Hard Definition and 1000 Threads

Have a hard time grasping the concept of the Geodesic. If you are given a velocity and position of say a small astroid entering the gravitational field of the Earth. How do you find the trajectory or path it takes as it falls to Earth? Not afraid of tensors and advanced calculus.

I have resigned to make this the last in my series of question for the forums. I think it might end up being the most important one and hope others will find it useful. What are some tips, or pointers to resources for tackling a higher work load/ difficulty in classwork than you are used to...

HELP ! this problem is very very confusing T_T Three forces, each of which is perpendicular to the other two, act on an object. If the magnitudes of these forces are 6 N, 15 N, and 10 N, respectively, find the magnitude and direction of the resultant. (State the angles that the resultant...

Hard General Relativity question, help :(!? I cannot come up with a solution to the following, can some one please help me? I would greatly apprecieate it! Thank you! Question 1 The Kretschmann curvature scalar is defined to be K = R_abcdR^abcd where Rabcd is the Riemann tensor. Compute...

I have an external Western Digital 320gb hard drive that has never given me problems. However the only thing i can think of that has caused sudden problems for this external SATA drive is the bios flash that i recently updated. The drive is recognized in mycomputer, however it doesn't say how...

Homework Statement Alright, so I've given this guy a few cracks, and I think I'm close to it, but apparently I'm not right, so here's how it goes. Simple in concept. A meteor moves toward the solar system with speed v0 in a direction such that it would miss the sun by a distance d if it...

I am really stuck on this problem. This entire section I have been teaching myself using the homework answers but I have no idea where to start. Thanks anyone. Question: A beam of thermal neutrons emerges from a nuclear reactor and is incident on a crystal as shown below. The beam is Bragg...

Hey folks, I am thinking about maybe trying to do a physics major. However, I don't want it to be too hard and lower my already low gpa. How hard is the math and courses like upper division Moldern Physics, Mathematical Physics,Dynamics,Thermal Stat, E&M and QM? Also how hard are the require...

Homework Statement I have read the chapter twice and I have read through the notes several times to help me with the homework assignment. It deals with damped Harmonic Oscillations. Problem: You have a mass submerged horizontally in oil and a spring with a k of 85 N/m pulls on a mass of...

A uniform, 4.0-meter long beam weighing 1200 N is supported by a cable. The beam pivots at the bottom, and a 2100 N dead weight hangs from its top. Since the beam is not accelerating, you know that the net torque on it is zero. Find the tension in the cable, which is oriented at 25° from the...

Homework Statement A golf ball with an initial angle of 30° lands exactly 216 m down the range on a level course. Homework Equations x=vt+.5at2 The Attempt at a Solution

Homework Statement neither my professor nor my TA could figure this out. so they are offering fat extra credit for the following problem Let n be a positive integer greater than 1 and let p1,p2,...,pt be the primes not exceeding n. show that p1p2...pt<4n The Attempt at a Solution...

Homework Statement A computer hard disk starts from rest, then speeds up with an angular acceleration of 198 rad/s2 until it reaches its final angular speed of 7683 rpm. How many revolutions has the disk made 10.7 s after it starts up? Homework Equations t=wf/a delta0=wi*t+(1/2)(a)t^2...

I am stuck on an intergration and can't get a simple answer which i should get p = (2*m*l^2)^(1/2)*(E+m*g*l*cos theta)^(1/2) using small angle (need for question) cos theta = 1 - (theta^2 )/2 Then I intergrate from 0 to 2*Pi and get some very large eqn using a maths program, I can't...

Homework Statement A train traveling at a constant speed rounds a curve of radius 235 m. A chandelier suspended from the ceiling swings out to an angle of 17.5° throughout the turn. What is the speed of the train? Homework Equations a=v^2/r use of cosine and sine v=2x3.14xr/T The Attempt...

Rate of change problem...very hard...please help! Homework Statement The hands on a clock are of length 5 inches(minute hand) and 4 inches(hour hand). How fast is the distance between the tips of the hands changing at 3:00? The Attempt at a Solution Let the coordinates of the two hands...

You throw a ball toward a wall at speed 24.0 m/s and at angle θ0 = 43.0° above the horizontal (Fig. 4-35). The wall is distance d = 16.0 m from the release point of the ball. (a) How far above the release point does the ball hit the wall? What are the (b) horizontal and (c) vertical components...

I bought a book on C++ that was recommend by a friend and a cheap book on C and I just can't get into it. It start off ok, but then the throw 50 lines of code at you for even a basic program and I get lost... I don't know what any of it means and I feel like bashing my head in. Any...

Hi, folks, I need the proof of following inequality for a,t\in(0,1): Weaker form: \ln(1+t^a)\geq a\ln^a(1+t). Stronger form: \ln(1+t^a)\geq\frac{1+a}2\ln^a(1+t).

I'm planning to do a degree in physics (in the U.K) next year. Its just a normal physics course (e.g. not physics with nanoscience, or theoretical physics) and I want to know how hard people think it will be. I'm good at physics and I can grasp concepts quite well. I'm ok at maths, I understand...

Homework Statement What maximum power can be radiated by a 14cm -diameter solid lead sphere? Assume an emissivity of 1 Answer in two sig fig. Homework Equations ( Q / delta t) = e*σ*A*T^4 e=1 σ=5.67*10^-8 W/m^2*K^4 Stefan-Boltzmann constant (<--- who happens to be my great...

ANALYSIS --Really hard ..Please help me Are these TRue or FALSE I am trying to figure it out for 3 hours now and I am really stuck 1) For all x and all y, there exists a z such that x+y=z I know is True 2) For all x there exists a y such that for all z, x+y=z I think this is true...

Electric Field hard question :( Homework Statement What is the electric field between two parralel plats, each of area 1 m^2 which are separated by a distance of 0.01 m, if each plate is charged equally but oppositely with a charge of magnitude 8.84 x 10^-8 C? Homework Equations E= kQ/...

hard complex reasoning help! Homework Statement American advertising agency McKAnn decided to bungee jump a car off a bridge to show how well made the car was. They used a 30 m m rubber bungee cord used by the army to bungee tanks during air drops. it had nine individual cords each around...

Of the pictures I have seen with the Palin family brandishing guns, the majority show hard liquor being drunk or having been consumed. Even the NRA would not condone anyone handling weapons while intoxicated. What does this say about the mindset of someone seeking to be entrusted with the...

2D Kinematics Please Help! I tried so hard Relative to the ground, a car has a velocity of 17.3 m/s, directed due north. Relative to this car, a truck has a velocity of 20.5 m/s directed 48.5 ° south of east. Find the (a) magnitude and (b) direction of the truck's velocity relative to the...

I'm trying to prove or disprove the following: Let a_1, ..., a_n be natural numbers such that the least common multiple of EVERY n-1 of them is equal to lcm(a_1, ..., a_n) = m. Is it true that a_i = m for some i? The method I've tried so far is to build systems of equations using the...

Homework Statement I am trying to solve problem 1.4 from Statistical Mechanics by R.K. Pathria 2nd edition. This is the problem: In a classical gas of hard spheres (of diameter \sigma), the spatial distribution of the particles is no longer uncorrelated. Rougly speaking, the presence of n...

Hi guys I need help with my pc I use for my projects and programming.It doesn't want to boot from the hard drive and really need it to because I have some very important information in it. I am not good with hardware(hope one day i will) but have tried everything I can to get it working...

"Hard" Spectrum What exactly is meant when a spectrum is said to be "hard" or "soft", or "harder"/"softer" compared to a different spectrum? Cheers, Nick

Hello all. I have a dell inspiron 1525 laptop, and I've had it for about 4 months. I've been downloading music here and there, but nothing too major. Earlier this week I realized that my computer had used about 70gb of memory, and I had no idea where it was. So I downloaded a disk analyzer...

Homework Statement A cannon is firing from an elevated position 100 m above a target 800 m away. The ititial velocity of the cannon is 500 m/s. Homework Equations Vx = VCOSq Vy = VSINq a = (Vf - Vi)/(t) Vf = Vi + a t s = 0.5 (Vo +Vf)t Vf2 = Vo2 + 2aS S = Vit + 0.5at2...

I started learning limits and I have some difficulties qith this question; Find the limits or say why they do not exist. a)lim_{x\rightarrow2}\frac{\left|x^2 + x -6\right|}{x-2} b) lim_{x\rightarrow0}\frac{\sqrt{4-x}-2}{\sqrt{x+1}-1} 3. The Attempt at a Solution a)we have an...

It's done me good service since 2002, but about three days ago, my desktop machine refused to boot. So I did some digging on the Microsoft help site, configured my BIOS to boot from CD, and stuck in my Windows XP disk to attempt to repair Windows. Attempted to start Recovery Console, but it...

Homework Statement A long line connecting Earth and the Moon, at what distance from Earth's centre would an object have to be located so that the gravitational attractive force of Earth on the object was equal in magnitude and opposite in direction from the gravitational attractive force of...

I am solving the following simple looking nonlinear PDE: (\partial f / \partial t)^2 - (\partial f / \partial r)^2 = 1 Using different tricks and ansatzs I've obtained the following analytic solutions so far: f(r,t) = a\, t + b\, r + c, \,\,\,\, a^2 - b^2=1. f(r,t) =...

My background is calculus through differential equations and linear algebra at a community college. How hard is an intro to probability theory at a school like UCLA?http://www.math.ucla.edu/ugrad/courses/math170ab/170Aoutline.shtml I'm thinking about taking it this fall.

I was out in the bushes this weekend. Monday I managed to get stung hard by a hornet. Much worse than the usual flyby stinging since I was managing to squash it at the time. Don't recall seeing these before. It had a yellow jacket color pattern, but skinny with a straight rather than...

http://img295.imageshack.us/img295/2538/q1qj1.th.jpg http://img410.imageshack.us/img410/307/a12ku8.th.jpg I am having trouble with the final part of this question - part f; I can do all the previous parts. I have attached the questions and markscheme, and so woulkd appreciate it if someone...

What do you know about the hard sphere model? and for this model used for colloids and polimers in fluids?

Last night Tsu fell and broke her hip, and immediate surgery was required. She will be in surgery tonight and should be able to come home tomorrow. As of right now, she is in the hospital waiting for an operating room, and I came home for some odds and ends, and food. Apparently she just...

im stuck on the top question on part B i can do the difference of 2 squares on the LHS but how do i get rid of the cosec²x - cot²x ?? Thanks

[SOLVED] I think of it as hard proof by induction Homework Statement given for the sequence a_1,a_2,a_3,a_4,...,a_1=1 and that a_{n+1}=(a_n+\frac{1}{a_n})^{\lambda} where\lambda>1.Prove by mathematical induction that,for n \geq 2 a_n \geq 2^{g(n)} where g(n)=\lambda^{n-1}...

when I was running a standard check on my HDD I found when I ran my disk filler (to completely delete my files PM me if you don't understand) i found 2Gb would not write i checked the binary point only to find it was empty.. absolutely nothing (just before anyone says my OS is on a separate part...

I just graduated this May with a B.S. in applied and pure mathematics. I plan on coming back next semester to do 3 research projects and reapply for graduate school, but in the meantime I was hoping to find a summer job. I am having an absolute nightmare finding a job. I would have thought...

I have a HP iPaq 1900 that only has an SD card slot and an iPod hard drive with 20gb and ata 6. SD cards are too expensive and I want to make use of my hard drive. Is there a way you can think of that can connect the hard drive to the iPaq? I was thinking of buying an SD card...

Hello everybody.. my name is Rohan Prabhu and I am tanked. The results of the various entrance exams to colleges that i gave have started coming in.. and i have tanked like hell in all of them. Now there are two options in front of me: Either take whatever college I get.. whatever degree I get...

Help me….my hard disk is damaged! Hi everyone , I am employed as a manager in a firm. I have a problem that I had like to talk about. My system was working fine the other day, but while copying a file by nero….the system hanged and I had to restart it. But I got a disk boot failure error. Then...

Hello! I need to know whether the hard disk is on or off during the following states (in windows vista): -During Standby -During Hybrid Standby -During Hibernation Note that I mean by on that the hard disk is spinning regardless if it is reading,writing or doing nothing. Please I need...

heat! so hard. true or false 1.The entropy of a system can never decrease 2.All Carnot engines are reversible 3.It is impossible have a net transfer of heat from a cold reservoir to a warm reservoir 4.A refrigerator lowers the entropy of the volume inside 5.If the temperature...