Homework Help

So the question is horribly vague and we were told to, by any means, figure it out. I'm begging all of you, to put me out of my misery here. --- A ball is thrown up into the air at an upward velocity of 25m/s, consequently, a ball is thrown down towards the ground from a building 15 meters high. At what point do the two balls meet, and (I'm assuming here) at what hieght? --- Again, no details were given in reference to the force thrown, or displacement. Say the ball dropped from the building has an initial velocity of 0m/s to make things a bit easier. And say we don't take into consideration how tall the person throwing the ball is. That it is, myster…

How would a decrease in precipitation affect the supply of ground water in your region? Thanks in advance!

I have two ambiguous questions that I could not understand from my worksheet other day in physics class. I was wondering if my answers were right so please help me. (I do not remember exact wording) 1. I'm traveling south with my boat 3 m/s relative to the river. The river's flowing east 2 m/s relative to the shore. Then my vector relative to the shore will a) slightly decrease b) slightly increase c) no change I put B because I thought that, "Hey, this sounds like Pythagorean Relationship" but I'm not sure. 2. When adding vectors, the length and direction of each vector must be a) similar to the that of resultant vector b) not changed c) rever…

New to the forums. Any help anyone can give would be great. Thanks The enzyme carbonic anhydrase is found in erythrocytes, and has a molecular mass of approximately 30000 Da. The hydration reaction catalyzed by this enzyme is reversible, and plays a role in the transport of CO2 from the tissues to the lungs. H2O + CO2 <-> H2CO3 If 10 micrograms of pure enzyme catalyzes the hydration of 0.30 g of Co2 in 1 minute, at 37 degrees Celsius, under optimal conditions, what is the turnover number (kcat) for carbonic anhydrase?

I need some help on facts anyone out there with some facts please contribute cheers

Hi I'm doing a project on DNA fingerprinting for my XI finals .Could you tell me of some good sites I could look up on the net?Names of a few books would also be great help (but I'm not sure I can get my hands on them) Thanks

Hi everyone, i have an essay to do on HOW DOES PHYSICS RELATE TO MATH i need a little help to start the essay i dont know where to start it from and what to write in it CAN ANYONE PLEASE HELPPP MEEEEE Thanx, Uzair

Hi Guys, Just started teaching myself FP2 from home so I might end up with a lot of these.... anyway im trying to integrate sin5xcos2x dx but am running out of ideas. Ive tried to get everything into 2x's but each time I end up with something wierd. Any ideas?

Hi guys! I have a major homework issue and would appreciate help. Here's the question: "How do rockets work in space where there is no oxygen for burning?" It's a research homework so answers would be loved. Thanks.

1. Which of the following are examples of applied science? movies eyeglasses contact lenses all of the above 2. Physical science is the study of? matter and energy matter and electricity mass and energy matter and applied science 3. The practical use scientific information is? physical science pure science technology applied science 4. Which of the main categories of science deals with space? life science earth science physical science applied science 5. ____________________ is a situation in which something appears to be missing. problem theory observation hypothesis 6. A _______________ is an idea that represents whateve…

Hi everyone, the math prob is: Thw world's fastest roller coster is at six flags magic mountain. At the start, riders are shot forward and then up a tower. Then they begin the backward decent. The cars reach a speed of 160 KM/Hr in 7 seconds during the desent. From a point 100 meters from a foot of tower, the angle of elivation of the top of the tower is 52'(degrees) find the height of the tower to the nearest meter. I dont know what formula should i use to solve the prob, can anyone please help me with that. Thanx, Uzair

Let C be the closed curve that goes along straight lines from (0,0,0) to (1,0,1) to (1,1,1) to (0,1,0) and back to (0,0,0). Let F be the vector field [tex]F = (x^2 + y^2 + z^2) i + (xy + xz + yz) j + (x + y + z)k. Find \int F \cdot dr[/tex] By Stokes Theorem, I know that I can transform this into a curl (instructions say don't evaluate the line integral directly). So I know I get a form of square that goes CCW. Projected on the xz-plane, it is simply a square (but the y-coordinate of the right end is 1). I think the plane is described by x = z, since there is no dependence on y. So x-z = 0 Anyways, I take the curl of F to get [tex]F \cdot dr = (1-x-y)…

And what are the purposes of doing tests with reagents?

I understand how we see black and white. It has to do with the on/off functions on the bi-polar retinal cells. But how do we see gray. This isnt really a homework question, but a thought question that was given to us my our professor. I am assuming it has to do with the fact that the on bipolar is not ALWAYS on and the off and not ALWAYS off, so sometime there will be two off or two on. let me know if im correct or close, or totally off. Any help would be greatly appreciated. Thanks for the help in advance Alex

Google's been giving me some pretty vague results on this subject.... I have to write a report on one the the elements (for me, lithium), and I decided I'd do a little extra and have a little section on plasma. However, we've never covered it, so I don't really know much about it. Does a gas become a plasma when an electrical current passes through it, or at a certain temperature? Both? Are all the electron shells stripped of electrons, or just some? At what point does lithium become a ionized/recombine? Is that even possible? Thanks a lot. =) PS- I'm talking specifically about 7^Li, but 6^Li is stable so I guess that could work for an answer. …

Hi guys I really am not about to givebackground or anything like that but heres the prob! 2 - -5 +3 2nd power (3 to the 2nd) Not sure how you all do that here I'm new and Im learning to really love math but I cant figure this out!!! I suck...

Im working on a lab right now where we are comparing the NO2 anion, NO2 cation and NO2 neutral. We have been asked to draw Lewis Structures for all three and the anion and cation are no problem but the neutral molecule no matter how hard I try there is no where to really fit the last electron, not nicely anyways.I would really appreciate being pointed in the right direction Thank you.

cx - 3 = (c^2)(x^3) - 3 Solve for c as x approaches 2. Where do I start?

The question is in the attachment. (Sorry I have difficulty typing organic compound structural formula. ) Sorry for the trouble and thanks for your kind attention and patience.

Hello, I'm charlie and I need help with a physics graph. The graph's axes are average time and average acceleration. there are oly two points on the graph. After the average time .7 seconds the average acceleration is 6.13 m/s squared. Then after 1.36 seconds, the average accel. is negative 5.79m/s squared. The thing I need help with is that I don't know how many quadrants this graph will take or if it goes into the negatives. Lastly, It would be informative if someone could tell me what a change in average accel. is called Thanks in advance:D please:confused:

Hello all, Posted this in the 'Relativity' section but no takers..may be a little elementary for that folder, perhaps someone could help here..: 'ABC of Relativity by Bertrand Russell - A layman strikes..' Hope someone can help with my understanding of a part of this book. Train is travelling at 3/5 the speed of light and passes a stationary observer at a point which an event in the direction of the train occurs - "An event which happens in the forward direction along the railway, and which the stationary observer judges to be now (or rather will judge to have been now when he comes to know of it) if it occurs at a distance along the line which light could tra…

Provide three examples of how different neurotransmitter receptors can combine to generate different EPSPs. Where would i find this, and also an example with an experiment of some sort would be nice.. Thanks in advance

please help me with this.. There are 3 noncongruent cirles the distance between their centers are 21,23 and 25.. Find the area of the shaded region.. please d0 help me..

Okay, I'm a 10th grade student in biology honors and need a science fair idea. It has to be something measurable, not just like a research paper, I have a few ideas but they are boring. I really want to do something with animals, but it cant be like injecting them with any thing, more like behavior. And it is okay that we use animals in our schools rules. If you guys have any ideas even just like a question that could be answerd, insperation if you will, please please post, even if you dont think it is any good I may have never herd of doing it before. Thanks a bundle.

I am doing a Biology lab on dissolved oxygen in water, etc. etc. Mammals use about 1-2% of their energy breathing, while fish must spend about 15% of their energy moving water through gills for THEIR energy. Why the huge gap?!