Average Definition and 1000 Threads

Suppose a body moving in a curved path at a constant speed would its average velocity for a specific time period equal its final instantaneous velocity at the end of this period ?

Homework Statement "By means of a balanced chemical equation, including state symbols, illustrate the term average C-H bond energy in methane." Ans: CH4 (g) -> C(g) + 4H(g) Average bond energy = +x/4 kj/mol Why C (g) ? Why is the state of C gas?

New to physics, so I'm looking for guidance and help. Here is the following question: A=19 B=0 On a road trip, a driver achieved an average speed of (48.0+A) km/h for the first 54.0 km and an average speed of (43.0-B) km/h for the remaining 86.0 km. What was her average speed (in km/h) for...

http://www.sciencedirect.com/science/article/pii/S0273117715005712 from the abstract: Obviously, the most prominent missing 'forcing' parameter here, is "concentration of greenhouse gasses". There is probably some food for thoughts here, especially when the analysis of Den Volokin and Lark...

So this is my first question here, and I hope I'm doing it right! My question is basically this: Find the average rate of change of the function from x1 to x2. f(x) = x^2 + 12x -4 I'm also new to precalc, so please don't blame me if this is a really easy question! It doesn't seem to make...

Hello, I'm trying to use a moving average to optimize performance. However, I don't want to just choose an arbitrary period to begin with. Do you have any suggestions as to how to determine the proper period to begin with. What I'm asking is: Is there a mathematical formula to determine the...

A ball travels vertically downwards until it hits a concrete floor with speed 16.1-m/s. It then bounces vertically upwards at 3.4-m/s. Examination of a high speed video shows that the collision took 1.1-ms. Considering just the collision, what is the magnitude of the average acceleration? b)...

Homework Statement A car travels along a straight stretch of road. It proceeds for 11 mi at 52 mi/h, then 25.4 mi at 43 mi/h, and finally 48.5 mi at 38 mi/h. What is the car’s average velocity during the entire trip? Answer in units of mi/h. Homework EquationsThe Attempt at a Solution...

Any one knows how to calculate the magnetic B field strength at a distance from a Large Conductor ? Do we go by average ? thanks

Homework Statement A windmill is used to raise water from a well. The depth of the well is 5.0 m. The windmill raises 204 kg of water every day. What is the average useful power extracted from the wind? A. 12 mW B. 120 mW C. 690 mW D. 1700 mW Homework Equations P = W/t The Attempt at a...

Homework Statement You drive on Interstate 10 from San Antonio to Houston, half the time at 58 km/h and the other half at 103 km/h. On the way back you travel half the distance at 58 km/h and the other half at 103 km/h. What is your average speed (a) from San Antonio to Houston, (b) from...

I am interested in polyhedrons (mostly hexahedrons and pentahedrons). The shapes I am interested in are irregular, where none of the opposing faces are parallel to each other. However, the shapes I am dealing with all CONVEX. I have the vertices of my polyhedrons and was wondering if I sum up...

Hello, Suppose given a sample data of particle traveling with following co-ordinates: x | y [(2, 2), (4, 2), (4, 3), (4, 4), (1, 3), (1, 1), (4, 4), (4, 1), (0, 4), (4, 2)] we want to calculate the Average velocity. How do we find it? If we use difference between initial and last won't give...

1. a man drives from a to b with car and speed of 20 km/h and returns from b to a immediately with speed of 30 km/h. what's the average speed and average velocity? 2. V=at+Vi etc 3. I think avg. speed will be 25 km/h and avg. velocity is -10 km/h. Is that right? thanks :)

Stanford's Physics profile on GradSchoolShopper.com lists their incoming class's GRE scores as: "The average GRE scores for admitted students in 2014–15 were: Verbal-171, Quantitative–176; Analytical–4.42; Physics Subject–928." How do we interpret these general GRE scores? Everywhere I look...

The question is: Expand a function $ {\phi}(x, y, z) $ by Taylor’s expansion. Evaluate $ \overline{\phi} $ the average value of $ {\phi} $, averaged over a small cube of side $ l $ centered on the origin and show that the Laplacian of  is a measure of deviation of  $ {\phi} $ from (0, 0...

Hey, When performing Molecular dynamic or Monte Carlo simulation (in NPT or NVT ensemble), I'm wondering whether there is any difference between the average energy of the system and the energy of the average structure. If there is a difference, how munch should it be? and why? Does the the...

Hello everyone. Let us consider two fermions whose spin state wave functions are certain (normalized) ##\psi_{1}## and ##\psi_{2}##. So the overall normalized spin state wave function of this system is of the form: ##\psi = (1/\sqrt{2})(\psi_{1} \psi_{2} - \psi_{2} \psi_{1})## Is there any...

I'm interested in the following inequality (which may or may not be true) Theorem 1: ##( \sum_{i=1}^n \frac{a_i} {n}\ )( \sum_{i=1}^n \frac{1} {b_i}\ ) > \sum_{i=1}^n \frac{a_i} {b_i}\ ## Where ##n ≥ 2, a_1 < a_2 < ... < a_n## and ##b_1 < b_2 < ... < b_n##. My attempt at a proof: 1) When n =...

Homework Statement On a straight road you start your car and increase the speed at a steady rate to 45 miles per hour during a 5 second interval. Calculate: a)the average speed during the 5 seconds b) the acceleration in miles per second at t = 3.2 sec. after you start your car c) the speed of...

Homework Statement Find the shear stress alone the cylindrical area of the plate, and the average shear stress in the bolt head along the cylindrical area. the plate is 30 mm thick bolt head is 8 mm thick bolt head diameter is 18mm bolt shank diameter is 7 mm shank has 8 kn along it...

Homework Statement Rocket engine expends 1150 kg of gas in 1 second, with a velocity of -4.50×10^4 m/s. Calculate the average force exerted on the rocket by the gas during that 1.0 second interval Homework Equations F= m(delat)v / (delta)t The Attempt at a Solution F= (1150kg)(-45000m/s) / 1...

Homework Statement A 500hp Mustang is able to push this 1750kg car down a 410m drag strip in a time of 11.5s. a) What is the work done by the car? b) What is the average force during the car's motion. Given: Power = 500hp = 372000w Mass = 1750kg Distance = 410m...

< Mentor Note -- thread moved to HH from the technical engineering forums, so no HH Template is shown >[/color] Hello everyone. I have such a task to fullfill. I am using dsa3307 Differential pressure scanner. Can someone give me an idea? How to achieve a result for this topic.."Implementation...

Homework Statement A container has neon gas in the temperature 273 K. We heat the container to the temperature 373 k, keeping the volume constant. Find the average velocity of the molecules of neon before and after the heat. Homework Equations U=3/2vRT The Attempt at a Solution I thought to...

Homework Statement So first the task: Determine the average value of the kinetic energy of the particles of an ideal gas at 0.0 C and at 100 C (b) What is the kinetic energy per mole of an Ideal gas at these temperatures. I took the above right out of the pdf we got from our professor. I know...

Hi. I'm trying to write some anatomical systems for a game I'm coding, and i need some good data to work from. Our game is about dogs, not humans, but i figure a human will be close enough What I'd really like is a case study of a specific organism, and i'd like to know the compositions, by...

Homework Statement Problem reads: In reaching her destination, a backpacker walks with an average velocity of 1.34 m/s, due west. This average velocity results because she hikes for 6.44 km with an average velocity of 2.68 m/s, due west, turns around, and hikes with an average velocity of 0.447...

Homework Statement The acceleration-time graph above is drawn for a body which starts from rest and moves in a straight line. The body is of mass 10 kg. Use the graph to find: (a) the average distance traveled in 15 s, (b) the average force acting over the whole 15 s period. Answers: (a)...

A 34 turn circular coil of wire has diameter 1.07 m. It is placed with its axis along the direction of the Earth's magnetic field of 60.0 µT, and then in 0.202 s it is flipped 180°. An average emf of what magnitude is generated in the coil? ε = − dΦB dt = −2Nπr 2B/dt = 16.95 when I used 3.14...

Homework Statement Given height dropped and gravity constant, what is the maximum and average velocity of an object dropped from a building. Gravity- 9.81 (Delta)y- 45 m. Height from which object is dropped T- 3.1 seconds Homework Equations V= v(final)-v(initial)= a x (delta)t V(avg)= (sqrt...

Homework Statement The wooden device is pulled apart by force P, determine the axial force P applied. The average normal stress is 2 ksi. Find the average shear stress along a-a. http://i60.tinypic.com/2vt1h8y.png Homework Equations τ = V/A σ = P/AThe Attempt at a Solution 2 ksi = P/A...

Homework Statement I have the total energy of a hydrogen atom E and need to take the average. The uncertainty in deltax=r so the uncertainty in deltap=hbar/2r The average values of x^2 and p^2 can be identified with the squares of the corresponding uncertainties, and the constant value of E is...

I have got a sample size of 1000 and I calculated the mean probability of success of an event by breaking this sample size into sets of 50 and also have the standard deviation and standard error of mean of this success. Now I repeat this process and have another set of data. What will be the...

In case of quantum LHO in eigen state of the system ##|n \rangle## \langle \hat{T} \rangle=\langle \hat{U} \rangle=\frac{1}{2}(n+\frac{1}{2})\hbar \omega What will happened in some superposition of states? Does Ehrenfest theorem can tell me something more general? Is it possible to say that...

I was wondering why the average kinetic energy is calculated in this manner. They are dividing the kinetic energy function by the period (noted here as To) and integrating it with limits from 0→To. Why? (This is a tiny portion of a larger textbook example, not an actual assignment.) Sorry for...

Homework Statement A rifleman is shooting at a target at a firing range. The rifle has a mass of 4.0kg. When the gun's trigger is pulled, a bullet of mass of 10g will exit the rifle's barrel at a speed of 800m/s. The rifle is stationary at the instant the trigger is pulled. Given that the rifle...

1. The temperature of air wil ... if we add a hydrogen molecule of a speed higher than 1980 m s/-1. 2. The temperature of air will ... if we take away a hydrogen molecule of a speed highr than 1980 m s /-1. 3. The temperature of air will ... if we take away a hydrogen molecule of a speed lower...

Homework Statement Diffusion coefficient (D) of 100 nm particles ( density = 1050 kg/m3) in a viscous solvent at 25 C is 2.2 x 10-13 m3/s What is the average shear rate at the particle surface? Homework Equations D = kT/ 6πηa (1) where k is Boltzman constant, T = temperature, ηsusp =...

Homework Statement Find the average velocity of shell while its moves a velocity v' and expands a velocity v. Sphere radius is R Expansion velocity v Movement velocity v' Homework Equations I think there's no need an equation.[/B] The Attempt at a Solution I try to find average velocity...

1. Excuse the dumb questions, I've just started learning physics outside my school course. If this forum doesn't allow this level of questions, then please point me somewhere else. 2. I'm also not sure if I'm allowed to post multiple questions that fall under the same topic, I didn't see...

Why is the average kinetic energy of the molecules a cold liquid less? As the temperature of a liquid decreases, the average kinetic energy of its molecules reduce. What is the reason behind this?

I have a question on the derivation of the average drift velocity in a conductor: drift velocity is the average velocity which a free charge moving in a conductor has due to the influence of an electric field applied to the conductor. In a metal, the free charge will be an electron. As they move...

Homework Statement the sun collapses to the size of the Earth (approximately 1/100 the original diameter), The current average rotation of the sun is approximately 30 days. Homework Equations what would be the new rotational period (time to spin once)? The Attempt at a Solution I know that in...

Homework Statement Find the average power dissipated in the 30 Ω resistor in the circuit seen in the figure if ig=7cos20,000tA. Homework Equations KVL/KCL equations P=VI* (possibly) or I^2(R) The Attempt at a Solution I tried to do a mesh, but got I∆(60-j130) = 0, which isn't right . . . I'm...

Homework Statement A patient receives an injection of 1.11×108 Bq of 131I,30% of which goes to the thyroid, having a mass of 20 g.What is the average dose rate in the organ? Homework Equations D=1.60×10–10AE Gy s–1 The Attempt at a SolutionA=(1.11x108x(30/100))/20=1.665x106Bqg-1 E=0.192Mev...

A patient receives an injection of 1.11×108 Bq of 131I,30% of which goes to the thyroid, having a mass of 20 g.What is the average dose rate in the organ? Solution: D=1.60×10–10AE Gy s–1 A=(1.11x108x(30/100))/20=1.665x106Bqg-1 E=0.192Mev =1.60x10-10 (1.665)(0.192Mev) = 51μGy s–1 This is...

[no template, as this post was moved from here from the Quantum Mechanics forum] In griffiths 2nd quantum mechnics, problem : Suppose I drop a rock off a cliff of height h. As if falls, I snap a million photographs, at random intervals. On each picture I measure the distance the rock has...

The following question came up when me and a friend of mine were discussing some basic things about probability:Let $p$ be a real number in $[0,1]$. Does there exist a sequence $(x_1, x_2, x_3, \ldots)$ with each $x_i$ being either $0$ or $1$, such that $$ \lim_{n\to \infty} \frac{f(n)}{n} =p...

I've got a homework question that I'm particularly stuck on: Suppose that the halo, assumed spherical, of non-baryonic dark matter surrounding our galaxy has mass ~ 5 x10^12 M solar and radius 0.1 Mpc. What it its average density in Kg m-3? I think that I need to use the formula...