Final Definition and 1000 Threads

Homework Statement Need a second person to help verify if answer is correct. Copper with a mass of 300 g initially at 200 °C is added to water with an initial temperature of 10 °C and mass of 500 g. What is the final temperature of the system when they are in equilibrium? ANSWER must be in...

Homework Statement Hello! This is my first time posting here but I have been viewing these forums for help in my physics class for a while. Lately I have been stuck on one single problem that I haven’t been able to find any help with anywhere online. Any who, here is the problem: a cat...

Homework Statement In the last second of a hockey game, a player slaps the puck in the empty net 32.5 m away. The puck leaves the stick with the speed of 41.5 m/s. Calculate the final velocity of the puck if its mass is 0.17 kg.Homework Equations μK = 0.005 μK = FK / FN F = ma v22 = v12 +...

Homework Statement A thermally isolated container is filled with 2.3 mol of an ideal gas at T = 0°C.The gas is then compressed from 1.9 m3 to 0.3 m3. What is the final internal energy U of the gas? (Assume the process occurs at constant pressure.) Homework Equations U=3/2nRT U=Q+W W=pΔV...

Hi Guys, I'm new to the forum so please be gentle with me. I am a final year mechanical engineering student in Ireland and i am doing my final year project on reduceing solidification cracks that are occurring in a weldment of a NI-Super alloy during the welding process. I believe that a...

Greetings Fellow Physics lovers! I was wondering if somebody could please check my work on this problem. A 5 kg block traveling at 10 m/s collides into a stationary 2 kg block. Find the final velocities of the two blocks after the elastic collision. V1f=(m1-m2)/(m1+m2) (V1i)...

Homework Statement The body B = f(x; y; z) belongs to R3, x^2+4y^2+3z^2<or equal to 3, x> or equal to 0 y> or equal to 0 z> or equal to 0 The body B has a volume density: M(x,y,z)= (xyz^2)/(1+x^2+4y^2+3z^2) Calculate the total mass and average density of the body. Sorry if...

Homework Statement Calculate the final velocity of a rocket if the velocity of the ejected gas is c, initial mass of rocket is M0 and final mass is Mr, v0=0. Homework Equations We have to calculate the final velocity of rocket. The Attempt at a Solution Because the total momentum...

1. Two small metal spheres with masses 2.0g and 4.0g are tied together by a 5cm long massless string and are at rest on a frictionless table. Each sphere has a (mue)c charge. The string is cut, what are the velocities of the sphere when they are far apart I know two conservative qualities are...

http://fourier.eng.hmc.edu/e102/lectures/Laplace_Transform/node17.html On that page about final value theorem, it says that; However at the bottom of the page, in order to find the DC gain, it uses Final value theorem. Ok, well, let's assume somehow he put "0" where he saw "s". How...

A compressor is being used to adiabatically pressurize three moles of ideal gas from 5 bar and 150 C to 50 bar. Determine the minimum work that must be supplied to the compressor and the outlet temperature of the ideal gas. Assume the ideal gas has a constant pressure heat capacity of 29...

'Guess I'll start the thread for this one too. Use this thread for commentary on the 3rd (final) Presidential Debate. It starts at 9PM EDT Oct 22nd. Please keep debate of issues to a minimum and focus on observations relevant to the debate itself. Have a nice day :) I'll be watching it...

Homework Statement Ok, the problem says some rocket of mass M0 has this new technology that allows it to convert photons into fuel. It reaches a speed of .5c. The problem asks us to solve for the final mass of the rocket, and then assume that all the lost mass was converted into photon fuel...

Homework Statement I am having trouble working out the change in Entropy. The question is as follows: A mass of 1 kg of air is initially at 4.8 bar and 150 degC and it is enclosed in a rigid container. The air is heated until the temperature is 200 degC. Calculate the change in entropy...

A piece of ice with a mass of 60 g is transferred directly from the freezer at a temperature of –7°C to a polystyrene cup containing 200 g of water at 75°C. Calculate the final temperature of the water. Ignore any heat loss to the cup and its surroundings. Qheat ice + Qmelt ice + Qheat cold...

Tricky problem worth 2 points on my final grade :) Homework Statement Homework Equations I honestly don't know how to tackle this. I think it's going to contain ƩF=mg, and some basic kinematic equations. The Attempt at a Solution Where do is start?

Homework Statement The radius of Mercury (from the center to just above the atmosphere) is 2440 km (2440103 m), and its mass is 0.31024 kg. An object is launched straight up from just above the atmosphere of Mercury. (a) What initial speed is needed so that when the object is far from Mercury...

Homework Statement http://imgur.com/fGYf0 Stuck on #3 Homework Equations V = Vi + a*t Y = (1/2)gt^2 + (ViY * t) + Yi The Attempt at a Solution I have found the vertical and horizontal components and the initial velocity. ViX = 6.2 ViY = 9.922 Vi = 11.7 Yf = 0 Yi = 7 Xi =...

Calling in all Electrical Engineers- Final Year Project help needed! I needed some help from you guys regarding my Final year project. Basically my project is about a hydrogen fuel cell that charges the batteries in cars, its a hybrid system. The fuel cell is PEMFC (proton exchange membrane...

If someone or a few people, just look this over and tell me if I'm right or if I did something wrong I'd be so grateful. I think it's all there but I'm not sure, there might be something off. Homework Statement Air (which behaves like an ideal gas) undergoes adiabatic expansion in piston...

Hey, guys. I am currently in a Thermo I class and have ran into a problem that has me completely stumped. I have worked in numerous different ways and anything I come up with doesn't seem to make since or be realistic. Here's the question: Two rigid vessels are connected by a small valve and...

Homework Statement A hydrogen atom in an excited state absorbs a photon of wavelength 434 nm. What were the initial and final states of the hydrogen atom? Homework Equations 1/λ=1/91.127 * (1/nf2-1/ni2) The Attempt at a Solution Tried to use the equation, but keeping the initial...

Homework Statement This is a homework that has me completely stumped. If anyone help me out here, I would greatly appreicate it. A billard ball is east at 2.0 m/s. A second, idential ball is shot west at 1.0 m/s. The balls have a glancing collision (not head-on), deflecting the second ball...

Homework Statement A 2.8 kg sample of a metal with a specific heat of 0.43KJ/KgC is heated to 100.0C then placed in a 50.0 g sample of water at 30.0C.* What is the final temperature of the metal and the water? Homework Equations heat loss by the metal = heat gain by the water The...

Homework Statement In a first order decomposition in which the rate constant is 0.03 sec-1, how much of the compound (in mol/L) is left after 39 sec, if there was 2.00 mol/L at the start? I'm using a few equations and trying to plug it in but I don't know whether they are appropriate or not...

Situation: A uniform cylinder (Mass M, Radius R) is rotating down a slope of incline θ and distance s, there are two methods which I used to calculate the final speed, one of which considered forces acting on the cylinder and the other using energy, pure rolling assumed throughout, both give...

1.A tennis ball is dropped from 1.3 m above the ground. It rebounds to a height of 0.956 m. With what velocity does it hit the ground? The acceleration of gravity is 9.8 m/s^2 (Let down be negative.) Answer in units of m/s 2.With what velocity does it leave the ground? Answer in units of m/s...

Homework Statement One mole of an ideal monatomic gas initially at volume Vi and temperature 1000k expands to a final volume Cvi in three reversible steps: 1) isothermal expansion from Vi to aVi, 2) adiabatic expansion from aVi to bVi and 3) isothermal expansion from bVi to Cvi In terms...

I am biomedical enginerring student, I am working to gather Ideas for my graduation project and I will appreciate if anyone provides me with some ideas and some relaible sources (if any) for any innovative biomedical engineering project

Homework Statement S is a lighted object, height=1. what is the final image that is created by the system? Homework Equations The Attempt at a Solution i just don't understand how do i find the location of a virtual image created by a negative lens when the rays converge to a...

Homework Statement a human cannonball in 1940 soared over three ferris wheels, each 18 meters high covering a horizontal distance of 10.63 meters. Assuming that the point of projection is 2.50 meters above the ground and that he landed safely on a net placed at the same level, find his initial...

These exams are merely help for studying for the final in this class. Completing them will not give me any credit whatsoever or affect my grade in the course. The only problem is that our instructor did not give us answers to the tests so we have no idea whether or not we worked the problem...

Hi I have a known volume of water with a known concentration of calcium. I want to bring that volume up to a new (slightly) higher volume with a new (slightly) higher concentration. To do this I am adding a solution with a known concentration of Ca but cannot remember how to calculate the...

Homework Statement Given a tank filled with gas, you are to pump out a given amount and find the final state of the tank. Given the volume, gas (non-ideal), amount of gas in tank, flow rate, temperature and pressure, all at state 1. We can find density at state 2 from the tables, but we need...

hi guys I am swamp with work and have not been able to go through my assignments proper [b]1. one cube meter of an ideal gas at 600K and 1000Kpa expands to 5 times its initial volume: by mechanically reversible, isothermal process and by a mechanically reversible, adiabatic process...

Finally. Federer to face Murray in Wimbledon final http://www.usatoday.com/sports/tennis/story/2012-07-06/wimbledon-mens-semifinals-roger-federer-novak-djokovic-andy-murray/56059932/1

Homework Statement The Problem is as follows :- https://fbcdn-sphotos-a.akamaihd.net/hphotos-ak-snc6/224892_2277870043526_218311126_n.jpg Three capacitors of 2 μF, 3μF, and 5μF are indulgently charged with batteries of emf’s 5V,20V and 10V respectively. After disconnected...

Homework Statement A hockey puck of mass 0.200kg is sliding along a smooth, flat section of ice at 18.0m/s when it encounters a patch of snow. After 2.50s of sliding through the snow it returns to smooth ice, continuing at speed of 10.0m/s. a) What is the change in momentum of the puck...

Homework Statement Mass= 15g Q1= 8.0uC Q2= 25 uC (stationary) Q1 is released from a point 12cm from Q2. How fast will Q1 be moving when the separation is 20cm. Homework Equations F=ma F=qe F=kQq/r2 E=kQ/r2 Ke=mv2/2 W=FD vf2=vi2+2ad The Attempt at a Solution...

What's going on, guys. I have a Physics final tomorrow, and I don't understand these! "What is the frequency of a wave that has a speed of 3 m/s and a wavelength of 8 m?'' "What is the period of a wave that has a frequency of 5 Hz?" I'm assuming they're all simple, so if someone can...

Homework Statement A 155-g piece of copper at 188oC is dropped into 250.0 g of water at 23.7oC. (The specific heat of copper is 0.385 J/goC.) Calculate the final temperature of the mixture. (Assume no heat loss to the surroundings.) Knowns. 155g Copper Initial Temp 188 C 250.0g Water Initial...

Homework Statement At low temperatures, Cv of solids is given by: Cv = D(\frac{T}{\Theta})3 where: D = 1.94*10^3 \Theta = Debye Temperature, for diamond 1860K If 100J of heat is transferred to 1mole of diamond, initially at 10K. Calculate the final temperature. Homework...

I've been doing a lot of readings on NLO calculations for high energy physics, and several papers I have read mention "Born final state" particles, "Born level" processes/trees/diagrams etc. None of them seem to define them, however, and my searches on the Google and in textbooks have been...

Hopefully one of you guys can help me out.. I'm designing a burner that will run off powdered biofuel and I'm trying to calculate the resulting temperature after combustion. I have a higher heating value (HHV) of around 10,000 BTU/lb for the biofuel and for a complete stoichiometric...

Homework Statement If it is eg. two balls, both going to the right before and after an elastic shock, how do you determine their velocities after the collision? (speeds before and weights are given) Eg. M = 50 kg u1 = 20 m / sm = 100 kg v1 = 10 m / s (M, m = mass) (u1, v1 = velocity before...

Homework Statement calculate the final temperature when 20 grams of steam at 100°C is added to 100 grams of ice at -40°C. Homework Equations Q=mcΔt and Q=ML The Attempt at a Solution I tried solving this problem using -ΔQheat = ΔQcold, but the final temperature that I found was past...

This is it. 9 years, 11 months, 16 days of active duty Air Force and today is my final day. It's been good and bad. I'm looking at going reserve and moving to Tuscon to go to the University of Arizona to do Optical Engineering if everything goes well. Off to my final out appointment! SSgt...

Hello y'all. My biology term final exam is this Friday. It's not mandatory for me because I have a good grade. But I'm going to take it anyway. For some reason, my teacher Mr. Mannara did not prepare a study guide. He said so himself. For every test I've taken in his class that was...

Here's an example >> R(1) ans = -log(- 1004229921906619062839952526185507/1913851274991446601508198548841385*i - 143584884070040384103267078403784/1913851274991446601508198548841385) i want to know the value of R(1) R is a 3x1 matrix, and R(1) will display the result in R(1,1)...

i don’t understand how they got this answer can you please explain the steps needed to fine the Final T and How the final P was found. thanks N2H4 + 3O2 ==> 2NO2 + 2H2O assume there are 60 moles of O2, what is the final T and P V = 20L T1 = 290K n (N2H4) = 20 Cp = 57 kJ/C...