Lost Definition and 576 Threads

Homework Statement Solve the differential equation R\frac{dq}{dt} + \frac{q}{C} = v_0 R is resistance, q is charge, t is time, C is capacitance, and v_0 is the EMF of the power supply.Homework Equations First-order linear differential equation solving method The Attempt at a Solution This is a...

energy lost by speeding car while drinving on a soft surface how much more energy does a car need to continue driving at a constant speed if it sinks 1cm into a soft material. car weight 1000kg car speed 30mph friction is neglected

Heat question!??the amount of heat gained or lost by a substance is equal to Homework Statement the amount of heat gained or lost by a substance is equal to the product of its______ times the change in__________ times its__________ Homework Equations none that i know of The Attempt...

Homework Statement A 40.8 g ball of clay hits and sticks to a 3.41 kg block sitting at rest on a frictionless surface. What is the speed of the block after the collision if the initial speed of the ball of clay is 5.04 m/s? b)What percentage of the system's initial energy is lost...

Homework Statement Calculate the magnitude of the bending moment and shear forces at the centre of the beam shown in the attached figure Homework Equations The Attempt at a Solution For the shear forces I think its the sum of the vertical components, Bending moment = not...

Homework Statement A small piece of aluminum(atomic number 13) contains 1015 . (The atomic number is the number of protons; it determines the (positive) electric charge of the nucleus and, thus, the number of electrons in a neutral atom.) If the piece of aluminum has a net positive charge of...

Suppose the length of a pole is a random variable X, with mean m(x) and probability density function f(x). Poles are cut to obtain an exact length L. If the initial length of the pole is less than L, the entire pole is lost. If it is greater than L, the pole with be cut down to L, and the...

1. The diagram above shows the lowest four descrete energy levels of an atom. An electron in the n=4 state makes a transition to the n=2 state, emitting a photon of wavelength 121.9 nm (a)Calculate the energy level of the n=4 state. (b)Calbulate the momentum of the photon. The photon is then...

Homework Statement Okay, here it is: The wavefunction is psi=1*[1/sqrt(6)]*psi_1 + 2*psi_2 and I have to find the total probability (yes, there is a "weight" of 2 in front of the second part of the wavefunction). Homework Equations I know that psi^2 gives the probability, but I don't...

Homework Statement A search light is being used at the edge of a tank to find a lost key at the bottom of the tank. The tank is filled to the top with a fluid for which the index of refraction is 1.68. The key is 8.176 m below the surface and 6.84 m from the edge of the tank. At what angle...

Energy "lost" in rolling, sliding and torsion Hey everybody, I have a question concerning three states and the state of energy in them. 1. Rolling 2. Sliding 3. Torsion For example: If I have a steel cylinder with diameter d on an axis (no friction in the axis) rolling horizontally over a...

1. I am investigating how the initial height a ball is dropped from affects the rebound height. We have been asked to make a prediction about what we think will happen; however, we have not been given any guidance as to what we should write. Homework Equations To find the % potential...

Has charge (magnitude) [edit] lost some of its value since the time of the big bang? If so, what's the theory behind this?

hi how r u? may be i don't know u but i know that ur feelings r so much close to me. ok i am RAJ KUMAR, I have one MSDOS games CD in 1999, that contains many MSDOS games including EA sports cricket 96. Its volume label is terminator. I have wandered all over the place & yet to find a solution...

Homework Statement The coefficient of the restitution of an object is defined as the ratio of its outgoing to incoming speed when the object collides with a rigid surface. For an object with a coefficient of 0.59, what fraction of the object's kinetic energy is lost during a single...

[b]1.Sand from a stationary hopper falls on a mov- ing conveyor belt at the rate of 4 kg/s, as shown in the figure. The belt is supported by frictionless rollers and moves at 1.07 m/s un- der the action of a horizontal external force supplied by the motor that drives the belt. Find the...

Would it begin to spiral into the sun or would it slip into a new orbit? Don't most meteorite impacts occur due to the Earth sweeping into the meteor like a car hitting bugs? Wouldn't each and every impact slow the Earth down a tiny bit while also adding to the mass of the planet? I...

I'm not going to blame anyone except for the fact that I'm probably a slow learner. Can somebody explain some of the things I'm learning in layman terms? That way I can have some context when I'm reading about them. Right now, the things I'm reading have no meaning, so it's really hard to...

Homework Statement A mass 0.40 kg is released and slides down the incline. The maximum velocity ( taken the instant before the mass reaches the bottom of the incline ) is 1.00 m/s. What is the kinetic energy at that time? What percentage of the potential energy of the system is not converted...

0.100 mol/L + 23 ml of Potassium Hydroxide is mixed with 18 ml of hydrobromic acid. Calculate the heat gained or lost by the reaction. The initial temperature was 20.1 celcius and the final was 24.5 celcius. i have no clue how to solve this equation. Can someone give me clues and what...

Homework Statement How much work is needed for a 71 kg runner to accelerate from rest to 10.2 m/s? I have no idea how to do this so I have no equations or attmpts at this.

The "LOST" drinking game I was watching LOST last night and something occurred that happens quite regularly on the show, and it got me thinking about drinking games. So I started a list of rules for a LOST drinking game. If anything on the following list happens while watching LOST, you...

ok. i am taking an "INTRODUCTION" physics class. I have never taken physics in my life before. the requirements for this class are high school algebra with a C or better (which i got) and the guy throws story problems at us and doesn't explain how to solve them or the formulas. is this...

Intersecting triangles. Homework Statement Find x http://img177.imageshack.us/img177/3043/trighj0.png Homework Equations trig and inverse trig functions? The Attempt at a Solution I have no idea how to solve this. When I try and use the trig that I know to find the lengths, I...

Homework Statement Solve algebraically for T2 then find T2. T1C=63 Celsius T1H=79.5 Celsius MCW=8.63g MBW=36.48g Homework Equations QLost = QGained -mbwcw(T2-T1H) = mcwcw(T2-T1C) The Attempt at a Solution Trying to solve algebraically I arrived at: T2 =...

Hi, I'm currently in my final year doing an Materials Science and Eng. BSc at IPTME (Loughborough University, UK). Although I've been approched by some companies, I'm not entirely sure what line of work I'd be doing. If there are any materials engineers out there I'd be interested to know what...

I was looking at Kelly Johnsons flight log photos online: I've also noticed professor Anderson (of the Anderson Aeroynamic Book series), also has amazing Penmanship. So does my grandmother. Pretty much all the old timmers do. Meanwhile, I scribble mess unless I'm turning in...

Homework Statement Would the Mg : O ratio be affected if some magnesium oxide smoke escaped during the reaction of Mg with oxygen gas? Please explain with a sample calculation. Thanks.Homework Equations I know that the empirical formula is MgO.The Attempt at a Solution I don't understand how...

About two years ago I started to love Physics, it was inspired by many things, but mainly the book Contact by Carl Sagan. I began lurking on this website - reading posts, reading books and expressing the odd childish theory as well :smile: I then chose my A-levels. I chose Maths, Further Maths...

Hey guy, I have a slight problem. I lost my gre score sheet. If anyone could tell me what percentage a 4.5 on the writing section is that would be great. I think it is a 48%, but I am not sure. Thank you

Really need your help peoples... Built my own computer a couple years ago and the new case came with a cheap Power Supply Unit that recently began failing. While booting, the power connection fails and everything shuts off and I have to wiggle the power cord plug and try again. No...its...

Hi, I know that energy is neither created nor lost based on everyday observation but how about E=mc^2 when mass converts to energy. Do physicist consider that as energy created because mass is loss while it creates a huge amount of energy.

This article just showed up today about the blonde haired, white skinned nation of people called the Cloud People or Chachapoyas. The site is reported to be about 4.2 hectares in size. What drew the people that found the site to it was the sound of an enormous waterfall they found to be 500...

a cart with a mass of M is moving at velocity V, a body with a mass of m falls onto the cart from a height of H and sticks to it, how much energy was lost (to heat), there is no friction. i said that, since the mass freefalls, its velocity at the moment of impact is\sqrt{2gh} the momentum...

Has my lecturer lost the plot!? He keeps giving us PDEs to solve where the initial conditions specify x at a POINT rather than along a curve e.g. solve yzx+xzy+z=y given z=2 @ (3,1) should he not be saying z@ x = ... OR z @ y = ... thanks

From Slashdot Visit the article on http://spaceweather.com/archive.php?view=1&day=23&month=11&year=2008 to track when it will be overhead near you.

PLEEASE HELP! I AM LOST! Thank you. I have two questions: 1. Electromagnetic waves also can form standing waves. In a standing wave pattern formed from microwaves, the distance between a node and an adjacent antinode is 0.44 cm. What is the microwave frequency. I keep getting the wrong...

A 78g particle moving with an initial speed of 39m/s in the positive x direction strikes and sticks to a 160g particle moving with 33m/s in the positive y direction. How much kinetic energy is lost in this collision? Answer in units of J. Can someone please tell me how to solve this...

Need help for Final Physics Exam. Gen Physics 1? I was given a bunch of problems from out of my book. I've cruised through most but chapter 8 is giving me a real hard time. Here are some examples from the chapter, any help with these type problems would be great. 1. Block A has mass 1.00kg...

Homework Statement part -1) A 30-06 caliber hunting rifle fires a bullet of mass 0.0113 kg with a velocity of 765 m/s to the right. The rifle has mass of 4.1 kg. what is the recoil speed of the rifle as the bullet leaves the rifle? answer in...

Stock market - no connection company/share - money isn't lost?!? I've spoken to some hobby stock market "users" but none of them could convincingly explain the basic share system without ending up in circular arguments. 1) My impression is that there is no logical connection at all between...

Recently I've been calculating that if there was a satellite in orbit around the Earth, to make it move in a cicular path, we'd have to hit it so that it acquires a speed of \sqrt{\frac{GM}{r}}. (You can check this out : https://www.physicsforums.com/showthread.php?t=266719). Everything was OK...

Homework Statement A computer disk is turned on starting from rest and has constant anglular acceleration. If it took 0.570s for the drive to make its second complete revolution, how long did it take to make the first complete revolution? Also what is its angular acceleration Homework...

Connect a resistor across a capacitor(which has its own energy) to discharge it. After the capacitor is fully discharged, we know that there is not any energy left on the capacitor. So, where does the energy of the capacitor go? I think, not all of the energy goes to heat, so what are the other...

Homework Statement You are lost in the campus of MIT, where the population is entirely composed of brilliant students and absent-minded professors. The students comprise two-thirds of the population, and anyone student gives a correct answer to a request for directions with probability...

In organic lab this week we were mixing (1-R, 2-S) ephedrine with mandelic acid to get crystals. I dissolved both compounds in 6 mL 95% EtOH and then poured them together. After cooling + glass prodding I should have had no trouble getting crystals. HOWEVER, during the cooling I accidently...

Possible bound states of a one-dimensional square well... I'm Lost! Homework Statement Find the solutions of even and odd parity from the transcendental equations then find the number of bound states that are possible for a potential such that p(max) = 4? Homework Equations p=ka/2 &...

sooo lost... please help! (probablility? problem) So, we were given simulations of histograms that has to do with rolling a certain number of dice consecutive times. and these questions were given... and I am soo lost as to how to approach these questions. 1. What is a reasonable numerical...

Homework Statement During exercise a person may give off 180.0 kcal of heat in 30.0 minutes by evaporation of water from the skin. How much water has been lost? The latent heat of evaporation of water is 539 kcal/kg. [b]2. I believe the formula to use is Q=MxLv [b]3. I started...

Homework Statement An object is out in free space, in motion along a straight line, with a constant acceleration of 15 m/s2. At time t = 0, the object is at x = 0 meters, with a velocity of -80 m/s. Where is the object at t = 10s ? a. - 50 m b. 20 m c. - 4 m d. 75 m...