, are arranged in a highly symmetric pattern around a square. Note that the value of Q is 4.00 x 10-6C, and L = 30.0 cm Image: http://www.webassign.net/userimages/81224?db=v4net Homework Equations 1)...

Homework Statement Two point charges, Q1 = -6.9 µC and Q2 = 1.1 µC are located between two oppositely charged parallel plates, as shown in Fig. 16-65. The two charges are separated by a distance of x = 0.38 m. Assume that the electric field produced by the charged plates is uniform and equal...

Homework Statement Two point charges, Q1 = -6.9 µC and Q2 = 1.1 µC are located between two oppositely charged parallel plates, as shown in Fig. 16-65. The two charges are separated by a distance of x = 0.38 m. Assume that the electric field produced by the charged plates is uniform and equal...

Homework Statement Evaluate the net force on a 200 -m high dam with a 60 mwater depth. Homework Equations P=F/A p(hydrostatic pressure)=rhogh+patm The Attempt at a Solution The atmospheric pressure acts on both the dam and the water, so it cancels out of the equation. g=9.8m/s^2...

Homework Statement Two charges, -29.7\muC and +5.5\muC, are fixed in place and separated by 4m (a) At what spot along the line through the charges is the net electric field zero? Locate this spot relative to the position of the positive charge (b) What would the magnitude of the force on a...

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