Net Definition and 1000 Threads

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 An ideal gas with gamma = 1.4 occupies 5.0 L at 300 K and 130 kPa pressure and is compressed adiabatically until its volume is 2.0 L. It's then cooled at constant pressure until it reaches 300 K, then allowed to expand isothermally back to state A. Find the net work done...

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...

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...