Hard Definition and 1000 Threads

This problem sounds like a homework problem but its not and it is really hard. Consider a rail tank wagon filled with liquid, say water. Suppose that at some moment t=0 there opens a nozzle at left side of the tank at the bottom. The water jet from the nozzle is directed vertikally down...

Please help. I need this answered by tomorrow morning. The question is: Compute the average temperature over the Earth's surface given the fact that the Earth is a sphere with radius a=p. The temperature model is given by the linear transformation T=2(deg)+85sin(φ), with a 90deg rotation...

I'm having a hard time visualising how the units of torque are measured. I can picture how quick m/s or RPM is. But when it comes to torque, I cannot picture what 'x' amount of N/m does. Example, for a motor with 3.3 Lb-Inch or 7N/cm. Does it move 3.3lb of weight per inch? Does that mean...

I often hear people talk about string theory being the hardest branch of theoretical physics, and require a PhD to even understand the basics. I've even heard of people saying it's getting too hard for humans, much like quantum mechanics is too hard for cats. So to put things into perspective...

So I'm struggling trying to grasp the concept of momentum..due to my physics teacher going WAAAAAAAY too fast && i asked for help he didn't help much at all :\..so i asked my previous physics teacher i had before transferring classes because the school " said so " but it was a bit still...

I turned on my computer this morning and it said my computer couldn't start and it began a startup repair thing. The startup repair thing didn't find any problems and it shut down my computer. I turned my computer back on and it started up normally. Is this an indication my hard drive is...

Homework Statement see attached :) Homework Equations The Attempt at a Solution Not sure how to start..! Any hints? Thanks!

Word problem Derivative of Distance formula... Super hard. Please help. Homework Statement A point P is moving along the cruve whose equation is y=√x. Suppose that x is increasing at the rate of 40 units/s when x=3. How fast is the distance between p and the point (2,0) changing\ at that...

Homework Statement the easier one Atwood's Machine. The masses are M and 2M, and the pulley is a uniform disk of mass M and radius R. the string is massless and does not slip with respect to the pulley. Find the acceleration of the masses. Use force and Torque. answer should be something...

"Fake hard" aggrevation, and an appeal for advice. I love math. And logic. And modeling things. Outside of class, I even love physics. Inside of class, I feel like someone playing Street Fighter for the first time against someone who has owned the game for a year. Every time I get a...

Once i finish my undergrad in Australia, how hard would it be to take the masters course at cambridge, the mathematics part 3 tripos? Furthermore, how hard would it be to graduate with distinction? This is of course assuming i am good enough at math and physics to graduate first at my...

Draw a picture showing four identical shapes where each shape has at least one border with the other three. Your picture should be a single two-dimensional shape containing no gaps or holes. Tried many shape combinations irregular and regular. We got given a hint of not to think or draw...

What is Energy? - Hard energy definitions Explain this definition: energy is the ability to impart vis viva (mv2) Is it a well definition? Here's a more complex definition: energy is that measure of the physical change of a system that is conserved as a result of temporal displacement...

pls give me the detail notes for what is Hard water and softwater, Method to remove of Hardness,,,,,,,Hlep me

Homework Statement A pool in the shape of a rectangle is ten (10) m wide and twenty five (25) m long. The depth of the pool water x meters from the shallow part/end of the pool is 1 + (x^2)/175 meters. Write a definite integral that yields the volume of water in the rectangular pool...

I am planning to take my first grad course next semester in statistics (analysis of variance) and am debating if I should take grad combinatorial optimization as well. I handled 4 upper div. courses this semester pretty well (ODE, real analysis, probability theory, advanced linear algebra) but...

Homework Statement Two plane disks, each of radius 5cm, are mounted coaxially with their adjacent surfaces 1mm apart. They are in a chamber containing gas at STP (viscostiy of gas = 2.1 x 10^-5 Ns/m^2) and are free to rotate about the common acis. One of them rotates with angular velocity of...

Homework Statement Suppose that each day I either catch the bus to work or drive my car to work. Suppose that the probability I catch the bus on any particular day only depends on the mode of transport I used on the previous day, and is 0.7 if I caught the bus on the previous day and 0.25...

QUESTION HAS BEEN SOLVED ! :) THANKS MARK![/color] Homework Statement Shark Inc. has determined that demand for its newest netbook model is given by https://webwork.elearning.ubc.ca/webwork2_files/tmp/equations/80/fa9842dd3479ee1baaab655e02a1c41.png, where q is the number of netbooks Shark...

Homework Statement A person drives a car (without negative lift) over the top of a hill, the corss section of which can be approximated by a circle of radius 250m. What is the greatest speed at which he can drive without the car leaving the road at the top of the hill? Homework Equations...

[PLAIN]http://img811.imageshack.us/img811/4882/stumped.png So from the above question I presume that the relation (Density)x(Area1)x(Velocity1)=(Density)x(Area2)x(Velocity2), cannot be applied due to the flow being unsteady and thus the control volume changing with time. I've read up about...

Homework Statement a) given, a + 5 and 2a-1, one is 40% greater than the other one, solve for a. b) given, 5x^{4} + 4x^{3} + 3x^{2} + Px + Q. When divided by x^{2} - 1, you get a remainder of 0, solve for p and q. c) given csc(6b + \frac{pi}{8}) = sec(2b - \frac{pi}{8}), solve for b...

1. Suppose a piece of solid bismuth weighing 27.7 g at a temperature of 253 °C is placed in 277 g of liquid bismuth at a temperature of 333 °C. Calculate the temperature after thermal equilibrium is reached, assuming no heat loss to the surroundings. The enthalpy of fusion of solid bismuth is...

integrate zdz/sqrt{z^3-1} I have been doing it for 1week. please help me

1 hard(?!) Biology Question!HELP! :/ Homework Statement If life had been "intelligently" design, and if an important design principle is conservation of material and efficiency of process, we would not expect DNA replication to involve the crazy, complex, intricate, Byzantine mechanism for...

I am a high school senior having a problem with a problem in my thermochem class. Could someone please help me understand the following: if 16.8 kJ are released when 1.20 g of F sub 2 (F2) reacts with SiHsub4 (SiH4), what is the heat of reaction when 1.90 moles of Fsub2 react?

Homework Statement A horizontal slingshot consists of two light, identical springs (with spring constants of 57 N/m) and a light cup that holds a 1-kg stone. Each spring has an equilibrium length l0 = 47 cm. When the springs are in equilibrium, they line up vertically. Suppose that the cup...

I post it in the image

[PLAIN]http://img839.imageshack.us/img839/2670/hardlimitproblem.jpg I am having trouble showing this. I figured I would divide both sides by a, and show that lim n-> infinity [(a1/a)*b1+...+(an-1/a)*bn-1+(an/a)*bn]/(b1+...+bn) = 1. I can explain in words why I believe this to be true; as n...

I am not sure where to post this thread but i guess here. So not to brag but I have gotten straight A's most of my entire life, I found school pretty easy aside from some spots (like Spanish). My GPA is very high and I am ranked in the top 2 percent of my class. So once I completed spanish 3 i...

12 persons sit around a round table for a game. 1st person gives the ball in his hands to the person in either his left or right randomly. in the same token the person who holds the ball gives it the person in either his left or right randomly. game continues so until the last person holds...

Well I am doing my homework and there are a few problems that are so hard that i can't even try to get an answer... Hoping you can give me tips to get started, Here they are: 1) A world-class sprinter accelerates to his maximum speed in 3.9 s. He then maintains this speed for the remainder...

Homework Statement if {An} converges and lim {An}=L L\neq 0 and {Bn} diverges then does {An X Nn} diverge? prove formally Homework Equations The Attempt at a Solution can anyone give me a hint or show a solution?

I am a freshmen who is interested in studying physics, but I did not take the first semester physics with my Calc 1 this semester. My plan is to take Physics 1 next semester and Physics 2 over the summer semester. The summer semester is longer then a normal one because it is about three months...

1. Suppose P([1/n,1/2])<= 1/3 for all n = 1,2,3,... a) Must we have P((0,1/2]) <= 1/3 ? b) Must we have P([0,1/2]) <= 1/3 ? My answer - Please correct me if i am wrong a) P([1/n,1/2])<= 1/3 for all n = 1,2,3,... lim P([0,1/2]) n-> infinity so then P((0,1/2]) is a...

Hello .. I'm currently trying to choose my degree course and I'm having difficulty in knowing what to do. I know this will sound stupid but I'm terrified of taking IT and/or Science in University and failing in it. Technology in particular because Maths is hard to me and many if not all IT...

At my university, it's a junior-level class, and mine is being taught by the physics associate chair. It's very fast-paced, and he told us the first day of class he would give us the hardest homework problems in the book. Well, he does. Aside from this site and finding solutions online to help...

Homework Statement I've been struggling for the past hours and can't find the difference between "linear system of algebric equation " and "homogenus system of equation" ,I have the oral(writting) exam tuesday and I would appreciate a little help since I passed writting exam and only final...

A ball is thrown upward... hard question?? Homework Statement A ball is thrown up from 64 feet above the ground with an initial velocity equal to 128 feet per second. Find when and with what speed the ball hits the ground. The Attempt at a Solution v = 128 anti derivative of velocity...

Hard problem - dividing the subs ! Homework Statement Anupam brought n > 0 subs, one each of length 1; 2; 3;... ; n, to a grading party. The three TAs distributed the subs among themselves such that no sub was broken, and each TA ended up with an equal total length. For what values of n...

The problem is with energy of electromagnetic field -\frac{d}{dt}\int_V\frac{1}{2}(\vec{E}\cdot\hat{\epsilon}\vec{E}+\vec{B}\hat{\mu^{-1}}\vec{B})dV=\oint(\vec{E}\times\vec{H})\cdot d\vec{S}+\int_V\vec{j}\cdot\vec{E}dV I have this relation \hat{\epsilon}, \hat{\mu}^{-1} are symmetric tensors...

... to becoming a professor. I was looking around and saw how difficult many people say it is to become a uni professor so I am going to skip that question "How Hard is it?!?" but let me just make sure if i have this right Undergraduate(Bachelors) Graduate (masters) PhD. Postdoctorate...

Homework Statement To save fuel, some truck drivers try to maintain a constant speed when possible. A truck traveling at 91.0 km/hr approaches a car stopped at the red light. When the truck is 115.7 meters from the car the light turns green and the car immediately begins to accelerate at...

Problem solved :)

Homework Statement Diagram from picture attached R= 200 + 50sin (2pi nt), n=2 R= 200+ 50sin(4pi*t) mm ThetaDot = 120 rev/minute = 12.566 rad/s Gamma(Y) = 30 degrees Calculate acceleration when velocity is max Homework Equations ar= rDotdot - r*(thetaDot)^2 aTheta=...

Homework Statement Factor completely (cis(x) - cis(-x) )/(2i) + (1 - cis^2(-x))/(i + i cis^2(-x) ) Yes I know that it's just simply sin(x) + tan(x) which equals sin(x) ( 1 + sec(x) ) but however if you write it out in it's proper form (cis(x) - cis(-x) )/(2i) + (1 - cis^2(-x))/(i +...

Does anyone know the stances of prominent physicists (Susskind, Hawking, others) on hard determinsm?

Background: BS physics, double minors in chem and math, c/o 2008. Started with chem major, but switched to physics for interest/challange. No absolute career goals, but always considered bigpharma as a good place to go. Considered physics grad school, but never that interested in teaching...

when i started learning in the faculty i thought that if i would solve every housework every class work understanding the laws explained in the lecture. then i would get a high grade. but it was not the case. many times i heard in the end of the course sometimes by the professor himself...

Hey folks, another question. What is the difference between hard and semi-hard scattering events? In terms of energy I found for both s >> t, so where does the difference lie? Thanks, Earth's