Final Definition and 1000 Threads

Homework Statement A red ball is heading due east, a blue ball is moving due west, and a green ball is moving north. They have initial speeds vr,i=20 cm/s, vb,i=10 cm/s, vg,i=10 cm/s. The red ball has a mass of 5 g, the blue ball has a mass of 10g, and the green ball has a mass of 5g. The...

Homework Statement 75 mL of a pure liquid at 245 K is mixed with 100 mL of the same pure liquid 365 K. What is the final temperature? The answer is 314 K but I'm not sure why! Thank you! =) Homework Equations It says this problem has to do with Calorimetry but I'm not sure why...

A 0.25 kg ball is attached to a 26-cm piece of string. The ball is first raised so that the string is taut and horizontal, then the ball is released so that, at the bottom of its swing, it undergoes an elastic headon collision with a 0.21 -kg ball that is free to roll along a horizontal table...

Homework Statement Hey guys.. A train traveling at 40km/h accelerates at a rate of 5.0m/s^2 for 0.80s.what is its final speed. [b]2. Homework Equations [/b i believe this is the equation a=v1-v0/t The Attempt at a Solution Im totally stuck i tried but due to a lack of ti 84 i...

Homework Statement A 96 kg crate, starting from rest, is pulled across a floor with a constant horizontal force of 350 N. For the first 15m the floor is frictionless and for the next 15 m the coefficient of friction is .25. What is the final speed of the crate? Homework Equations...

Homework Statement A 505g piece of copper tubing is heated to 99.9 degrees C and placed in an insulated vessel containing 59.8g of water at 24.8 degrees C. Assuming no loss of water and a heat capacity for the vessel of 10.0 J/K, what is the final temperature of the system? (c of coppuer is...

I am stuck on my Physics work. I have already completed the first 10 questions but I do not understand these, can someone please help me with a method of how to find out. 1. When 0.25kg or water at 70C is mixed with water at 20C the final temperature of the mixture is 30C. find the mass of...

Homework Statement A spring with a spring- constant 3.4N/ cm is compressed 29cm and released. The 2 kg mass skids down the frictional incline of height 50 cm and inclined at 21 degrees angle. The acceleration of gravity is 9.8 m/s^2. The path is frictionless except for a distance of .07 m...

Hi I need an average this year of over 62%. I am in 4th year physiology and just lecture notes are not enough to achieve grades this high. What I am looking for are good tips that set a minority of students above the rest when marking exams. An example of a Question "Endothelial cells...

Homework Statement A trolley of mass 200 kg moves with velocity of 10 m/s on a friction less track. A child of mass 20 kg runs on the trolley with a sped of 4 m/s relative to the trolley in the direction opposite to the trolley's motion and jumps out of the trolley. What is the final speed...

This question was actually a 3 part question. I answered (a) and (b) correctly however I can't figure out how to calculate the 'final velocity of the skydiver'. Here are the givens: x axis v1 - 90 m/s acceleration - zero delta t - 10.6 seconds delta d - 958.5 m Y axis v1 = 0 delta t...

Has anyone read Final Theory: a Novel by Scientific American editor Mark Alpert?

So, the problem is: A 200-gram sample of dry air is heated isobarically. Its entropy increases by 19.2 J/K and the work done by expansion is 1.61x103 J. Solve for the final temperature of the air. Okay, since p=const => dq=CpdT thus instead of dq=du+dw we can write dq=dq(Cv/Cp)+dw can find...

I'm just going to my second year in the university as a physics major and I'm trying to beat time by starting research on my final year project(something new and involves both theoretical and experimental ideas) but i don't seem to get any ideas.please help.

Given the equations V2x= V1x+ax\Deltat and \DeltaX= V1x\Deltat+ 1/2ax\Deltat2, i need to derive the equation V2x2=V1x2+2ax\Deltat. please help me!

AOA i am in final year and i want to do my final year project on value-added telecommunication services.but i do not have much information about it. please guide me about this.

This promises to be a very difficult final round. Please vote for the picture that best represents our theme - a scene during dusk or dawn. Good luck to everyone. 1. Chi Meson 2. binzing 3. robertm 4. ~christina~ http://img512.imageshack.us/img512/6127/editsunsetresevk7.jpg...

We have some really awful pictures for you to vote on in the final round of this contest. 1. lisab http://img217.imageshack.us/img217/327/badkittytr9.jpg 2. turbo-1 3. Moonbear 4. GeorginaS 5. Evo http://img134.imageshack.us/img134/417/camerapictures295ae1.jpg 6...

Hi, I have a thermodynamics problem which I tried to solve but have no idea whether my attempt has been succesful. Here is the problem: Initially the translational root mean squared speed of an atom of a monatomic ideal gas is 250 m/s. The pressure and volume of the gas are each doubled...

Homework Statement A 1.5 cm tall object is placed 0.50 m to the left of a diverging lens with a focal length of 0.20 m. A converging lens with a focal length of 0.17 m is located 0.08 m to the right of the diverging lens. a)What is the location of the final image with respect to the object...

Homework Statement A sailor in a small sailboat sails 2km east, then 3.4 km NE, then an additional distance in an unknown direction. Her final position is 6.68 km directly east of her starting point. Find the magnitude and direction of the third leg of her voyage. The Attempt at a...

Homework Statement You are now familiar with the relationship between enthalpy, entropy, free energy and work. How does the universe end? Show the final equation. Homework Equations The only thing I can think of that might be relevant is \Delta G^{\circ}= \Delta H^{\circ} \ - \ T \Delta...

This promises to be a very difficult final round. You have one vote to cast on the picture that best represents our theme - clouds! 1. hypatia 2. Alex:) http://img224.imageshack.us/img224/5396/mousilaukecloudug1.jpg 3. Andre 4. Borek 5. Air 6. larkspur...

m1 = 5, v1i = +10 m2 = 3, v2i = 0 +y |_+x How do I find v1f and v2f? The balls crash into each other and after the crash I want to know the final velocity.

Hi I'm a final year EE student and its time for me to do my project.I've thought of a topic nd thats- "Inverter design for solar cells" but i don know wher to start nd how to proceed. can any of u provide me circuit diagrams with explanations, or any links to such sites.since this is a general...

A glider of mass 0.147 kg is moving to the right on a frictionless, horizontal air track with a speed of 0.720m/s . It has a head-on collision with a glider 0.309 kg that is moving to the left with a speed of 2.26 m/s. Suppose the collision is elastic. Find the magnitude of the final velocity of...

Homework Statement A 3.00kg object has velocity 7.00j m/s. Then, a total force 12.0i N acts on the object for 5.00s. Find the final kinetic energy from 1/2mvf^2 = 1/2mvf . vf Homework Equations The Attempt at a Solution i got 1/2 * 3 * (20i+7j)(20i+7j) then 600j^2 + 210ij +...

A ball (A) is launched straight down from a cliff while another (B) is launched straight up from the floor of the cliff. The final velocity for ball A is the inital velocity for ball b. Where will they cross paths? Up high, in the middle or down low? Also, 2 balls are launched upwards...

Homework Statement given: m=1.0x10^4kg a relative speed of 1200m/s t=2.0 F=25kN pi=? pf=? Homework Equations The Attempt at a Solution (-25*10^3)(2.0)=(1.0x10^4)(1200)+(1.0*10^4)(mvi)

Homework Statement I just gave my physics final and i want to confirm if my answers are correct the kinetic energy of a particle is increased by factor 4 how much will linear momentum will increase show mathematical steps how much is the power output of the engine of a 1000 kg car can go...

Whit is the final speed of an electron accelerated through a potential difference of 200 V if has an initial speed of 2.0 x 10^6 m/s. (Charge of electron = 1.6 x 10^-19 C and mas of electron = 9.11 x 10^-31 kg)

Homework Statement Hi :smile: Find the (finite,ultimate,definitive,peremptory,eventua,conclusive) sum: a) cos^2x+cos^22x+...+cos^2nx ; b) sin^2x+sin^22x+...+sin^2nx Homework Equations z=A+Bi The Attempt at a Solution A=cos^2x+cos^22x+...+cos^2nx...

[SOLVED] Work Done and final temperature of 5 mols of Ideal Gas Homework Statement Five moles of an ideal monatomic gas with an initial temperature of 129 degrees Celsius expand and, in the process, absorb an amount of heat equal to 1160 Joules and do an amount of work equal to 2020 Joules...

[FONT="Georgia"][SIZE="3"]Homework Statement A spaceship of mass 2000000kg is moving with a constant velocity of 3.0 \times 10^4 ms^{-1}. It is suddenly hit by a mysterious force of 8.0 \times 10^{10}N for 10s in the opposite direction to its motion. What is the final velocity and direction of...

URGENT: Complex Numbers Problems: HELP NEEDED FOR MY FINAL EXAM!? Q1: Write the numbers in the form a+b: i) (2+3i)/(1+2i) - (8+i)/(6-i) ii) [(2+i)/(6i-(1-2i))]^2 Q2: Simplify: i) i^11 ii) i^203 Q3: Show that the points: 1, -1/2 + (i*squareroot(3))/2, -1/2 -...

BAM! Finally got my final grade in "University Physics I" My Cal 3 grade was up pretty quickly after the final. I got an A in that. But the PHYS 2425 Mechanics and Heat or "University Physics I" took almost a week after the final. I got an A in that, too. :smile: It was my first physics course...

Homework Statement A copper calorimeter can with mass 0.100 kg contains 0.160 kg of water and 0.018 kg of ice in thermal equilibrium at atmospheric pressure. If 0.750 kg of lead at a temperature of 255^{o}C is dropped into the calorimeter can, what is the final temperature? Assume that no...

I am working on a final project for my AP Physics class and must do some research on Relativity. I just have a few questions and was wondering if anybody could answer them for me. It would be greatly appreciated! 1. Assuming that traveling at the speed of light were possible, "time" would...

Homework Statement find the final temperature of A 150g (0,15kg) cube of ice at 0.0 degrees Celsius is added to 300g(0.3 kg) of water at 50.0 degrees Celsius. Specific heat capacity of ice: 2.09 x 10^3 J/(kg x degrees Celsius) Specific heat capacity of water: 4.186 x 10^3 J/(kg x...

Homework Statement A container has a 100 cm^2 piston with a mass of 10 kg that can slide up and down vertically without friction and is placed below a heater. Suppose the heater has 25 W of power and are turned on for 15 s. What is the final volume of the container? Initial Volume: 800 cm^{3}...

My final exam is tuesday and I am having an extremely extremely hard time grasping arrays and strings. I just can't visualize how they work and I am stuck on how to get my printOwnedShares function to work properly in a project that will help me study for the final. This is what I have worked on...

Quick question on 3 phase before my final! Homework Statement In equations for 3 phase power there is an angle that is mentioned, but I don't know if this is the angle of the impedance or another angle. I am a little confused. The equations are below. Homework Equations...

Homework Statement An insulated container is filled with 250g of water at 90degrees Celsius. Which of the following, when added to the hot water, will result in the lowest final temperature of the mixture? A. 10g of water at 0 degrees C B. 125g of water at 75 degrees C C. 15g of water at 0...

There is an E-field in a region of space, and a +55.0 nC charge is placed at a point where the potential is 535 V. When released the charge moves, while the field does 210.0 µJ of work on it. What is the potential of the final location of the charge?

Homework Statement Hi, I'm trying to simulate an electrostatic craft going from low Earth orbit to a geostationary orbit, but I'm having some trouble with matlab. I'm not the most confident programmer at the best of times, but needs must and so I've given it a go. As far as I can tell my...

No matter which photo we all vote for, I think we all can agree that this will be a very tough choice for the final round. So a round of applause to all those who made it this far. Please vote for your favorite dog photo. 1. _MayDay_ http://img230.imageshack.us/img230/8972/pie5ho1.jpg...

[b]1. A top is a toy that is made to spin on its pointed end by pulling on the string wrapped around the body of the top. The string has a length of 64cm and is wound around the top at a spot where its radius is 2.0 cm. The thickness of the string is negligible. The top is initially at rest...

Question is a golf ball is dropped from a height of 78m assuming gravity is 9.8 m s, What is the velocity of the ball after the first 10m. I assume the equation to use is v^2=u^2+2ax v = Final velocity u = Initial Velocity a = Acceleration x = Displacement So I plug in v^2 =...

Homework Statement Chris jumps off a bridge with a bungee cord tied around his ankle. He falls for 15m before the bungee cord begins to stretch. Chris's mass is 75kg and we assume the cord obeys Hooke's law F = -kx, with k=50N/m. If we neglect air resistance estimate how far below the bridge...

I am doing a lab in which I have to come up with my own procedure. The lab involves putting a hot metal into water, then using calorimetry calculations to find the mass of the metal. (The metal is hotter than the water). What I don't understand is how you know when to stop taking the final...