Final Definition and 1000 Threads

Why is the final air pressure equal to the initial air pressure?

Homework Statement A ball of clay of mass m travels with velocity v in a path tangent to a disk of radius R and mass M. The clay collides with the disk tangentially to its outer rim (a totally inelastic collision) and the clay and disk begin to spin about the axis. What is the final angular...

Did I solve this correctly? I'm not sure if my method is correct. Homework Statement A metal cylinder with the specific heat c_{cylinder} and mass m_{cylinder} is warmed up to temperature T_{cylinder} and then cooled down by putting it into water which has the temperature T_{water} and mass...

Homework Statement The "steam" above a freshly made cup of instant coffee is really water vapor droplets condensing after evaporating from the hot coffee. What is the final temperature of 290 g of hot coffee initially at 90.0°C if 1.50 g evaporates from it? The coffee is in a Styrofoam cup...

Dear Advisor, I tried to read books and searched all around before posting new topic here... I'm carying out testing a hoisting winch at load 400 kN through a system as in picture. My problem is that due to fiber rope i only can measure exactly wire tension by a load cell installed through...

Homework Statement Rxn: 2SO2 (g) + O2 (g) \Leftrightarrow 2SO3 (g) If the initial concentration of SO3 is .500 M (moles/liter) @1500K, what are the final concentrations of [SO2], [O2] and [SO3]. Kc = .15 Stop when you get to the cubic equation Homework Equations RICE table...

Homework Statement A marble is released from a 10cm ramp. Its final velocity is 1.4 m/s. If it is released from a 20cm ramp, twice the height, what will its final velocity be? Homework Equations E = mgy + mv^2/2 mgy = mv^2/2 (Like initial gravitational potential energy will equal final kinetic...

Homework Statement An amount of steam undergoes a constant volume process from an initial state for which the pressure and temperature are 0.1MPa and 350°C respectively. The final temperature is 300°C. Using linear interpolation estimate the final pressure. Homework Equations Use...

Homework Statement 22. A 5.00 x 10^4 kg shuttle is orbiting the Earth 2.45 x 10^7 m above its surface. What is the Earth's gravitational field strength at this height. a.)9.80m/s^2 b.) 1.29m/s^2 c.)0.418 m/s^2 d.)0.39m/s^2 23. What is the force of gravity between the shuttle and the...

I was reading The History of Physics by Isaac Asimov, and I came across this passage. "Imagine a body dropped first from a height of 1000 kilometers, then from 2000 kilometers, then from 3000 kilometers, and so on. The drop from 1000 kilometers would result in a velocity of impact v_{1}. If...

24.100kg of copper at 33.000 degrees Celsius receives 310.000 kJ of heat. Calculate the final temperature of the metal. Homework Equations Q=mc(t2-t1) The Attempt at a Solution I solved the equation for T1 T1=c*m*Q-T2 / C*m The answer however seems really small and...

Hello all, I am new to PF; this is my first post. I am currently taking a physics class on electricity and magnetism. I am trying to find an equation to calculate the final position of a charged particle p, given that there are n other particles. Known: + initial (positions and...

Homework Statement Homework Equations See below The Attempt at a Solution Ok, I have been working on this problem for almost 2 hours now and I just can't see where I'm going wrong. I tried it twice and got the same answer both times, so clearly I'm doing something wrong...

A Carnot engine is operating between a source and a sink at temperatures T1 & T2 (T1>T2) respectively.. The heat capacities of the source and the sink are equal. Find the final temperature attained.

Homework Statement I just solved how much heat is needs to make a -15C ice to 55C water but i don't know how to find how long it takes. How long will it take to reach 55C? Homework Equations The Attempt at a Solution Not even sure where to begin

Homework Statement A rigid cylinder contains helium (molar mass 4kg/kmol) at a pressure of 5 bar and a temperature of 15 oC. The cylinder is now connected to a large source of helium at 10 bar and 15 oC, and the valve connecting the cylinder is closed when the cylinder pressure has risen to...

Can somebody please give me a heads up on if I solved these two problems correctly, I appreciate it, thank you! d) In setting up a new department, a corporation executive must select a manager from among 4 applicant, 3 clerks from among 9 applicants, and 2 secretaries from among 7 applicants...

Homework Statement Find f(t) for the function F(s)=(10s^2+85s+95)/(s^2+6s+5) and apply the initial and final value theorems to each transform pair Homework Equations Initial value theorem: f(0)=lim s->∞ s(F(s)) Final value theorem: f(∞) = lim s->0 s(F(s)) The Attempt at a Solution...

Homework Statement Find f(t) for the function F(s)=(10s^2+85s+95)/(s^2+6s+5) and apply the initial and final value theorems to each transform pairHomework Equations Initial value theorem: f(0)=lim s->∞ s(F(s)) Final value theorem: f(∞) = lim s->0 s(F(s))The Attempt at a Solution After dividing...

Homework Statement A cart, starting at rest, is below a hopper at t=0. The hopper drops coal into the cart at a constant rate μ. At t=0 a constant force starts pushing the cart to the right and the coal begins to fall. The force ends once the back of the cart passes the hopper. A) Find...

Homework Statement A 1.00 mol sample of an ideal diatomic gas, originally at 1 atm and 20°C, expands adiabatically to 2.0 times its initial volume. (Assume no molecular vibration.) What is the final pressure for the gas?What is the final temperature for the gas? (it should be near -40 Celcius)...

When doing photoelectron spectroscopy, you excite a system containing of n electrons using photons to a system that contains n-1 electrons + the photoelectron. As I know, the information that you get out of the electron being measured from the electron analyzer does not contain the exact...

Homework Statement (Diagram of problem is given in attachment) m2 is stationary The coefficient of kinetic friction on m2 is 0.2 while the ground below m2 has a coefficient of friction of 0. a) Find the final velocity of both objects if m1 moves at the same v as m2 b)Find the minimum length...

Grade 11 Physics Final Project. Help! (Kinematics) first of all, I am new to the forum. and i was wondering if i should post this on homework forum or general physics. then i decided to post it here. so i have been working on a final project for my grade 11 physics. the teacher wants us...

Homework Statement A uniform solid sphere of mass M and radius R has a light, thin metal spike driven through it, so it is free to turn about this spike. So imagine a bowling ball on a stick that is free to rotate about this stick. A bullet of mass m is fired at speed v into the ball at a...

A steel ball is launched at 25 degrees above horizontal from the top of a platform that is 15 meters above ground. If the initial speed is 10m/sec, what is the final speed when it strikes the ground?

Hi all, I just want to see if my work is correct because it's not matching the answer in the book: A tank has a volume of 0.1 m^3 and is filled with He gas at a pressure of 5x10^6 Pa. A second tank has a volume of 0.15 m^3 and is filled with He gas at a pressure of 6x10^6 Pa. A valve...

Homework Statement Assuming the Earth is at rest and alone in the universe what speed would a spaceship arriving at the surface of Earth from an infinitley large distance be if the speed at infinity= 0 and acceleration is caused only by gravity Homework Equations F= \frac{GmM}{x^2}...

Homework Statement During an ice show, a 60.0 kg skater leaps into the air and is caught by an intially stationary 75.0 kg skater. Homework Equations What is their final velocity assuming negligible friction and that the 60.0 kg skater's original horiziontal velocity is 4.00 m/s? How...

Before the collision, there are two masses. Mass 1 is at rest and mass 2 is moving. No friction. It is an elastic collision and mass 2 is moving in positive x direction. After the collision, is it correct that mass 1 moves in positive x direction but mass 2 rebounds and moves in negative x...

1. The plates of a parallel plate capacitor are separated by a distance (4cm). A point charge of magnitude (q=2e) (3.2*10^-19 C) is fired horizontally through a small hole in the positive plate of the capacitor. The charge is fired with speed (8.5 *10^5 m/s) and, upon reaching point M (located @...

1. A frying pan, weighing 2kg (heat capacity = 490 J/kg/K) and at a temperature of 70C is plunged into a bowl containing 4kg of water (heat capacity = 4200) at 20C. Assuming the bowl has negligible heat capacity and assuming that there is no heat flow to or from the surroundings, what is the...

Homework Statement A nearly flat bicycle tire becomes noticeably warmer after it has been pumped up. Approximate this process as a reversible adiabatic compression. Assume the initial pressure and temperature of the air before it is put in the tire to be Pi = 1.00 bar and Tf 287K . The final...

1. Homework Statement Given: A sealed, rigid container (cannot change shape or size) containing steam at the shown conditions has heat added until it reaches the final shown state. Determine: a) heat added, b) work performed, c) change in internal energy of the system, and d) final system...

Homework Statement Given: A sealed, rigid container (cannot change shape or size) containing steam at the shown conditions has heat added until it reaches the final shown state. Determine: a) heat added, b) work performed, c) change in internal energy of the system, and d) final system...

Homework Statement Compound A mass - 11.0g solubility in ethanol at 78 deg C - 0.53 g/mL solubility in ethanol at 0 deg C - 0.08 g/mL Impurity B mass - 2.5 g solubility in ethanol at 78 deg C - 0.82 g/mL solubility in ethanol at 0 deg C - 0.12 g/mL Impurity C mass - 2.5 g solubility in...

Problem: The temperature of a piece of lead is increased from 20C to 35C while its volume is held constant by increasing the hydrostatic pressure. If the initial pressure is 1atm, what is the final pressure? Honestly, I'm not sure where to begin here. Everything we have done thus far has...

How do you calculate both final velocities in an elastic collision (assuming all momentum is conserved). For example, if a 1000kg car going at 20m/s rammed into a 800kg car going at 30m/s opposite direction, what would both their final velocities be? In my year 11 physics course, we only...

Homework Statement A man shoots an arrow 145m/s at 61o from a height of 15m where the ground below is the origin. A.) Where will the arrow be in 1.5 seconds (X,Y)? B.) What will be the displacement when the arrow lands in regards to where it was shot from Homework Equations I...

Question: An aircraft of total mass 1.5 x 10^5kg accelerates at maximum thrust, from rest along a runway for 25s reaching the required take off speed of 65 ms^-1. Assume that the acceleration of the aircraft is constant. Calculate the distance traveled in this time. My attempt: I...

Homework Statement A particle ( m = 1 kg ) moves on the x axis. The initial position is x = 0 and the initial velocity is v(0) = 5 m/s. The particle experiences a force, F(v,t) = − βv^2 e^(−αt) (a) Determine the final velocity of the particle. (b) Determine the distance it has moved at t...

Hi everyone! So I'm about to enter my 4th year in an honors physics program (in Canada if that matters) and my biggest concern is that I don't know what to do with my life after, what field to get into, etc.. things like that. and honestly I'm not even sure if I like physics anymore :(! I do...

Hi, I was wondering if someone could check to see if this problem is correct. For part "e" I originally was dividing put changed to multiplying is that correct? Thanks in advance for the help. A researcher was interested in the type of coffee that coffee drinkers prefer. A random sample of...

[b]1. An electron in the cathode ray tube of a television set enters a region where it accelerates uniformly from a speed of 62300 m/s to a speed of 3.86 × 106 m/s in a distance of 3.17 cm. What is its acceleration? [b]2. a = [Vf2 - Vi2] / [2d] [b]3. a = [(3.86 × 106)m/s2 - 62300m/s2]...

Hi everybody I got this from a book A stone is dropped from a height of 50 m and it falls freely. Calculate the velocity of the stone when it reaches the ground. Assuming g = - 9.8 ms2 ,negative as its going downwards . Using v2 = u2 + 2a(x - x0) v2 = 02 + 2(-9.8)(-50-0) I got...

Homework Statement How do I calculate the following. The final temperature of a mixture of of ice and water. Where 176grams of ice at -10celsius mixes with 206 grams of water at 73.3celsius. I have tried this equation in multiple fashions and cannot seems to come to a consistent answer! Any...

Hello, How do I calculate the following. The final temperature of a mixture of of ice and water. Where 176grams of ice at -10celsius mixes with 206 grams of water at 73.3celsius. I have tried this equation in multiple fashions and cannot seems to come to a consistent answer! Any help would be...

Homework Statement A projectile is fired through the air. It is launched from the ground, and travels without interference from wind or air resistance, landing on a raised platform above the field. Initial speed vs. final speed: Initial vertical velocity vs. final vertical velocity...

30g of ice at -15 degree celcius is added to 100g of water at 25 degree celcius. What is the final temperature? T1=ice T2=H2O at equilibrium must have m1c1(Te-T1)+m1k=m2c2(T2-Te) [k=3.3x10^5 J/K fusion heat coeff.] then Te=(m1c1T1+m2c2T2-m1k)/(m1c1+m2c2) T1=268 k T2=298 K...

Hi, here is an example of a concentration cell http://www.jce.divched.org/jcedlib/qbank/collection/conceptests/echem.html 1/ The final state is assumed when concentrations are equal in each compartment, right? 2/ Graphic evolution of the voltage is a decreasing curve, right?