Final Definition and 1000 Threads

Homework Statement If a ball is dropped down a ramp of any shape, will the acceleration always be 9.8 assuming there is no friction. Homework Equations I know you can use mgh = 1/2mv^2 to solve for velocity, but can you use vf^2 = vi^2 + 2(a)(d) The Attempt at a Solution If you use both...

Homework Statement As simple as the question may seem, I require some honest help. I'm particularly new to physics. The question is the following: A net force of magnitude 4.0N acts on a body of mass 3.0kg for 6.0 s. The body is initially at rest. Which of the following is the speed of the...

Homework Statement An object is acted on by the force shown in the picture shown below: What is the final position of the object if its initial position is x = 0.50 m and the work done on it is equal to -0.29 J? Initial position = Xi = 0.5 m Work = W = -0.29 J Force = F displacement = d...

Please please urgent help needed with questions like these How do I predict how big the sample needs to be?

Hi everyone, I haven't been successful in Discrete Math this semester. I have finished all of the calculus I-III series and I did very well. I want to know if anyone can give me some tips on how to study for my final coming up in a few days. Now, I understand that is a vague question but I am...

Hello! I'm new here and I really need help from you guys. I'm an engineering student and need to do project proposal for my final year project. We have 6 month to do the proposal and I cannot think of any idea. I have experience in using -Lathe -CNC Turning and Milling -Milling machine -Drilling...

Our faculty got this in their e-mail today:

Homework Statement a cart, with a mass of 1 kg, on an air track is pushed from rest, for a certain length in time (5 seconds) until it reaches a speed of 3 m/s what speed will a cart of mass 2kg reach when pushed with the same force for the same time? Homework EquationsThe Attempt at a Solution

This is a modified problem from the one posted a few days ago. I’ve been unsuccessfully trying to solve it since then, so maybe it’s time to ask for some help. I’ve changed the quantities :) 1. Homework Statement The mass of puck 1 is ##0.2\ kg## and that of puck 2 is ##0.25\ kg##. The...

Homework Statement It's a simple problem, you kick a ball with an initial velocity of 5.4 m/s, the angle is 30 degrees. So the question is when does it land on the ground? So I thought that I could find final velocity so that I can use V = V(initial) + acceleration * time. My question is, can...

Homework Statement If the flue gases exiting the boiler are used to preheat the water fed to the boiler from a temperature of 28 C to 90 C and assuming: • a mean specific heat capacity for water over this temperature range to be 4.2 kJ kg–1 K–1 a mean molar heat capacity for the flue...

And if not, what do you believe?

Homework Statement A Rail car with a mass= 27000kg's moving at 4m/s collides with another rail car with mass 80,000kg that was moving towards the first. After the collision, both cars come to a complete stop, what was the initial speed of the second rail car? Homework Equations...

Homework Statement Stacy is throwing a discus. During the throw, she applies an average torque of 90Nm to the discus for 0.3 seconds. The discus has a mass of 1.0kg, and has a radius of gyration of 0.1m about its spin axis. If the initial angular velocity of the discus was zero, what was the...

I am wondering whether graduate schools really care about final semester course load. I am a senior physics major, applying to graduate schools in geophysics. Currently I am enrolled in the normal 16hr course load but am considering dropping down to 12 hours for my final semester. I've never...

Homework Statement (c11p34) You pour 160.0 g of hot coffee at 75.0 oC into a 230.0- g glass cup at 24.0 oC. If they come to thermal equilibrium quickly, what is the final temperature (in oC, enter deg in asnwer box)? Assume no heat is lost to the surroundings. Homework Equations (I don't even...

Homework Statement Mass 1 (2.77 kg) moves with an initial velocity (1i - 1j) and mass 2 (1 kg) starts at rest. After the collision, M2 moves with a velocity of (2i - 3j). What is the final velocity of m1?Homework Equations Since they don't stick together, KE and linear momentum are conserved...

Homework Statement a ideal monoatomic gas initally has a temperature of 315K and a pressure of 6.87atm . It then expands from a volume of 440cm^3 to volume 1550cm^3 . If the expansion is isothermal, what is (A) the final pressure (in atm's) and (B) the work done by he gas. Homework Equations...

I am not good at typing out formulas and equations on the internet, so I took pictures of what I did instead. I hope that's not too informal. 1. Homework Statement A rock is tossed straight up with a velocity of 19 m/s. When it returns it fell into a 10 m deep hole. Q: What is the rock's...

Homework Statement I'm trying to create a problem for my physics standards that is hard. I gave myself a ball being pushed down a carpeted decline at 24° from the horizontal. The balls starts with an initial velocity of 1 m/s and ends the 6 meter decline at 5 m/s. I want to find the applied...

Hello, I am really struggling with calculating the final rotation of a spinning wheel. I am not even sure if my equation for changing the velocity of the spinning wheel given a coefficient of friction is even correct so I will post it here... change in angular velocity = angular velocity *...

Homework Statement I'm taking grade 12 U physics and I'm having a really difficult time understanding the answers given compared to the answers I arrive at. For example: The question reads: A rock was thrown horizontally from a 25.0 m high cliff and landed 15.0 m from the base of the cliff...

A box containing 2 moles of rigid diatomic gas molecules at temperature T connected to another box containing 2 moles of ideal monoatomic gas at temperature 5T. What is the final temperature of the gas mixture,neglecting heat losses? 2. The attempt at a solution: Q(initial)=Q(final)...

Hello everyone, The following is continued research on a book my wife and I are writing. In said book our Heroine has enhanced speed and strength but during the final act of the book she is constrained to the limits of human strength. We have decided that she would be capable of the limits of...

Hi I'm about to start my 3rd year in my Engineering university and would like some ideas for my Final Year project... We have 2 options. We can either make a model/prototype of something and present it OR we can do a research on a particular field. I'm leaning more towards the research side...

Background This is for a video game, "Kerbal Space Program"... I'm sure some of you here have heard of it. It's the type of game you guys would be interested in. I have built a program to design rockets, but I'm not sure what the optimal thrust-to-weight ratio is. That is, how much fuel I...

Homework Statement You have a 10kg ball that is going 10m/s. It is about to collide with a much less massive ball that is stationary. What is the range of final velocities of the small mass? All Collisions Are Elastic Given Case 1: The large mass stops after the collision. Given Case 2: The...

Homework Statement Three thin lenses, each with a focal length of 40.0 cm, are aligned on a common axis; adjacent lenses are separated by 52.0 cm. Find the position of the image of a small object on the axis, 80.0 cm to the left of the first lens. Homework Equations 1/s + 1/s' = 1/f The...

I am an electronic and comm. engineering student, I have trouble in choosing my final year project topic. At first, I decided to build an passward/face recognition based Android app for wireless door lock/unlock system. However, this idea was banned by my supervisor because of lack of...

a high diver leaves the end of a 5.0 m high diving board and strikes the water 1.4 s later, 2.8m beyond the end of the board. Considering the diver as a particle, determine the following: a) her initial velocity & angle above horizontal. b) max height reached above water c) final velocity as...

Homework Statement a 28kg block starts at rest and slides down the incline ramp which is at an angle of 20 degrees up from the horizontal. the coefficient of kinetic friction between the incline and the block is 0.22. The height of the ramp is 2.5m. How much energy was lost to friction as the...

Hi I am about to start my 3rd year at my university while studying Automotive Engineering. As you all know, I need a final project to fully complete the 3rd year and I am having a bit of trouble choosing one. I was thinking of doing a research project instead of a practical project since I...

Homework Statement There is a point particle on the edge of a merry-go-round. It has mass 15kg and the merry-go-round has mass 235kg. The initial angular momentum is 2 radians per second. If the point particle moves from the outer edge of the merry-go round to the centre, what is the final...

Hi all, I am really curious about the final state conjecture in general relativity, but I don't really understand it... There seems to be a really good explanation provided by Willie Wong here: http://math.stackexchange.com/questions/50521/open-problems-in-general-relativity however it is...

Two objects, both of mass "m", start out, at rest, a distance "h" apart (the radius of both objects is negligable). What speed will one of the objects have when they collide? (relative to the original "resting" speed) The whole point (without going into why) is to solve the problem without...

Hi, I am looking to start preparing for my final year project in my Industrial Electronic and control engineering degree and I'm trying to figure out a good strong, realistic scope for my project. I'm a part time student already working within the automotive industry. I have one idea to...

Homework Statement I am given an equation for the acceleration of an object with respect to time a(t). I know that it will be accelerating over a certain distance d, after starting at rest. How do I find the final velocity that this object has reached after traveling the distance d...

Homework Statement A solid rubber wheel of radius R and mass M rotates with angular veloctiy \omega_0 about a frictionless pivot. A second rubber wheel of radius r and mass m, also mounted on a frictionless pivot, is brought into contact with it. What is the final angular velocity of the first...

Homework Statement Two masses m1 & m2 in free space are released from rest at a distance D and draw together under gravity to a distance d, calculate the final velocity of each mass. Homework Equations Final total KE of both bodies at d from : KE (t) = ( ( G * m1 * m2 ) / d ) -...

Homework Statement 2: Some proofs: a) If ##\{ v_1 , v_2...v_n \} ## are linearly independent in a real vector space, so are any subset of them. b) If any subset of vectors ##\{ v_1 , v_2...v_n \} ## in a real vector space are linearly dependent, then the whole set of vectors are linearly...

http://imgur.com/WPZWkJf The final voltage across the capacitor is the same as the source voltage is 90 V since a capacitor behaves as an open circuit in presence of a DC voltage. But what about the resistor? He is placed in series with the capacitor and wouldn't it be: final voltage...

When entropy is complete doing what it is doing is their an idea as to what is left i assume all the protons have decayed. What would the very last particle be and what would it decay into?

Hello all, I have a bit of a dilemma. I have two free electives to take and I am considering taking two "advanced" math classes and get a math minor or two semi-good classes from whatever. If I take two math classes and I get A's, it would be lovely. But, If I get low grades, my GPA will...

Homework Statement Here is the question I'm trying to answer: A tennis player hits a 1.45 kg tennis ball with a racket of mass 2.5 kg. If he hits the ball with a velocity of 7.5 m/s and then stops, what impulse did he imply on the ball? What is the ball’s velocity? Homework Equations...

For example: 17/30 for class assessment (worth 30% of final grade) 18/30 for assignment (worth 30% of final grade) How do you figure out how much you would need for the final exam (worth 40% of final grade) Thanks!

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...

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...