Lost Definition and 564 Threads

The problem is: S = an^2 + bn Where a and b are constants. Possible values for S are: 6, 15, 27, 42 and 60 Possible values for n are: 1 when S=6, 2 when S=15, 3 when S=27, 4 when S=42 and 5, when S=60. I am asked to find the values of a and b. The way I tried to tackle it was...

I lost the bath plug, and could not use the one from the kitchen sink as i lost that months ago, (where do they go), any way i came up with the idea of using cling film to block the plug hole, i thought a square of it smoothed over the hole would work well, have you ever tried to get a sheet of...

So yeah get a call from my roommate on friday saying I have to get home right now because our apartment has been broken into. Come home to find our patio door had been smashed in, they took all of our computers ( 3), our jewelery, cameras, mp3 players, even some clothes. And the worst part is...

A spool of thin wire (with inner radius r = 0.50 m, outer radius R = 0.65 m, and moment of inertia Icm = 1.06 kg*m2 pivots on a shaft. The wire is pulled down by a mass M = 1.35 kg. After falling a distance D = 0.54 m, starting from rest, the mass has a speed of v = 70.200 cm/s. Calculate the...

percent of energy lost? I'm confused... I have a case where block 1 moves with certain velocity, hits block 2 (that is at rest) and sticks to it - inelastic collision. Now, the problem is that I have to find the percent of energy (kinetic) that the first block has lost. I know that the...

What will soon – within 50 years or less - be history. I have a lifelong habit of trying to guess how, why, when, and what customs, organizations, significant problems, familiar activities, devices, structures, or technology commonly used or seen today, will disappear as a function of...

A railroad car of mass 2.49 104 kg, is moving with a speed of 3.89 m/s. It collides and couples with three other coupled railroad cars, each of the same mass as the single car and moving in the same direction with an initial speed of 1.95 m/s. (a) What is the speed of the four cars after the...

woudl anyone know how to do this by any chance?:rolleyes: The temperature of a swimming pool is 32ºC at 2 p.m. in the afternoon. At 6 p.m., its temperature decreases to 26ºC. Given the pool contains 1200 liters of water and water’s specific heat is 4.186 J/gºC. How much heat does the pool...

Hello everyone I'm revewing a proof by strong mathematical induction and it seems to be making sense all the way up to this point: Since (1.7)^2 = 2.98 > 2.7, we have... WHy did he compare 1.7^2 > 2.7? we've been using 1.7 the whole time. http://suprfile.com/src/1/3rop3a0/eee[/URL]...

A crate of mass 11.0 kg is pulled up a rough incline with an initial speed of 1.50 m/s. The pulling force is 100 N parallel to the incline, which makes an angle of 16.5° with the horizontal. The coefficient of kinetic friction is 0.400, and the crate is pulled 5.65 m. (b) How much mechanical...

A particle of mass m is subject to a force F(v) = -m(alpha)v^2. The initial position is zero, and the initial speed is v nought. Find x(t)

This is my first quarter at UW (2 years community college before that). 2 of my profs from the classes I'm taking (math phys and astro) just don't give a damn about anybody. The math phys guy expects you to already know the material that he is about to teach. The astro guy makes up his own...

Hey, I'm completely stuck and lost on this problem. The question is: You are given a treasure map and it says "Start at the old oak tree, walk due north for 550 paces, then due east for 120 paces. Dig." But when you arrive, you find an angry dragon just north of the tree. To avoid the...

I am not sure I can solve this, I am confused that I do not have the information I need. I am lost and my prof is of little help. A spring gun projects a ball at an angle of 45 degrees above the horizontal. The ball has a horizontal range of 32 feet. What is the maximum height to which...

Another Catch Problem I'm lost at! My physics teacher is spitting these catch problems at me like a maniac. Here's the question (it was on my test and I was partially clueless): A girl is trying to running as fast as she can at a constant velocity of 4.5 m/s . She is trying to catch her...

I Have a small problem. I know the following: The series: S_{n} = 1 + 2 + 3 + 4 + 5 = \sum_{i=1}^{n=5}i 2S_{n} = 1 + 2 + 3 + 4 + 5 + 1 + 2 + 3 + 4 + 5 = n(n+1) = n^{2} + n Therefor: S_{n} = \frac{2S_{n}}{2} = \frac{n^{2} + n}{2} \sum_{i=1}^{n=5}i = \frac{n^{2} + n}{2} = \frac{25 +...

http://img74.imageshack.us/img74/3570/pict00011ms5.jpg Question The picture shows a gutter which is a trapezium same leg. Given the length of the leg are 10 cm including the base of the trapezium. Count the part of the open top part of the trapezium , d , so that the gutter can support the...

I got a voicemail on my phone this morning from a girl who was working on a video for a friend, and she accidently saved over her file with basically an empty version. She was wondering if there was anyway to get back the file she was working on. I was looking into programs like "Recover my...

I may not be as observant as other football-crazy people out there, but I received a forwarded mail showing stills of Zidane's free kick from the quarter final match. Henry was free to do almost anything in the space he had, but if you notice closely, one of the Brazilians (supposedly Roberto...

He and his wife were supposed to be my best friends, i fixed their burst pipes ,installed outside lighting for them, lent them my car and money, and now their house is sold, and not a word to me, people are scum.

I was going to post this in the World Cup forum, but there isn't an appropriate thread. It is more of general interest than the WC, and applies to anyone traveling to some place unfamiliar. Soccer Fan Spends Six Hours Hunting for Hotel :rolleyes: Reuters Know where you are, and know where...

Can someone direct me with the steps that are needed to solve this question thank you very much for your help! What is the pH of a solution resulting from the mixing of 100 mL of 0.250 mol•L-1 KOH solution with 200 mL of 1.20 mol•L-1 HNO3 solution?

I am hoping one of our French speakers will wander by and will help me out. I hope I am expressing myself correctly. In my paragraph I want to say: I am sure that you will adore Brittany. There are beautiful cliffs overlooking the sea. Brittany is famous for nice weather. The people of...

A sample containing NaCl, Na2SO4, and NaNO3 gives the following elemental analysis: Na:32.8%; O: 36.01%; Cl:19.51%. Calculate the mass percent of each compound in the sample

hey guys! i am lost with my current unit...redox reactions. i was wondering if any chem whizzes could lead me in the right direction as how to write the oxidation and reduction equations for the following reaction: IO-3 (aq) + I- (aq)--> I2 (aq) Any help would be greatly appreciated! I...

One end of a horizontal string is attached to a small-amplitude mechanical 57 Hz vibrator. The string's mass per unit length is 4.4 10-4 kg/m. The string passes over a pulley, a distance L = 1.50 m away, and weights are hung from this end Assume the string at the vibrator is a node, which is...

Have you ever made contact with an old friend not seen for many years? Today I talked with my very first friend in life. We first started playing together at the age of one year. When I was in my late teens, when my family left S. Cal, Dave and I lost contact up until today. I did see him for...

"Lost" (TV Show) Equations Recently my favorite tv show (Lost) featured an episode in which a bunch of equations were quickly presented on a cool little black light map. These equations are beyond the realm of most layman, so I figured Id come here to see if you guys have any idea what these...

"I lost all faith in my education" (mentally) I took a test in my Linear Algebra/Differential equations class today Actually, the test took me and it did a good job of chewing me up and spitting me out. I'm guaranteed an F on it. I left that room feeling violated. 5 questions, most...

1. A daredevil on a motorcycle leaves the end of a ramp with a speed of 35 m/s. If his speed is 33 m/s when he reaches the peak of the path, what is the maximum height that he reaches? Ignore friction and air resistance. I don't know how to approach this problem or set it up? Do I use...

Hello, today my teacher presented us with the concept of derivatives. I was okay in class, but when I got home, I was completely lost. Using the definition (f(x+h) - f(x))/h, we have to fine the derivative of y=2x^2 - 5. I know the answer is 4x from the back of the book, but I can't understand...

http://news.bbc.co.uk/2/hi/science/nature/4688000.stm

A violent rainstorm dumps 1.7 cm of rain on a city 6.0 km wide and 8.0 km long in a 3.0 hr period. How many metric tons (1 ton = 103 kg) of water fell on the city? [1 cm3 of water has a mass of 1 g = 10-3 kg.] any help would be greatly apreciated!

It'd be best if I start with example. Screwdriver helps us by having a handle with a large radius that provides a mechanical advantage in turning a blade with a smaller radius. So whatever force exerted on screwdriver's handle by hand, same force is exerted on screw. But torque on a handle is...

know there two problems are very easy, but for some reason I just cannot figure them out. Here are the two questions that I have. Does anybody know what the answers are to them? If A = (25 m) x + (-12 m) y, and B = (2.0 m) x + (17 m) y, find the direction and magnitude of each of the...

And doign some old review I'm going to need some really simple help. (Hah, grade 11 physics :rolleyes: ) 200 N accelerates a 20kg sled at 8.0m/s^2 It's asking the force of friction.. Just give me a formula please :)

When you're cold, your body naturally burns calories to keep you warm. So it makes sense to me that if people were to just stay out in the cold enough, that they could lose some weight. Also, it seems that you could probabally figure out a formula to determine exactly how much weight you'll lose...

Anyone else indulge in this show? I didn't watch the first season much, but the second season has me gripped! Who's your favorite character? I like Jack :biggrin:

Hey everyone =) I am nearing my completion of the chemistry unit, and I have to do a huge lab report before I write my unit test..:frown: For the lab basically, we are comparing acid-neutralizing capabilities of baking soda and antacid substances. We are going to.. - mix measured amounts of...

A 991kg car traveling initially with a speed of 32.2m/s in an easterly direction crashes into the rear end of an 8650kg truck moving in the same direction at 17.8m/s. The velocity of the car right after the collision is 10.4m/s to the east. How much mechanical energy is lost in the collision...

hello The following is really giving me troubles *What is needed for an object to circle around the earth? Let me rephrase this...what conditions need to be met for an Earth's gravity force to act as centripetal force instead of just pulling an object towards its center? *When you...

The question is: A 15.7 kg block is dragged over a horizontal surface by a 68.7N force acting 17 degrees to the horizontal. The block is displaced 4.65m, and the kinetic friction coefficient is 0.3. What is the energy lost to friction? My thinking is that it would be equal to the negative...

In a rotary vane compressor, the vanes constantly move in and out. Does the work required to accelerate the vanes radially outward and then inward cancel out or is the kinetic energy of the vanes lost and completely converted to heat?

OK, so I've been there before, Hilbert Space that is. You know, infinite dimensional function space. At least I thought I had, that is until I started reading A Hilbert Space Problem Book by Halmos. So operator theory, right. What's are bilinear, sesquilinear, conjugate linear, ect. -...

Yeah, so I am not too smart as I encrypted a file in Winace and now have forgotten the password for it. Are there any programs out there to get the pass or get through it, or any other way in which to access the files now that I forgot my password? Thanks in advance for any help you can...

I just had a midterm for my calc class and there was this one question that I spent a good 20 minutes on and could not figure out. can someone help me with the solution please? lim x→0 (sin x²)/sin²x I can do it using L'Hopitals rule, but that wasn't allowed :rolleyes:

Basic Physics...?? Hey Everyone, I just started the course and the first problem I come to, so very confused me! I don't need an answer just a basic response on exactly HOW I can approach this problem because I am just totally blown away by it . Two trains, each having a speed of 30...

After I have stripped the filters then one of my filters lost all the signals even the signals of the MW marker. What is wrong? The protocol for stripping is this: Warm the stripping buffer (62,5mM Tris-HCl pH 6.7 and 2% SDS) to 50C and put the filter in it for 30min at Room Temp (RT). Wash...

Hi, its me...AGAIN! You people should start CHARGING for your services! I have a conceptual problem more than just a homework problem this time. It regards free fall distance and the formula applied. Okey dokey...the formula to find out how far an object falls from rest is: d=1/2 gt^2...

sorry this is such a stupid question...but i have been sitting her for half an hour trying to solve it. what does a^2-4a-12 factorise to?