Stuck Definition and 836 Threads

:confused: I am having trouble answering this question...what is the answer?! HELP Suppose you are in an elevator that is moving upward with a constant velocity. A scale inside the elevator shows your weight to be 600 N. (a) Does the scale register a value that is greater than, less than...

I have an equation on my homework that looks like this. \frac{x}{2}+ \frac{x}{3}+10=x I have to solve for x but have no idea what the first step is. I know I'm making it more complicated than it is, but it's been awhile since I was in Algebra 1! Any ideas??

the question is how far away was a cannonball fired? we know that the -cannonball ricocheted along the ground an unknown amount of times before hitting the persons kneecap and shattering it. -a three pound cannon ball has a mass of 1.36kg -the maximum range of the cannon is 1125m -the...

Prove that for all integers n, n^2-n+3 is odd. stuck on algebra part :( The question in the book is the following bolded statement. Prove that for all integers n, n^2-n+3 is odd. I rewrote it as this, is that right? For all integers n, there exists an integer such that n^2-n+3 is odd...

I don't know if there's anyone who bother to answer my questions but still let me try.. If function f:R^2-->R is f(x,y)=0 if (x,y)=(0,0) and xy^2/(x^2+y^2) otherwise, then prove that f is not continuous at (0,0) Supposed to be easy but my brain is dead right now for this.. it's multivariable...

I been stuck on this homework problem for about an hour. A truck covers 40.0 m in 8.25 s while smoothly slowing down to final speed of 2.05 m/s. (a) Find the truck's original speed. m/s (b) Find its acceleration. m/s2 I was told to use this V^2 = Vo^2 + 2AdeltaX but became lost.

http://tinyurl.com/hjybb thats a picture of the problem, anyone know how to solve it??

Hi, I'm stuck on the following problem: |(4/x)| > 5 I split it up into two cases, case 1 is x > 0, case 2 is x < 0 Case 1: Case 2: 4/x > 5 4/x < -5 4 > 5x 4 < -5x 5x < 4 -5x > 4 x < 4/5...

The starship enterprise returns from warp drive to ordinary space with a forward speed of 50 km/s. To the crew’s shocking surprise, a Klingon ship is 100 km directly ahead, traveling in the same direction at a measly 20 km/s. Without evasive action, the Enterprise will overtake and collide with...

Hi, I am kinda stuck on the following integral: \int\sqrt{\frac{1+x}{1-x}}dx any hints?

i'm stuck on a problem. Let's say you have a large water tower. and the pressure is basically static pressure from the weight of the water. But when the water starts moving through pipes is the pressure then dynamic pressure? In which would you have to calculate the pressure from 1/2 density of...

hi all, have a rather sticky problem on determinants to deal with...hope someone can offer some help. [In what follows, the numbers in brackets denote suffixes, so that, for example, A(s)(j) refers to the element in the sth row of A and jth column of A.] Let A be an n x n matrix. Let s be a...

This is a problem I tried a couple days ago and I got stuck on some parts.Here is the problem /int sin^2 3xcos^5 3x dx Can anyone help me out?

This is the problem (exact wording): An infinitely long rod is being rotated in a vertical plane at a constant angular velocity w about a fixed horizontal axis (the z-axis) passing through the origin. The angular velocity is maintained at the value w for all times by an external agent. At t =...

An open container holds 0.550 kg of ice at -15 Celsius. The mass of the container can be ignored. Heat is supplied to the container at the constant rate of 800 J/min for 500 min. A) After how many minutes does the ice start to melt. This part I calculated and got correct, it's 21.7 min...

Hey guys, I got stuck doing these HW problems and I was hoping someone could give me some hints on how to solve them. 1.) 4 * 3^(X) = 7 * 5^(X) 2.) 2^(X) = e^(X+1) Any help would be appreciated. TIA

The sum of two intergers is twenty. Five times the smaller interger is two more than twice the larger integer. Find the integers. I'm somehow lost on the problem I tried setting the problem up to solve for the smaller varrible. Making it x & the larger 20-x. Anyway, I came up with 5x...

1. A ship with a long anchor chain is anchored in 11 fathoms of water. The anchor chain is being wound in at a rate of 10 fathoms/minute, causing the ship to move toward the spot directly above the anchor resting on the seabed. The hawsehole ( the point of contact between ship and chain) is...

Okay, so I was given the parametric equations of x = (cos(t))^2 and y = cos(t). So I found dy/dt = -sin(t) and dx/dt = -2sin(t)cos(t). This is where I am getting stuck, so I have the L = integral from 0 to 4pi (sqrt((dx/dt)^2+(dy/dt)^2)) , but I don't know how to simplify this to get the answer...

Stuck with problem: There is a local surface \alpha(u) = (f_1(u), f_2(u), f_3(u), f_4(u)) \in R^4. I need to find basis vectors of tangent space on that surface in some point p. It is not difficult to calculate tangent space for that surface, we should choose some curve on the surface and...

I'm currently studying for a Statistics final, and I'm stuck at some problems. I'd appreciate any help I could get. Question #1 Determine the minimum sample size needed to estimate a population mean with a margin of error of 24 and a confidence level of 95%, if the population standard...

Hi there I'm stuck on one of the normalization question, I'd be glad if you can help me out. The questions is, psi(r)=Ne^(-ar) where N is a normalization constant and a is a known real parameter. Solution reads, 1=int dr lpsi(r)l^2 = 4piN^2 int (from 0 to infinity) dr r^2 e^(-2ar) What I...

"The probability that a seed will sprout is 3/4. If 7 seeds are planted, find, to the nearest ten-thousandth, the probability that at least 5 will sprout." The answer is .7564, but I don't know how to get there. I tried (3/4^5) + (3/4^6) + (3/4^7), but that doesn't work. Neither does (3/4*5)...

Hey. Heres the question: Two boats are moving along straight paths and their position vectors at noon are: For the first question, i assumed its initial position would be 0 hours after noon. So i just answered it as: 7\mathbf{i}-5\mathbf{j} Now i wouldn't have a clue if that's even...

Hello everyone! I got some parts of this question right but are stuck on others. Here is the problem: The equation of a transverse wave traveling along a very long string is given by y = 6.1 sin(0.010x + 3.0t), where x and y are expressed in centimeters and t is in seconds. Determine the...

Hello everyone. I was hinted by a member that I should use pythagoris and some trig to figure the length out. It all made sense but now I'm not getting the right answer and I'm wondering if its becuase I assumed the first triangle had a length of 3.10, because it said the bird is 3.10m from...

I have been asked to find the area between the following curves f(x)= x^3 -9x^2 +18x and g(x)= (-x)^3 +9x^2 -18x I started out by finding the points of intersection, which I found to be 0, 3, and 6. I then integrated |f(x)-g(x)|and evaluated between 6 and 0. I got an answer of zero but it...

Hello everyone! I remember doing these in calc II, but forgot 99% of it. Here is the question: Find the interval of convergence for the given power series. http://cwcsrv11.cwc.psu.edu/webwork2_files/tmp/equations/5e/119a4cd07ce5d3f6f673477ed169641.png The series is convergent from x = ...

I have a question on dropping ice (-10 celsius) into water (20 celsius). What is the final temp? i have used Q = m.c.delta T between -10 and 0 I know i have to use Q = m.l for the phase change and then agian use Q = m.c. delta T to find a final temp. How do i relate these two...

i have a double integral to reverse the order of and then integrate, i have reversed the order fine, however i am VERY stuck on the integration of the function in the first integral integrate sin(y)/(x+y) dx between 0 and y any pointers greately appreciated

Problem 1: here is what i did: knew to find the acceleration I needed to use a=QE/M, but since I didn't have E I had to find it. Used F(mag field)=Q*V*B*Sin(theta). I found theta from drawing the ijz axis and using trig, I got 59 degrees. After I solved this I plugged it into F=QE to...

I'm confused on how to equate coniffecents. What I'm doing is, finding a particular solution for just the polynomial then I'm going to find it just for the exponential and add them together rather then putting it all together and making it a mess, but I'm stuck when i try to add the...

Hello eveyrone, I think my brain just shut down, I'm confused on how i would take the derivative of this function i have circled below: http://img100.imageshack.us/img100/1671/lastscan2vi.jpg I know the chain rule, like if it was t*e^(-5t) = e^(-5t) + t*(-5)e^(-5t)

Hello everyone, we just started 2nd order differentials, and i was loooking at his example and it made senes but now I'm doing the homework and I'm stuck. Here is the problem: Find y as a function of t if y'' - 3y' = 0, y(0) = 9, y(1) = 7 . y(t) =? Well there is my work...

Sound Waves Problem and I'm Stuck! Please Help! Linear Superposition The sound produced by a loudspeaker has a frequency of 12,000 Hz and arrives at the microphone via two different paths. The sound travels through the left tube LXM, which has a fixed length. Simultaneously, the sound...

I keep trying to get this right but I keep falling short. Here's the problem: A hoodlum throws a stone vertically downward with an initial speed of 19.0 m/s from the roof of a building, 39.0 m above the ground. (a) How long does it take the stone to reach the ground? (b) What is the speed of...

It's a nice li'l series. The question is to find an expression for the series S=1^3-2^3+3^3-4^3+...-(2m-2)^3+(2m-1)^3 where m is a subset of N I added and subtracted sum of even squares to get S={1^3+2^3+3^3+4^3+...+(2m-1)^3}-{2(2^3+4^3+6^3+...+(2m-2)^3)} Replaced the first part...

alright, so I'm reviewing for a test I have on monday, and I was given a study guide which we must answer in order to get ready for the test. Now I just breeze through this stuff like its nothing, but I've found on discrepency. I even looked up the question online and i got 2 completely...

It is "sin x to the power of 3 over 3". How do I derive this? I am supposed to use the CHAIN RULE. Now the answer I am supposed to get is -sin^2x times cosx. How did "that" happen. How do I chain the monster, 1/3sinx^3? What troubles me is the sinx^3. For a regular sinx, the derivative...

Hi I have been given this following problem: X is a stochastic variable with the distribution Function F_X which is given by: P(X \leq x) = F_{X}(x) = \left\{ \begin{array}{ll} 0 & \textrm{if} \ x>0 \\ \frac{{1- e^{-x}}}{{1 - e^{-1}}}& \textrm{if} \ x \in [0,1]\\ 1 & \textrm{if} \ x \geq 1\\...

1. Heat Transfer A copper slug whose mass mc is 75g is heated in a laboratory oven to a temperature T of 3120C. The slug is then dropped into a glass beaker containing a mass mw =220g of water. The heat capacity Cb of the beaker is 45 cal/K. The initial temperature Ti of the water and the...

i have a tetherball that goes from a radius of 1 m to a radius of 2 m. the initial speed is 1 m/s, what's the final speed? if its 0.5 m/s the energy of the ball halfs so it must be transferred to Earth via pole thickness so the Earth gains kinetic energy so gains momentum,so the momentum...

work help! I'm stuck and about to kill myself A car at the Indianapolis-500 accelerates uniformly from the pit area, going from rest to 320 km/h in a semicircular arc with a radius of 192 m. Determine the tangential acceleration of the car when it is halfway through the turn, assuming...

Let's say I assumed that the answer to a PDE was U(x,t)= XT, where X,T are functions. I then further my answer by getting to a point for T'/T=kX''/X, where k is some constant given in the boundary conditions. I then continue by working on either side to find each function. Suppose I work on...

The aerodynamic drag of a new sports car is to be predicted at a speed of 100 km/hr at air temperature of 25oC. Automotive engineers build a ¼ scale model of the car to test in a wind tunnel, where the air temperature is 10oC. A drag balance is used to measure the drag, and the moving belt...

Right I have been asked to identify the elements of a full symmetry group of a pentagon and give the order of each element? I have found the elements which I have marked as I, R (Rotation of 72 degrees), R2 (Rotation of 144 degrees), R3 (Rotation of 216 degrees), R4 (Rotation of 288 degrees)...

Please help with the following question, completely lost: The behavior of a four stroke gasoline engine can be approximated by the so-called Otto cycle. The process is as follows (6 steps): 1) Isobaric Intake (from V=0) at atmospheric pressure up to volume V1 (maximal volume), Temperature...

According to wikipedia, earworm, a literal translation of the German Ohrwurm, is a term for a song stuck in one's head, particularly an annoying one. Use of the English translation was introduced by James Kellaris, an associate professor of marketing at the University of Cincinnati. His studies...

I'm trying to solve the following equation for y 2y^2 + xy = x^2 + 3 So far I've gotten it down to y = \frac{x^2 + 3}{2y = x} Or I've tried (2y-x)(y+x) = 3 But I'm stuck at that. Any advice would be appreciated.

Hey, I got this question in a homework from a teacher of mine: "A car battery with a 15.0 V emf and an internal resistance of 0.0430 is being charged with a current of 62.5 A. What is the potential difference across its terminals?" I've tried nearly every formula I know on it. EMF =...