Homework Help

1. the base of a solid is the region in the xy plane bounded by the parabolas y=x^2 ans x=^y2. find the volume of the solid if every cross section perpendicular to the x-axis is a square with its base in the xy plane. 2. given y=x^5 - 4x^3 + 5x a. locate the exact or approximate intercepts b. identify any axis of symmetry c. determine the curves behavior at positive and negative infinity d. use the first and second derivative to locate turning points 3. find the area common to r=1+cos@ and r=3^(1/2) sin@ 4. specify the points of intersection of rcos@=1 and r=4cos@ 5. tnagents are drawn to the ellipse x^2/a^2 + y^2/b^2 =1 and the circle x^2 + y^…

Can someone please help me... I have been asked this question, "If it took 5500L of caustic to go from pH 10 to 11 how much is needed to go from 5 to 6?" and I answered 0.055L but i have been told that is wrong. Can someone please explain what the answer is. Thanks guys:D

Hello everybody! I have to answer a really easy question, but I just cannot find the information anywhere! What does the "H" in buffer H (a buffer for restriction enzymes) stands for? Could you please help me out? or tell me where I could find the information?

Hi guys Haven't posted in this forum for a long long time.. good to read over some more interesting stuff on here i havent had the time to for a long long time.. anyway here goes Dynamics (mechanical engineering) gave me this assignment question which is more of a study question for our final exam (because it doesn't count towards our marks) Here is the question: A thin ring and a circular disc, each of mass 'm' and radius 'R', are released from rest on an inclined surface and allowed to roll a distance 'D'. Determine the ratio of the times required. I firstly drew my FBD (free body diagram) and this is it: (take a close look at the direction of my fric…

Hi, I have a homework about productivity.. I have to find how productivity is auction in a factory or in a company. I found something about it. But they are not enough. If you help me I'll be pleased.. Thanks a lot. I can not speak English very well. So if I have a mistake I'm sorry..

What are Amino Acids?

Okay, I am completely stuck. I have a homework question that I just can't manage to find the right approach for. I know what I should do if I solve it manually, though it's a long process, but I can't manage to build the function, and I really -- really really -- need help. Quite urgently, actually. It's due tomorrow. I've been trying this for the entire day already. The sad thing is that the solution is probably quite easy, and I am going to feel really stupid but I'm going to risk it. The problem is this: Now. I am thinking that I need to do this in stages, so I have my representations of a, b, c and d:[math]a=(bx^2+cx+d-y)/x^3[/math] [math] b=(ax^3+…

hey guys, im doing my senior chemistry research project on the "chemistry of carcinogens in diesel exhaust". i've found lots of reports on this subject, but was wondering if anyone had any websites which i could find chemical equations and reactions in (as this is the point point of the project - the chemistry of...)??? Or any useful information would be greatly appreciated!! thankyou

Hi everyone, Just started my A-level in biology and am confused about how DNA replicates Unfortunately what I have been taught seems to go against the biology I previously learnt from GCSE- e.g. is DNA not found in the nucleus after all? Any help would be appreciated Cheers

What Evidence Suggests That Earth Was Once Molten? Thanks in Advance!

A bug lands on the top of a bald man's head (sphere shaped). It begins to slide off. (no friction). Prove that the bug falls off the man's head at a height that is 1/3 the radius. MY attempt at the solution Fnet = N - mg, N = (mV^2)/R - mg (because acceleration is centripeital) When the bug falls, the normal force equals zero, so (mV^2)/R = mg V^2 = gR V^2 = Vi^2 + 2gh V^2 = 0 + 2gh KE = 1/2 mV^2 so, KE = 1/2m(2gh) KE = 1/2 mV^2 = 1/2m(2gh) V^2 = gR so 1/2 m*gR = 1/2m(2gh) R = 2h or h = 1/2*R THe answer should be h = 1/3 * R What about my approach is incorrect? i'm essentially finding two different ways…

i need to make up a real ecosystem for my environmental science assignment. I have no idea on where to begin from.. can anyone smart overhere help me out ? btw if u dont know what an ecosystem is, then here is the definition: An ecosystem is a natural unit consisting of all plants, animals and micro-organisms in an area functioning together with all the non-living physical factors of the environment.

Hello All: I have a major homework issue and your help would be greatly appreciated. Here's the question: In what ways does volcanic eruptions and earthquakes affect global climate? Thanks.

Well, I have all summer to prepare for calculus based physics in the fall. I started last night and I've already come upon a problem. I'll just use this thread to ask questions instead of making 100 of them throughout the summer. Any help is appreciated. The problem is: A man throws a ball horizontally such that the ball leaves 1.5m above the ground. At what velocity must the ball leave his hand so that it reaches a point 20m away without touching the ground before it gets to that point? I got that the initial velocity in the y-direction is 0, which allowed me to find t. But that still leaves acceleration in the x direction and initial velocity in the x direction …

Why should we take notes during lecture in class?

Hello there. Im writing a paper for my Psychology of Sexuality class, about Extradyadic sex. Ive found 2 sources, but I need at least 2 more. Im looking for psychology journals. I have the ability to search through a database of journals, but I cant seem to find articles Im looking for. and when I do type in "Extradyadic" or "Extramarital" I'll get a few things that arent related to what Im going to write about. Im writing about why women and men may become involved in extramarital affairs. I need some search ideas. Also, if I could find some information on "Key Parties" or a "Key Party" that would be good too - because Im going to mention that as wel…

I have these two questions left to answer in an online TIMED quiz right now, and have no idea how to solve them. I've searched all through my text and notes and can't find anything. ANy help would be really appreciated! In a calibration experiment, a 1.04 millimole sample of Na2CO3 gave 0.82 millimoles of CO2 gas. If a 0.346 g of pure Na2CO3 was reacted with excess acid, what volume of gas will be measured on this apparatus (in Litres at STP)? (Hint: Start by calculating the percent yield) The antacid in question (with an active ingredient of Ca(HCO3)2), upon treatment with excess hydrochloric acid, a 0.433 g sample gives 88.15 mL of CO2 at 25.00oC and 1.000 atm. …

Theres a straight line (l) and a polar co-ord of a point A (p, alpha). The straight line passes through A and is perpendicular to OA. Ive got to prove rcos(theta - alpha) = p Any ideas where to start with this. I've got y = tan(alpha)x for OA.

What are RFLP,and what are their importance in genome analysis?

I'm not sure if theoretical physics is exactly what one would call it, but i think it describes it pretty well. The first one I'm stuck on is explaining why the EEP leads to a conc lusion that a localized mass must curve space around it. Any help is appreciated.

Okay, I know I got close to this but then I am not sure. Any help is appreciated: Here is the problem: There is a string of pearls, which has 33 pearls on it. The largest and most expensive one is in the middle. The string of pearl is worth $65,000. Starting from one end, each pearl is worth $100 more than the one before, up to the middle. Starting from the other end, each pearl is worth $150 more than the one before, up to the middle. What is the value of the middle pearl?

Hi all. In a plain solution of table salt, left for years undisturbed in a closed jar; which ions will be more abundant (precipitate) at the bottom - Cl or Na ? Miguel

1. Just in general? 2. In chemical properties? Thanks in advance!

Does anyone know how to conjugate the Latin verb "descere"? I know it's from the 3rd group, and I know it's a replicative. I just get a bit confused with it. Does the stem only change to the replicative form in the perfect tense or what?

Can anyone tell me how to use IR to differentiate two structurally similar compounds that have the same substituents but placed at different locations on the compound like o-nitrophenol and p-nitrophenol.