Figure Definition and 590 Threads

Homework Statement integral of x*e^x from 0 to infinity Homework Equations N/a The Attempt at a Solution i first integrated the integrand and got (xe^x - e^x) then i use limit as R approaches infinity and used 0 and R as my limits. when calculating i keep getting 1 instead of...

Hello, I just couldn't understand how solver comes up with the equation at line 5 of the part b. (equates t (time) to other variables). I think the first 4 lines are enough to figure out this equation so i am not posting the question. i will be grateful if you'd help...

Hi all, How could I get a small figure and a set of equations to appear side by side? Thanks

1.) How is the instantaneous speed obtained from a speed-time graph? 2.) I ADDED A PICTURE OF A TIME GRAPH USED FOR THESE QUESTIONS: http://i36.tinypic.com/wkh8gx.jpg (the left numbers are distance, the bottom numbers are time (min) A. which graph illustrates a constant speed for the...

Velocity question...i can't figure it out :( A person throws a baseball straight up from the ground. The baseball leaves the persons hand with an initial velocity of 10.0 m/s [up]. The acceleration of the ball is 9.81 m/s 2 [down]. Assume up as the positive direction. a. what is the velocity...

I'm still trying to pick the proper field within engineering. I'm an older student (26) with close to 10 years experience supervising/operating a shift at a wastewater treatment plant. I've also held the lab technician position for a number of years as well. My interests are in designing...

I read the rules of the site and read the stickies, I hope this is in the right section. I need help figuring out this algorithm, putting a number in generates the corresponding numbers. Sorry if the post is long, I tried to get as much information as possible. I can enter any number that...

I just don't understand why it goes like this...why 'therefore'? i know (x^2)f''(x)+xf'(x)+((x^2)-1)f(x)) = x(xf''(x)+f'(x)+xf(x)) - f(x), but why it goes to zero when taking (d^n/dx^n)?

why the equivalence? there must be some formula for this...just i donno. i really need some hints! thank you guys!

HELP! Please! I only have 1 more day to figure this out! If there is ANYONE out there who is a kind enough person to help me with this (and knows how to do it!) I would be VERY grateful! I only have one more day to work on these problems! Thank you so much!:confused: For the following...

I cannot figure out what is wrong! (frustrated) Homework Statement An electron in a cathode-ray-tube (CRT) accelerates from 4.00 x 10^4 m/s to 6.00 x 10^6 m/s over 2.50 cmHomework Equations How long does the electron take to travel this 2.50 cm?The Attempt at a Solution (4.00 x 10^4 + 6.00 x...

Since the present idea is that the known Universe (include dark matter) was once condensed into a tiny singularity; and since this 'exploded' into what we now see, how can we measure time of events? Or describe how 'large' the Universe was at any point in time? In other words, I'll read...

Mathematical Derivation of Significant Figure "Rules" Let's say I have a scale which can accurately read weights out to ten-thousandths of a gram so it might read 1.0005 g or 0.0005 grams ... why is it that the first reading has 5 significant figures and the second has only 1? Same instrument...

Homework Statement Suppose that you are given the following PetDriver class, which includes a main method: public class PetDriver{ public static void main(String[] args){ int weight = 40; Pet doggie = new Pet("Rover", weight); System.out.println("my pet's name is "...

Okay I have been doing unit analysis homework and it is generally easy however a few questions I use the same logic but cannot come up with the correct answer. Keep in mind the homework is turned in electronically so the answer must be exact but without the aid of expressions or ratios etc to...

Hi all, I am trying to solve numerically as well as model the electric field lines coming out of a electrode (not a point charge) in a dielectric medium. ANy suggestions would be greatly beneficial _________________________________________________ _ separated by d + separated by d _...

Hi! How do I make a line from a point to another point in Mathmatica, a 3D image? Also, if you got any tips on how to do this: I have a 3D pyramid and a plane("a window"). Behind the plane there is a point "An eye looking at the pyramid". I need a line from every corner of the pyramid...

Who can figure this one out? The topic of discussion amongst my friends and I: What is the probability of the sum of a football game landing on odd versus even. My friends say that it is a simple 50/50 coin toss. My rebuttal is that while in football the only integers that can be...

I am building an "alternative fuel" motorcycle. But i am having trouble figuring out what size motor i need to use and how much torque it needs to put out. I have already figured out my top speed, (I am limiting the prototype) and also the RPMs of the drive tire at that speed. I also...

Homework Statement Question 1. Find the sum of the measurements 896 g, 55.2 g, 0.63 g, and 3.5 g. Question 2. How many significant figures are in the measurement 60,000,000 km/s?Homework Equations The Attempt at a Solution Attempt on #1: 955.33 g (wrong ans) Attempt on #2: 2 sigfigs (wrong...

Homework Statement ∫ 1/cos theta before it was ∫ sec theta but i know that sec theta is equal to 1/cos theta would i write it as 1/2 ∫ cos theta and then 1/2 sin theta

Homework Statement (1-u^2)/(sqrt u)

Hi all. i am integrating in MATLAB and plotting the results in a y-verically and t-horizontally. Matlab automatically plots y versus the time step which is great. but what i need to do is re-label the t-axis so the actual time appears instead of the time step- so instead of from 0 to 1200, it...

I've been trying out this problem for hours and can't figure it out. A helicopter is moving horizontally to the right at a constant velocity. The weight of the helicopter is W = 52100 N. The lift force vector L generated by the rotating blade makes an angle of 21.0° with respect to the...

Hi, I am struggling with a problem and do not know how I should approach it. I went to a baseball game with my son, where I bought him a packet of M&Ms. While eating the candy, my son asked me what color most of the M&Ms are. At first, I intended to tell him that there are equal numbers...

Homework Statement find the magnetic field at point P in the figure below: (see attachment) Homework Equations magnetic filed B = integral[dB] = mu_0/4pi (integral[I(dL)/r^2]) where mu_0 is constant = 4pi*10^-7, I is current, dL is change in length, r is radius The Attempt at a Solution...

Homework Statement Friend's fiancee gave this problem on a final she was administering and isn't sure how the answer key is right: Boyle's law describes the inverse variation between the volume of a gas and the pressure, y, exerted on it. A balloon with a volume of 2.25 liters is sealed in...

Homework Statement A 4000lb uniformly weighted crate is attached by light inextensible cables to the trus show below. Simply determine the reaction at A and E of the truss show below Figure 1 attachment Homework Equations I used the Moment arm equation of M = F*Distance The Attempt...

A wedge with an inclination of angle theta rests next to a wall. A block of mass m is sliding down the plane, as shown. There is no friction between the wedge and the block or between the wedge and the horizontal surface. 1) Find the magnitude, F_net, of the sum of all forces acting on the...

Homework Statement For a two DIMENSIONAL figure of given perimeter why does the circle have the largest area? Similarly, of all three dimensional figures of given volume the sphere has the largest area. why? Homework Equations The Attempt at a Solution

[SOLVED] Quick Question...I have the answer with steps, but can't figure out how th Homework Statement Two charges of 1.5x10^6C and 3x10^-6C are .20m apart. Where is the electric field between them equal to zero?Homework Equations The Attempt at a Solution Variables r(total)= .2m q1=...

Figure 2-4 in "Spacetime Physics" by Taylor & Wheeler The figure illustrates the effects of free float on the perceived trajectory of a ball thrown in a room that is on a ledge and then in a room that is sawed free from the ledge. In both cases, the ball is launched at the same speed and...

Homework Statement This figure is driving me insane. How can the energy gradient point inwards! For the hole orbit. The shading represents filled orbits (I am pretty sure), so how can you possibly have orbits filled everywhere except the center of the First Brillioun zone. That is outrageous...

<- Paul Berg's Protein synthesis: an epic at the cellular level Chances are if you took a biology class where you learned about the cell, you saw this video when you went over protein synthesis at the ribosomal level. In the beginning of the video Paul Berg provides a very brief overview of...

I can't figure out what I am doing wrong! Getting Frustrated! Homework Statement A helium-neon laser (λ=629 nm) illuminates a diffraction grating. The distance between the two m=3 bright fringes is 33 cm on a screen 1.72 m behind the grating. What is the spacing between slits of the grating...

[SOLVED] Griffith's Figure 2.24 Homework Statement This question refers to Griffith's E and M book. In the paragraph above this figure, Griffith's says that the E-fields cancel in regions i and iii. He does NOT mean cancel completely, correct? That is, the field is NOT 0 in those two...

A Uniform pool ball mass 'm' and raidus 'r' begins at rest. It is given horizontal impulse J of fixed magnitude at a distance br above its center where -1<=B<=1. Coefficient of kinetic friction between ball and table is u. Assume both ball and table are rigid. Find an expression for the final...

Hi, I am trying to figure out what exactly a dyadic is, and how to evaluate an expression in dyadic form. I have the impression that it is related to tensors. Please let me know of any good links on the web if there are, and thanks for the help!

Ok, i have a question. I have an answer but i don't really think it sright or i am doing it right. Can anybody explain to me how to go about doing this question, and give me the answer so i can know if i am doing these kinds of questions right? Here it is: A line passes through the point...

Homework Statement (1) the torso, neck, and head (total mass = 42.3 kg) with a center of mass located on the y-axis at a point 0.423 m above the origin, (2) the upper legs (mass = 19.8 kg) with a center of mass located on the x-axis at a point 0.190 m to the right of the origin, and (3) the...

Homework Statement 1. A displacement vector has a magnitude of 810m and points at an angle of 18 degrees above the positive x axis, What are the x and y scalar components of this vector? 2. A displacement vector is 23 km in length and directed 65 degrees south of east What are the...

[SOLVED] Moment of Inertia tensor SETUP, not to difficult but can't figure it out Homework Statement a) For a cylinder of mass M, radius R and height h, calculate the inertia tensor about the center of mass. What are the principal axes? Homework Equations The Attempt at a Solution...

can't figure this one out! does anybody know why a motorcycle is more aerodynamically affected than a truck?? really thought hard about it but just can't figure it out! is it because of the two tyres?? Thanx khalid..

dy/dx= 1/(x^2-xy) I have tried all the basic steps in an attempt to make it take the form of: separable exact homogenous bernoulli linear I have tried substitution with: y=ux u=x-y u=x^2-y I cannot for the life of me figure this out, thank you for any help.

during my study on conics , I found a formula in the book regarding the classification of figure from the general equation of conics ax2+2hxy+by2+2gx+2fy+c=0 it was given that \Delta=abc+2fgh-af^{2}-{bg}^{2}-{ch}^{2} if \Delta \neq 0 then if h^{2}=ab...parabola h^{2}<ab...ellipse...

I can't figure out what I am doing for nothing! Max Torque...Please Help! Homework Statement Two small plastic spheres, one charged to 18.95 nC and the other to -18.95 nC, are connected by a 50-mm-long insulating rod. Suppose this dipole is placed a uniform electric field with strength...

I'm doing some basic factoring now to refresh my skills. On one problem, it is asking to factor: (y^2 + 8)^2 - 36 y^2 I was able to get to where I factor the trinomials: (y-4)(y-2)(y+4)(y+2) When it says to give the summary of factorization, it gives: (y^2 + 8)^2 - (6y)^2 I'm going...

[SOLVED] Made a small mistake and can't figure out what to do--&gt;Projectile motion Homework Statement Ball is launched at 62 degrees above horizontal at 22 m/s. What distance does the ball travel? Homework Equations x=x0+vx0t The Attempt at a Solution x0=0 vy0=22 m/s y0=0...

Please help - How do figure skates work...? How exactly do figure skates work? and how do the materials used help and how do figure skates improve a skaters ability to skate? any links, commments and answers would be appreicated, thank you.

Homework Statement A regular polygon of 11 sides is on an adjustable incline. The polygon has sides on 1.32 meters each. At what angle of the incline will the polygon tip over. Extra: what is the area of a cross section of the polygon. The Attempt at a Solution This problem has to do with...