Net Definition and 1000 Threads

Homework Statement Q: A boy falls with the acceleration 4g in a free fall until he hits a net. His mass is 78kg. You can ignore other forces. With what force does he influence the net? Homework Equations F=m*a The Attempt at a Solution I use the formula F=m*a which gives med...

Homework Statement I was watching a Khan Academy video (here) on electric potential energy (not Voltage.) Here was the problem: There is an infinitely extending positively charged plane (uniform.) The charged plane has a positive electric field with 5 N/C (Newtons per Coulomb.) Electric...

Homework Statement Find magnitude of net upward force on a cube in terms of l, ρ (rho), g and h. then show that h = m/ρl2 A solid cube, mass m, side length l, is placed in a liquid of uniform density, ρ(rho), at a depth h0 below the surface of the liquid, which is open to the air. The upper...

Homework Statement The gravitational field strength between two objects is the sum of two vectors pointing in opposite directions. Somewhere between the objects, the vectors will cancel, and the total force will be zero. Determine the location of zero force as a fraction of the distance r...

Here is the second question. Question 2: Ace Formal wear buys tuxedos from a supplier and has an invoice amount of \$27,700. The terms of the sale are 3/20, n/30. If Ace sends a partial payment of \$7,400 on the discount date, what is the net amount still due?

Homework Statement You are passing a construction site on the way to physics class, and stop to watch for a while. The construction workers appear to be going on a coffee break, and have left a large concrete block resting at the top of a wooden ramp connecting one of the building's upper...

I need to make a net for a frustum. The following web page explains how to do it... http://www.analyzemath.com/Geometry/conical_frustum.html I have tried but am unable to do this complicated, advanced (o.k basic) math. In the following figure I have the values R,r and h. R = 40 r = 35 h =...

Hi I have tried to search through various books including perrys Can anyone state the net calorific value (lower heating value) for butene C4H8 and the source if possible It would be much appreciated Thanks

Homework Statement A student holds a book at rest on the palm of her hand. She lifts the book straight up, bringing it to rest again at a higher point. 1. Is the net work done on the book positive, negative, or zero? 2. Is the change in the gravitational potential energy positive, negative...

As we know \ a= \frac {F} {m} So does this equation prove that acceleration is directly proportional to the net force and inversely proportional to the mass of the object?

Homework Statement A 65 kg airplane pilot pulls out of a dive by following at constant speed, the arc of a circle whose radius is 300 m. At the bottom of the circle her speed is 180 km/h. a.) Calculate net force on pilot at bottom or circle. b.) Calculate force exerted on pilot by seat at top...

Homework Statement Consider a system of a ball and the Earth. The ball is held at rest at an initial height, then dropped. Derive an expression for the net external work by external forces on BE. Homework Equations W = Fx W = deltaK V = mgh K = (1/2)mv^2 The Attempt at a Solution My confusion...

Homework Statement Suppose that a person is pulling a car with an acceleration of 6 m/s^2. If the reindeer triples the net force, what is the new acceleration? Homework Equations F=ma where, m= mass, a= acceleration, F=force The Attempt at a Solution I really do not know what my teacher...

Homework Statement A uniform electric field exists everywhere in the x, y plane. This electric field has a magnitude of 3600 N/C and is directed in the positive x direction. A point charge -9.8 × 10-9 C is placed at the origin. Find the magnitude of the net electric field at y = +0.20...

Homework Statement We are given a circuit with a inductor that has a magnetic core and a magnet that is moving away from the inductor and to the inductor. We can control the flow of current through the inductor using 4 switches. We have to find the net average power at the output of the battery...

Homework Statement [/B] A charge of +2q (a) is placed at the origin and a second charge of -q (b) is placed at x = 3.0 cm. Where can a third charge +Q (c) be placed so that it experiences a zero net force?Homework Equations F = k(Q1)(Q2)/r^2 E = kQ/r^2 Quadratic?The Attempt at a Solution [/B]...

Hi, really I just want to know if I have drawn this out correctly. I have an object with a velocity going North of West. It is going against a current South. As you can see from the chart I have mapped out the degree the object is heading North of West. How would I find net velocity from this...

Homework Statement The two wires shown in the figure carry currents of I = 5.58 A in opposite directions and are separated by a distance of d0 = 8.43 cm. Calculate the net magnetic field at a point midway between the wires. Use the direction out of the page as the positive direction and into...

The notion of multiplying the current in each loop in a toroid or solenoid with the total number of loops in order to find out the net current in the toroid or solenoid is appearing a bit confusing. Why do we do this when we know the same current is flowing through each loop (just like water...

Hello comrades, Question A negative charge of 3.00 mC is 1.20m to the right of another negative charge of 2.00 mC. Calculate the point along the same line between the two charges where the net electric field will be zero. Formulas E=kq/r2 Attempt at Solving Well, I get as far as setting...

Homework Statement Problem #7[/B](Due 9/26 Friday by 8:00 a.m.) Hydro, who has a mass of 45.1 kg, falls straight down 4.67 m to the water below. a. If Hydro comes to rest .543 seconds after hitting the water, what was the net force exerted on Hydro over this time? Homework Equations The...

Homework Statement a 4 kva, 230/115 volt, 400 HZ, single phase transformer originally designed for use in air crafts, is available in a laboratory for obtaining 115 volt supply from standard 230 volt,50 HZ mains if overloading of the device is not permitted then net kva output is...Homework...

The problem statement The solutions of ##NaC_2H_3O_3 + BaCl_2 +NH_4NO_3 + K_2CrO_4## are mixed together. 1. Write the Net Ionic Equation. 2. What is the driving force of the reaction? The attempt I'm not sure how to solve for the net ionic equation without a balanced equation. My...

I am trying to understand why is the surface of the Earth negative. From the internet search, I found -105 C. I make a sequence according to the conventional model and question at each step. 1. The surface is slightly negative: here I just accept and start. 2. Atmosphere is positive: Some...

Homework Statement I'm have a hard time figuring out how to do this problem: A sailboat tacking against the wind moves as follows: 3.8 km at 45° east of north, 4.5 km at 55° west of north, 2 km at 45° east of north. What is the net displacement for the entire motion? How many degrees east of...

I do not really understand the big picture of gauss law. For what I know a conductor is a material where electrons can move freely, but I am reading my book and they show pictures where the protons are all right below the surface. My other question would be how can you describe the inside of a...

Homework Statement A spring is compressed from both ends by 100 Newtons and the spring constant is given as 1000N/m. What is the net compression distance/displacement (x)? Homework Equations F=-k*change(x) The Attempt at a Solution Initially, I thought that the net displacement would...

I am unable to proceed. Please help me by describing how to solve it(and the method and reason behind the approach) Thank you

Homework Statement . If ##(x_{\alpha})_{\alpha \in \Lambda}## is a net, we say that ##x \in X## is an accumulation point of the net if and only if for evey ##A \in \mathcal F_x##, the set ##\{\alpha \in \Lambda : x_{\alpha} \in A\}## is cofinal in ##Lambda##. Prove that ##x## is an accumulation...

Homework Statement If P=0, replace the two remaining couples with a single equivalent couple, specifying its magnitude and the direction of its axis. The Attempt at a Solution Position vector of B(rb)=0.3i Similarly, rd=0.16j+0.17k ∠GCF=atan(16/30)=28.07° ∠DEF=atan(DF/FE)=45°...

Homework Statement Peter, a 100 kg basketball player, lands on his feet after completing a slam dunk and then immediately jumps up again to celebrate his basket. When his feet first touch the floor after the dunk, his velocity is 5 m/s downward; when his feet leave the floor 0.50 s later, as...

When I was in introductory physics I remember being told that the net force (gravitational for example) inside a shell is always 0. I always felt that, intuitively, this would only be true at the center of the ring. Not sure what made me think of it today, by I decided to sit down and do the...

I am not sure if I should start a new thread or revive an old thread this because it is the same topic. Location of tests: Scandinavia I simply want to know why and how a current carrying conductor parallel to Earth surface moves perpendicularly to the current flow and parallel...

Homework Statement Two 59.9N forces are applied in opposite directions to the 28.3cm long figure shown. If the angle θ = 29.6°, what is the net torque about the center of mass...

Homework Statement Three charged particles are placed at the corners of an equilateral triangle of side 1.20 m (see figure). The charges are Q1 = +3.5 µC, Q2 = -7.2 µC, and Q3 = -5.1 µC. Calculate the magnitude and direction of the net force on each due to the other two. (Assume the +x axis...

Homework Statement Two objects carry initial charges that are q1 and q1 respectively, where |q2| > |q1|. they are located 0.200m apart and behave like point charges. they attract each other with a force that has a magnitude 1.2N. the objects are then brought into contact, so the net charge is...

Homework Statement There are only 3 forces acting on an object. The forces are 20.0 dynes E15°, 30.0 dynes W15°, and 40.0 dynes S15°W [b]2. Relevant equation I've tried using the parallelogram method The Attempt at a Solution When i did the parallelogram method i got...

I'm very surprised that nobody has posted on the topic. The FCC is planing to kill net neutrality in everything but name; as a result, the internet could change in very fundamental ways. https://www.eff.org/issues/net-neutrality It is already affecting investments in startups...

If you haven't seen this yet, check it out. John Oliver gives us the low down on Net Neutrality "Colbert" style. It's great! and depressing. https://www.youtube.com/watch?v=fpbOEoRrHyU

Homework Statement Homework Equations I am wondering if the answers given in the teacher's guide are incorrect. Ans given for #2: [All same], [A,C,B,D] Ans given for #3: [A,C,D,B] The Attempt at a Solution My answers: #2a: Net forces: A,B,C are 5N; D is 10N. Therefore the...

Homework Statement I have attatched a snapshot explaining the question Homework Equations ## \vec{F} = \frac{kq_{1}q_{2}}{r^2}\hat{r} ## The Attempt at a Solution First I will calculate the force on the left charge due to the other two ## \vec{F}_{net} =...

Homework Statement A high-jumper with a mass of 65kg just clears a height of 2.13m and drops onto a 0.30m thick landing mat. a) What average net force does the landing mat exert on the high jumper if it is compressed by 0.18m during landing? b) What would be the effect on the force if the...

1.)Two charges are fixed in location: charge q1= +8e is located at the origin and charge q2= -2e is located on the x-axis at x=L. At what point can a proton be placed so that it has net zero force acting on it? 2.)F=kq1q2/r^2 3.)I tried to do F=0 K = 8.988 X 10^9 (constant) q1 = (8...

A man is pushing a box from behind with a constant net force F=146 N parallel to the ground on the level floor, moving it to a distance of 54 m. The coefficient of the kinetic friction between the box and the floor is 0.060. Mass of the box is 92 kg. Initially the box was at rest. a)...

Homework Statement -I've attached a picture of the problem- An infinitely long straight wire of steady current I1 is placed to the left of a circular wire of current I2 and radius a as shown. The center of the circular wire is distance d(≥ a) away from the straight wire. Let’s find the net...

So this thread has been closed and I can't comment on it. I am working on this question as well and am stuck on b). I managed to solve for a) and c) but I have no idea how to go about finding the force normal and do not know where the formula "Fnet= mg + ma" came from or why to use it. Could...

Really don't like this book, he's crazy ambiguous, I've looked it up myself on the internet and it makes far more sense, but it's our textbook so I have to understand what he's trying to say. We're coupling the angular momentum of an electron's orbital and spin based angular momentum. And he...

Homework Statement Given two particles with Q = 2.30 µC charges as shown in the figure below and a particle with charge q = 1.38X10-18 C at the origin, answer the following. (Note: Assume a reference level of potential V = 0 at r = ∞.) (a) What is the net force exerted by the two 2.30...

Homework Statement You are riding in a car that crashes into a solid wall. The car comes to a complete stop without bouncing back. The car has a mass of 1500 kg and has a speed of 30 m/s before the crash. (this is about 65 mi/hr). What is the net impulse that acts on the car to bring it to...

Homework Statement Calculate the net force acting on each object indicated in the diagrams. Show your work. Homework Equations a2 = b2 + c2 tanO = opposite/adjacent C2 = a2 + b2 – 2abCosC sina/A=sinb/B=sinc/C The Attempt at a Solution I attached the diagram below, it...