Final Definition and 1000 Threads

Homework Statement For the following integral, find F and its partial derivatives and plug them into the Euler Lagrange equation $$F(y,x,x')=y\sqrt{1+x'^2}\\$$ Homework Equations Euler Lagrange equation : $$\frac{dF}{dx}-\frac{d}{dy}\frac{dF}{dx'}=0$$ The Attempt at a Solution...

Homework Statement Two bodies are standing still upon a surface without friction. The mass of body 1 is bigger than the mass of body 2. i) A constant force is applied to body 1, so it accelerates in a segment to a distance d. The force stops being applied to body 1, and is applied to body 2...

Homework Statement We have a ramp with some angle theta. The metallic bar sitting on a ramp at height h. Also, we have some weight that attached by a rope to a metallic bar while hanging on the height h. There is a magnetic field with a magnitude B and direction k. M = metallic bar m = weight...

Hi, people, New to the forum here. Not sure if this is the correct place to post this sort of thing or not, but hopefully it can be moved if necessary! Anyway, I have an intermediate mechanics final on Thursday, and I need some serious guidance on the best way to prepare. Our textbook is...

Homework Statement A cart mass of M moving at 3V (right) collides with a stationary mass of M, Determine the ratio of the two final velocities if the collision is elastic Homework Equations p=mv ek=(mv^2/2) The Attempt at a Solution m1v1=m1v1'+m2v2' Since the masses are all equal and v1 is...

Homework Statement Soda from a ms=12 oz can at temperature Ts=13 degrees C is poured in its entirety into a glass containing a mass mI=0.16kg amount of ice at temperature TI=-19.5 degrees C. Assume that ice and water have the following specfic heats c1=2090 J/(kg*C) and cs= 4186 J/(kg*C), and...

Homework Statement A skateboarder at a skate park rides along the path shown in (Figure 1) .If the speed of the skateboarder at point A is v=1.3m/s, what is her speed at point B? Assume that friction is negligible. Homework Equations ui+ki=uf+kf u=mgh k=1/2mv2 The Attempt at a Solution...

Homework Statement At a fair, Hank and Finn play with a horizontal 5.4 m long bar able to rotate about a pole going through its exact center. Hank pushes with 32 N at one end of the bar and Finn pushes with 18 N in the opposite direction at the other end. (Assume both forces are always...

Homework Statement The internal energy of air is given, at ordinary temperatures, by ## u= u_o + 0.718t ## where ##u## is in kJ/kg, ##u_o## is any arbitrary value of ##u## at 0oC, kJ/kg, and t is temperature in oC. Also for air, ##pv= 0.287(t+273)## where p is in kPa and ##v## is in m3/kg...

Homework Statement What is the final position of the object if its initial position is x = 0.40 m and the work done on it is equal to -0.19 J? Homework Equations work(J)= Fx ΔX The Attempt at a Solution I do not know where to begin? please give me a hint where to begin.

Homework Statement 1/ A committee of 6 is selected from 10 people, of whom A and B are two. How many committees can be form excluding A if B is included ? 2/ A committee of 5 is to be chosen from 6 boys and 4 girls. How many committees can be form containing a particular boy X but excludes a...

Homework Statement A hockey puck of mass 0.16kg has initial velocity of 2.0m/s[E] and collides with another puck that is initially at rest, has mass of 0.17kg. Once they collide the first puck travels 1.5m/s[N 31 E]. Find final velocity of second puck. Homework EquationsThe Attempt at a...

Homework Statement The figure shows a two-ended “rocket” that is initially stationary on a frictionless floor, with its center at the origin of an x axis. The rocket consists of a central block C (of mass M = 6.40 kg) and blocks L and R (each of massm = 1.90 kg) on the left and right sides...

Homework Statement A block of 10 kg is pulled by a force of 100 N at and angle 30 degrees above the horizonal through a distance of 4 meters. Kinetic friction has a coefficient of 0.3. How much work does friction do in that distance? If its speed is 3 m/s at point a, what is its speed at point...

Homework Statement Bob passes a 0.220kg puck with an initial velocity of 12m/s [South] to Dave. Dave one-times the puck with a force of 368N [N30E] if Daves stick is in contact with the puck for 0.250s what is the final velocity? Homework Equations i honestly don't know where to start with...

Homework Statement A rock is thrown from a cliff that is 50m long with an initial velocity of 7m/s and an angle of 53, find the rock's veloctity before it hits the ground Homework Equations vfy=sin(theta)*vi-gt vf^2=(vi*sin(theta))^2-2gy The Attempt at a Solution x=vi*cos()t t=x/(vi*cos)...

I am in my last year as an undergrad and will be graduating in the spring with a BS in Physics. I personally have terrible grades this including overall GPA and major specific GPA (currently around a 2.2 for both). At this point, bringing my GPA up is nearly impossible without some post...

Homework Statement In the circuit shown in the figure, C1 = 1.0 µF, C2 = 1.9 µF, C3 = 2.8 µF, and a voltage Vab = 30 V is applied across points a and b. After C1 is fully charged the switch is thrown to the right. What is the final charge and potential difference on each capacitor? Homework...

Homework Statement You are driving your 1000-kg car at a velocity of(19 m/s )ι^ when a 9.0-g bug splatters on your windshield. Before the collision, the bug was traveling at a velocity of (-1.5 m/s )ι^. What is the change in velocity of the car due to its encounter with the bug?Homework...

Homework Statement I have to do a calculation in electronvolt, using physical constants. The final result must be in electronvolts. I can grab the physical constant from scipy (python library). How do I know which constants I can keep in SI units, and which constants I have to transform...

Homework Statement If the Helmholtz Free Energy remains constant, estimate the final pressure of 1.0mol of an ideal gas in the following transformation: (1.0atm, 300k) → (pfinal, 600k). Given Sgas = R. Homework Equations A = U - TS dA = -SdT - pdV The Attempt at a Solution If the Helmholtz...

Homework Statement Homework Equations \frac{1}{p}+\frac{1}{q}=\frac{1}{f} The Attempt at a Solution I already had this typed in word so here is a screen shot: I don't understand why the negative is omitted in the "correct answer" "B." In solving this problem I wanted to proceed in...

I feel the need to make sure my Dobsonian scope is working at its best. I was considering a conventional (?) red LED collimator but I suddenly begin to see these Artificial Stars on sale. Would that be a better way to go? Anyone have experience of them? Looking at real stars tells me that the...

Homework Statement Hi I know my picture has 2 problems, but let's just focus on the first problem parts a and b. So for part a it ask for the final frequency after the ant landed, and part b is the kinetic energy difference. Basically the ant=.01kg, diameter of cylinder is .115m, the weight of...

Homework Statement [/B] (a) Write down sucient number of equations to determine all the currents i1, i2 and I (you do not need to solve the equations) (b) At the instant the battery is turned on, what is the current I running through the circuit? (c) After waiting for a suciently long time...

Hi guys, new member here. I am entering my final year of university and really want to give it my best shot. Have people on here or anywhere else ever got 90% or above average in their module marks for final year? My final year involves optics, solid state physics, statistical mechanics...

Homework Statement Two balls collide in a perfectly elastic collision. Ball 1 has a mass of 3.5kg and is initially traveling at a velocity of 5.4m/s. It collides head-on with stationary ball 2 with mass 4.8kg. Determine the final velocity of ball 2. Given: m1=3.5kg vi1=5.4m/s m2=4.8kg...

Homework Statement Compute the following parameters of the final image formed by the lens system shown in the figure below a) position b) size c) nature (Real, Virtual, Upright, Inverted, Etc.) Homework EquationsThe Attempt at a Solution i am kind of lost at where to begin...

Homework Statement A 1000kg car is moving at 25ms when a net force of 200N acts to slow the car. This force acts while the car moves through a distance of 300m. Find the new speed. Homework Equations Kinetic Energy equation v2=u2+2as The Attempt at a Solution Attempted the use of Kinetic...

Homework Statement Two freight trains have a completely inelastic collision at a track crossing. Engine 1 has a mass of 1.4x10^4 kg and is initially traveling at 45 km/h [N]. Engine 2 has a mass of 1.5x10^4 kg and is initially traveling at 53 km/h [W]. Calculate the final velocity. Homework...

Homework Statement Cart 1 has a mass of 1.5 kg and is moving on a track at 36.5 cm/s [E] toward cart 2. The mass of cart 2 is 5 kg, and it is moving toward cart 1 at 42.8 cm/s [W]. The carts collide. The collision is cushioned by a Hooke's law spring, making it an elastic head-on collision...

So, great site. I have a quick question that I think has a simple answer. On a snowmobile forum I visit there has an ongoing debate. The question is, all other factors being the same, does changing the lug height on a track, change the final drive ratio of the snowmobile? I think I know the...

I know there are a few ways the universe can end, if it ever does, but at what temperature would the universe be in after heat death?

Hello guys. I've seen a lot of differing opinions on this site. I'm a middle schooler with a decent understanding of basic calculus, trig, and algebra. I want to learn physics, and am wondering if The Feynman Lectures supplemented with problems from Irodov and some of Walter Lewin's lectures...

Homework Statement What will be the final velocity of a proton (when it is very far away) if it it released from rest at the center of a uniformly charged hoop and given a slight push in one direction. assume it follows the axis of the hoop. mass of proton: m = 1.67x10-27 kg charge of proton: q...

My homework problem is as follows: Consider the Laplace transform shown below. (4s3+15s2+s+30)/(s2+5s+6) a. What is the value of f(t=0) and f(t=∞)? Use the initial and final value theorems. b. Find the inverse transform f(t). Use this expression to find f(t=0) and f(t=∞) and compare with the...

Homework Statement A container contains a given mass of ice and a given mass of water both at 0 degrees Celsius. A given mass of aluminum is heated up to some temperature and submerged in the water-ice mixture. No heat enters or leaves the container. Given the specific heat of water and...

Homework Statement The Drop Zone drops riders 27m from rest before slowingthem to a stop. How fast are they moving before they start slowing down? vf=? vi=0, di=27m[up], df=om, displacement=27m[down], acceleration=9.8m/s^2[down] Air resistance is negligable Homework Equations...

Homework Statement Golf ball struck with a velocity of 66 ft/s. Part a): determine the speed at which the ball hits point B. Part b): determine the time of flight from A to B. Homework Equations For Part b): (Vo)x = Vcos(θ) (Vo)y = Vsin(θ) D = Do + (Vo)x * t Y = Yo...

Homework Statement I had a rather tough multivariable calculus final, and the class was creamed by it. Apparently the professor thinks a 40% average is okay. But here is a portion of the problems. Please help me solve 'em. I'm not exactly sure if I'm taking the right path in these, but I did...

Homework Statement Three blocks of identical mass are placed on a frictionless table as shown. The center block is at rest, whereas the other two blocks are moving directly towards it at identical speeds v. The center block is initially closer to the left block than the right one. All motion...

Homework Statement An object of mass m is allowed to slide down a frictionless ramp of angle Θ, and its speed at the bottom is recorded as v. If this same process was followed on a planet with twice the gravitational acceleration as Earth, what would be its final speed? Multiple Choice...

Homework Statement I am tasked with finding the theoretical final speed of a car rolling down a hill using energy calculations. I am given the angle of the incline, the height of the ramp, the length of the hill (horizontal and actual length) and the mass of the car. Also, the car is starting...

Is it ok to email a professor asking them to confirm your grades to this point e.g. you send them all your homework grades and midterm grade in case of error and ask them about your final exam score? Would this be nagging and or condescending. Wouldn't want to hurt my image just before final...

Hey, how's it going! Just a little confused about how to do the problem below. Any help would be appreciated! 1. Homework Statement A satellite of mass m=100,000 kg is moving around the Earth in a circular orbit at an altitude of 100,000 feet above the surface. If the satellite were stopped and...

Homework Statement [/B] Person A fires a 222 g arrow towards an archery target at a speed of 109 m/s. Person B shoots a 190. g arrow moving in the same direction. This arrow moves with a speed of 290. m/s, catches up, and then collides with Person A's arrow. If the arrows collide in a...

I'm writing a class to format console output and the trickiest method in this class so far is the one for printing a table. I'm having it act like an HTML table in how text fits public static void PrintTable ( string[][] cells ) { // Outputs content in cells matrix...

Homework Statement A gas has the following equations of state: P=\frac{U}{V} \,\,\,and \,\,\,T=3B\frac{U^{\frac{2}{3}}}{N^\frac{1}{3}V^\frac{1}{3}} where B is a positive constant. The system obeys the Nernst Postulate (S tends to zero as T tends to zero). The gas, at a initial temperature T_i...

Homework Statement [/B] Three point charges are arranged as shown here: http://puu.sh/ltvxF.png a. Find the electric field at point A. (Give as vector, either as i and j or magnitude and direction.) b. Find the potential at point A. c. If an electron is placed at point A and released, what is...

Homework Statement Assuming no heat loss to the container or the environment, what is the final temperature (K) of a mixture of 9.28L of liquid 1 (density=1070kg/L & specific heat capacity of 4358J/kg/K) at 378K and 12.15L of a second liquid (density=1070kg/L & specific heat capacity of...