Homework Definition and 998 Threads

Homework Statement The intensity of the Sun's radiation just outside the Earth's atmosphere is approximately 8 \cdot 10^4 \frac {joules}{m^2 \cdot min} . Echo II is a spherical shell of radius r_0 = 20.4m. Its skin consists of a layer of Mylar plastic ... between two layers of aluminum. ...

Homework Statement Ts (subscript s) = 2∏*√(4.5*10^-2 kg / 2.0*10^3 kg/s^2) kg = Kilograms s = seconds Ts = ? Homework Equations I do not have any relevant questions. The Attempt at a Solution Ts = 2∏*√(4.5*10^-2 kg)/√(2.0*10^3 kg/s^2) Simplified Ts = 6.28*[(0.212 kg)/√(44.72...

Homework Statement Find the Eigenspace of the following matrix: \begin{bmatrix} 1 & 3 \\ 4 & -3 \end {bmatrix} I'm skipping a few steps but the Eigenvalues are -5 and 3. Let's starts with -5. Skip a few more steps, I know I'm right, just trust me. We now have the following matrix...

Homework Statement If f(x)=x2 prove that \lim_{x \to 2} f(x)= 4 Solution given: We must show that given any ε >0, find δ >0 such that |x2-4|<ε when 0<|x-2|<δ Choose δ≤1 so that <|x-2|<1 ----------------------------------------------- Confuse between the word 'find' and 'choose'.

Homework Statement referring to the attatchment. the current consists of two semi circles. the question asks me to find the voltage across a 47-uF capacitor when t = 2ms. Homework Equations v(t) = 1/C ∫ i(t)dt +v(t0) {I realize their has to be limits for the integrand,I just can't type...

datum 1 --------- E1=K1+G1+S1 =0+8(9.81)(-3)(sin37)+0 =-141.69 datum 2 --------- E2=K2+G2+S2 =1/2(8)(v^2)+0+0 = 4v^2 Frictional Force: 0.15x9.81.8 = 11.772Newtons U1-2= -11.722x2 = -23.544J E1+U1-2=E2 -144.69-23.544=4v^2 -42.0585=v^2 Can't square root...

Hello my apologies if this goes against rules idk if this applies to rules but I was watching Neil deGrasse Tyson talk with Steven Colbert for an hour and a half and at one point he answered a question from the audience by saying that Einstein, being the genius he is created his own way of...

Hi All, I apologize in advance for the elementary nature of my question, but I have made a genuine effort to understand what is going on using a couple of optics textbooks and remain confused. My background is not in optics but I definitely am just missing something basic. I have an optical...

Homework Statement Imagine a function: f(x) = x + sin(x)/K where K is pi cubed. Suppose f(x)^n means f(f(f(f(...f(x))))) n times. Find the value of lim n->infinity f(x)^n Homework Equations The Attempt at a Solution I have no idea on where to start. Can anyone give a hint...

I've been given a school assignment that if I were to, hypothetically, gets a story published on an engineering success story, what publication would I choose and why? Although this is a pretend situation, my professor will take no hesitation to fail the assignment if I am unable to provide a...

Homework Statement **Hope I don't get in trouble for posting a screenshot of this online homework question...** Homework Equations \SigmaFx = marad = \frac{mv^2}{r} \SigmaFy = mgThe Attempt at a Solution Simple equations allowed me to find r = 1.323m and θ = 41.41° \SigmaFx = Tuppersinθ +...

Homework Statement I'm having hard time appreciating this topic since they're not discussed well and, as of now, I still don't have resources or sample programs. We're required to display Az By Cx . . . Yb Za including spaces using DOS debug. Homework Equations The Attempt at a Solution...

Homework Statement A M=1.5kg horizontal, uniform tray is attached to a vertical ideal spring of force constant k=185 N/m and m=275g metal ball is in the tray. The spring is below the tray, so it can oscillate up and down. The tray is then pushed down 15cm below its equilibrium position and...

Homework Statement Ten seconds after starting from rest, a car with a mass of 1000kg is moving at 40m/s. The acceleration of the car is? Homework Equations F=ma or a=v[SIZE="1"]f-v[SIZE="1"]i/t The Attempt at a Solution I have m=1000kg t=10s d=40m/s I am not sure if d is...

A 2-m x 3-m flat plate is suspended in a room, and is subjected to air flow parallel to its surfaces along its 3-m-long side. The free stream temperature and velocity of the air are 20oC and 7m/s. the total drag force acting on the plate is measured to be 0.86N. Determine the average heat...

[URGENT] Need help with my homework! 45minutes left till i have to hand it in Homework Statement a) Bianca wants to make a solar cooker to take on her camping trip what type of mirror does she need? b) Bianca makes a mirror by putting silver foil on an old, cut-up beach ball. The ball...

Homework Statement The following charges are located inside a submarine: 2.00 µC, -9.00 µC, 27.0 µC, and -54.0 µC. (a) Calculate the net electric flux through the hull of the submarine. Homework Equations Flux = q/e0 The Attempt at a Solution I found the net charge, which happens...

Homework Statement show that for positive r and s, with r<s, we always have: r<(r+s)/2<s and 2/[(1/r)+(1/s)]^2< 2rs< (r+s)^2 Homework Equations The Attempt at a Solution i have shown that r<s because r+r<s+r, 2r<s+r, r<(s+r)/2 and 2r< (2s+2r)/4 (r+s)^2= r^2+2rs+s^2...

[a]1. Homework Statement [/b] I thought it would be easier to post a picture since this way the drawing can be seen. I'm having a hard time deciding what angles to use with the relevant equations, see below. Homework Equations I know that: Ex' =...

Hi, have a physics test coming up on Tuesday, and I was wondering if you all would like to help me out with a couple questions! 1) A highway is to be built between two towns, one of which lies 70.0 km south and 72.0 km west of the other. (a) What is the shortest length of highway that...

Just wondered if someone was able to give the homework the once over as I am not feeling confident i have this right. 1. I have a simply supported beam 10metres in length, supported at 2 metres in from both ends. there is a 5Kn U.D.L along the entire length of the beam and downward forces of...

A child loves to watch as you fill a transparent plastic bottle with shampoo. Every horizontal cross section of the bottle is circular, but the diameters of the circles have different values. You pour the brightly colored shampoo into the bottle at a constant rate of 17.0 cm3/s. At what rate...

Homework Statement This is a calc problem but it's the algebra part I'm having trouble with: The Attempt at a Solution [16(1+h)2 - 16(1)2]/h [16 + 32h + 16h2 - 162]/h = 16/h + 32 + 16h - 162 this is a calc problem so h approaches zero = 32 + 16h - 162 = 16(h +...

1) 1. y=x, y=sinx, x=-∏/4, x=∏/2 find the area between these limited curves. 2. ∫(upper function-(lower function) 3. ∫x-sinxdx(between x=-∏/4, x=0) + ∫sinx-xdx(between x=0,x=∏/2). Am I right? If it's okay,I don't have a problem in this integral. 2) 1. ∫sin(2x)/sin^2x(^=power)dx 2. I'm not...

Homework Statement A roller-coaster car has a mass of 1150 kg when fully loaded with passengers. As the car passes over the top of a circular hill of radius 16 m, its speed is not changing. (a) At the top of the hill, what is the normal force (using the negative sign for the downward...

Homework Statement let a=360.9±0.1, let b=180.4±0.1, let c=212.5±0.13 and let d=211.7±0.16 whats f (including uncertainty) where f-1 = ((a/b)-1)/((c/d)-1) Homework Equations add the percentage uncertainties in quadrature if dividing two variables add the absolute uncertainties...

I have a homework problem which asks me to compute the second and third excited states of the harmonic oscillator. The function we must compute involves taking the ladder operator to the n-power. My question is this: because the ladder operator appears as so, -ip + mwx, and because I am using it...

Homework Statement Solve for n in the following equations: n-2\mid n^{2}-n+3 Homework Equations The Attempt at a Solution Should i use the euclidean division to solve it? Thank you before hand. Edit: When i used euclidean division i got n+1 and a remainder of 5 but i don't know how to get n.

Homework Statement (i) What is the strength and direction of the force per unit length acting on a straight conductor carrying an electrical current, I, in a magnetic field, B? (ii) The figure below shows a square frame of aluminium set at an angle θ to the direction of a strong static...

Homework Statement Bobo, Coco, and 8 other students are arranged to sit in 2 rows of 5 students. If these 10 students take their seat randomly, find the probability that Bobo and Coco are sitting in the same row but not next to each other. The Attempt at a Solution Bobo and Coco...

Homework Statement A uniformly charged wire or radius R1=0.02m runs down the axis of a cylinder of inner radius R2=0.06m. The potential difference between the wire and cylinder is 60 volts. Find the electric field at the surface of the wire. Homework Equations Electric flux=Q/\epsilon0...

Homework Statement Moe measure the length of his spaceship as 350 m. Joe observes this spaceship as it flies by his position and measures that it took 0.700 s to pass through. What is the speed of the spaceship? l': the length of the spaceship as measured by MOE = 350m t: the time as...

Homework Statement two equal charges repel one another with a f = 4.0x 10^-4N when they are 10cm apart. If they are moved until the separation is 5.0 cm, the repulsive force is... Homework Equations f= kq1q2/r^2 The Attempt at a Solution I already calculated and I just would like someone...

I was trying to solve out this problem for homework and I came to the answer of all of them being false because they all went to infinity...but I have a gut feeling that this is wrong.

Homework Statement Two cylindrical pipes both carry an ideal fluid (zero viscosity) in laminar flow. Pipe A has radius Ra = 2 and flow velocity Va = 8cm/s. Pipe B has radius Rb = 4cm and flow velocity Vb = 4cm/s. A) Calculate the cross section of pipe A and pipe B. B) Calculate the rate of...

Homework Statement It`s not to calculate, actually, I am just trying to understand this. I think it has to do with Archimedes Principle, but could anyone explain the following more clearer to me? "It`s observed that as bubbles rise in a deep column of water, the diameter of the bubbles...

Homework Statement A horizontal truss, symmetric around its center, of mass 15,000 kg and total length 22m, is placed on two posts as shown in the figure Find the downward force that it exerts on each post. Homework Equations The Attempt at a Solution do i just take the force...

Homework Statement If Sin(u)=\frac{\sqrt{2}}{2} and cos(v)=\frac{4}{5} and 0≤ u ≤\frac{∏}{2} and \frac{3∏}{2}≤ v ≤ 2∏ find cos (u+v) The Attempt at a Solution cos(u)=\frac{\sqrt{2}}{2} and cos(v)=\frac{4}{5} Do I just add them together? I feel like I'm missing something, but maybe the...

PROBLEM The problem models a theme park ride similar to the 'Tower of Terror' or Drop Tower (photo below) http://www.zamperla.com/uploads/product/big/Prodotti/tower-rides/flashtower_main.jpg The carriage mass is 1532kg and carries a maximum number of 8 riders with an average of 75kg per...

Not homework, just trying to learn how to solve this problem for an exam. Homework Statement https://dl.dropbox.com/u/23889576/Screenshots/10.png Homework Equations \int_{a}^{b} \sqrt { (\frac{dr}{dθ})^2 + r^2 }\, dθ The Attempt at a Solution Had much difficulty, could not...

This is not homework but a problem I would like to learn to solve before my exam. Homework Statement https://dl.dropbox.com/u/23889576/Screenshots/01.png Homework Equations Series Formulae The Attempt at a Solution I went about trying to determine a sum formula for the fly's...

Homework Statement How do you do a convolution of two functions containing only impulses? Homework Equations Say you have 2 functions to convolve, f1 and f2. I can't do the impulse symbol, so let's call it q. Say f1 = 2q(t+1) + 2q(t-4) and f2 = q(t-3) What is f1 convolved with f2? Or how...

Homework Statement Part B Homework Equations Thermodynamics, Carnot cycle, ts diagram The Attempt at a Solution I understand that for figure A, Qh=T1Δs and Qc=(T1-T2)Δs once you take the negative out of the Δs. For figure B, Qh=(T2-T1)Δs and Qc=-T2Δs once you take the negative...

Alright everybody, I REALLY need help on this and I only have a limited time. So I took a video of a model rocket and using the video analysis software, Tracker, I have a graph of position vs. time. Now I don't know calculus yet (only in pre-calc as of now), so the derivation of the graph won't...

Hello, So I'm in my last semester at my local community college and I'm taking Modern Physics. The class is cool and all, but the material is very hard to grasp. Furthermore the homework questions, (to me), are nearly impossible to complete. It takes me close to thirty minutes just to...

TO EVERYBODY, THIS IS NOT MY HOMEWORK. I HAVE A TEST TOM and these are some questions that I just don't know how to do, I gave attempts to some and some I am just missing something. Plus, these questions are from all over the unit so its not my homework. I need it done asap. So then I know how...

Homework Statement http://img39.imageshack.us/img39/6669/wileyplus.png The field is conservative. With their description of C, and using the Fundamental Theorem of Calculus for Line Integrals, would you evaluate f(11/sqrt(2), 11/sqrt(2)) - f(0,0) or f(11/sqrt(2)...

Homework Statement You are assigned the task of working with a desk-top sized magnetic spectrometer for the purpose of measuring the ratio of C12 to C14 atoms in a sample in order to determine its age.* For this problem, let's concentrate on the magnet that will perform the separation of...