Homework Help

Hi guys, i was wondering if you could give some help here is the question: The Electroscope 3.bring the charged rod near the scope then touch the ball with your finger, withdraw the rod and your finger. a) what happend ? Explain i said this: the 2 foils repelled because the rod is negative and your ginfer gets extra negative electrons and 2 negative charges repel. (teacher wrote: partly correct)

We have to do worksheets, and they're very poorly made. The questions and answers only have a vague connection with the material in the books. So... can you wonderful people help me out? 34. Clean up of contaminated soils is done by... a) washing it with detergent b) burning it c) injecting microorganisms into the soil to "eat" the organisms d) all of the above e) none of the above The first two sound ridiculous, and if it's none of those two it can't be D, so I'm leaning towards either E or C. Probably E since none of the other answers are E, but C sounds plausible enough. Not that I'd know since the book doesn't seem to answer this. 37. Which of the fol…

rule 1) No we will not do your homework for you, the hard work will be good for you and it will turn you into a better person. rule 2) Do not then go on to spam all the other forums with your homework requests, one post here will do, and it will probably get read. rule 3)Not all questions have answers! teachers give questions to make you think, so think. your brain is the result of several million years of evolution, apprecialte it and use it. rule 4) Be Grateful.

Does any1 know whether ethanol is an water-immiscible organic solvent?

I am currently doing a projext on static electricty and I want it to be the best. Does anyone have any suggestions as to which materials are the best for picking up things like human and animal hair?

with this question, I'm told that i shouldn't be getting any decimal answers becuase the answer is in the number of photons...so can any1 just tell me whether you agree with my answer? A ruby laser produces radiation of wavelength 633nm in pulses of 1.00e-9 s duration. If the laser produces 1.68e-16J of energy per pulse, how many protons are produced in each pulse? i keep getting an answer of 535.46827.... which i think is approx. 535 photons. what do you guys think?

Why is ammonia volatile? Also, why is silver nitrate AgNO3 and sodium chloride NaCl non-volatile? I also don't understand the relationship between the volatile nature of a solid and the boiling point elevation? Much appreciated for help

hey guys, i have 2 questions...hopefully u can help me out! 1. this multiple choice MAY have more than 1 answers...but i only got 1 answer so i just want to know whether u guys think there's only 1 answer as well. Which of the following statements is/are incorrect? (a) The exact momentum and position of an electron cannot be determined. (b) Lower energy orbitals are filled with electrons before higher energy orbitals. © When filling orbitals of equal energy, 2 electrons will occupy the same orbital before filling a new orbital. (d) No two electrons in a particular atom can have the same value for all 4 quantum numbers. (i got © as the incorrect statemen…

hey can any1 confirm my answer? A hydrogen atom in its ground state absorbs a proton of wavelength 121.5nm. To which higher energy state will it be excited? (a) n=2 (b) n=3 © n=4 (d) n=5 (the answer i got was n = 1.15 so roughly n= 1, using bohr's equation and E = hc/wavelength. but that doesn't match any of the multiple choice answers on the worksheet. wat do u guys think?)

Hey all, yet another question Suppose an → a, bn → b and an ≤ bn ultimately. Prove that a ≤ b. i am not sure how to do this.... if anyone has some advice or could show me how, it would be greatly appriciated Sarah

This isn't my homework (except no.3) but I'm wondering... 1. if there was a particle in the EXACT middle of two gigantic stars, then would the particle keep disuniting due to the gravity? 2. What is the name of the theory that states in a long enough period, the axioms/laws of physics will change? 3. In sense of static electricity, what does the wool do to the balloon when rubbed?

just a quick phys question A wheel mounted on an axis that is not frictionless is initially at rest. A constant external torque of 50 N . m is applied to the wheel for 20 s, giving the wheel an angular velocity of 600 rev/min. The external torque is then re-moved, and the wheel comes to rest 120 s later. Find (a) the moment of inertia of the wheel, and (b) the frictional torque, which is assumed to be constant. and i get (sorry don't have time to write out complete working) a) 60/pi kg.m^2 b) 10 N.m is wrong or right? lol Sarah

Hi guys I feel pretty dodgy having my first post in the homework forum, but i've done my share of lurking dammit, i've lurked my little heart out, and now i need some help The question is for a prac in molecular biology. Q1) Imagine that a pair of primers amplify more fragments than the desired one. Which program parameters woudl you modify to suppress this? Would you increase or decrease thier values? I have absolutely no idea. I searched for ages through the textbook and online. I'm assumming prgram parameters that can be increased or decreased are either times or temperatures of the denature, renature and expansion phases? Only information i found w…

hey guys, i have a few problems which i'm not too sure about...hopefully u guys can help me out! 1. A hydrogen atom in its ground state absorbs a photon of wavelength 121.5nm. To which higher energy state will it be excited? a) n=2 b) n=3 c) n=4 d) n=5 (i used E = hc/wavelength to find te energy, which then i made it equal to deltaE = -2.18 x 10^-18 [1/(n final squared) - 1/(n initial squared)] where n initial is 0 because it is in ground state. The answer i got was n = 1.15...which doesn't match any of the choices...can any1 give me some help?) 2. Which of the following molecules has a nonlinear structure? a) XeF2 b) BeCl2 c) O3 d) CO2 e) N20 (central atom…

I am doing a paper for bio class on the brains of birde, parrots and crows in particular. I have tried google and google scholar, neither has helped much so far. Does anyone have links related to this subject? I would appreciate any and all. thank you.

In the figure, describe the motion of particles X and Y at the instant. What will be the shape of the string after 1/4 cycle? I don't know which direction that the crests are travelling as there are two sources.

If a wave passed from a shallower region into a deeper region, will its amplitude increase?

Here are four questions that I need help on.. I really can't think much.. Thank you very much for your help! 1.What unique ability to bacteria posses in regards to gaining additional DNA? My answer: All cells are clones of each other, and all cells respond to environment in same way. 2. In the lab on simple staining, we pass the slide with bacteria through the fire. What was the purpose of it? My answer: Since we want to observe the bacteria in the stain, we want to do it when it's killed --> and flame kills it. 3. In the lab on simple staining, some of the stain remain on the slide while the slide was rinsed. Why? My answer: Some of the st…

lol i am having more trouble.... there is always 1 or 2 question i can't do and it drives me nuts!!! well the one this time is.... A function g has the property that lim x→∞ xg(x) = L. Prove that lim x→∞ g(x) = 0. i have never done or been shown how to do a proof like this one and i am compltely lost Sarah

hey can anyone help me do this problem? Prove using the formal definition of limit lim x→1 √ x = 1 Thanks and cheers Sarah

hey quick question for part d) of this question..... i am not sure of the answer but i think i know the rest of it...

hey just a quick question.... if i have to Write down an expression for the x and y components of the gravitational force on an object (1) of mass M1 by an object of mass M2 when object 1 is at a position (x1,y1) and object 2 is at position (x2,y2). is it correct to say

I have got a Maths project coming up and I would appreciate it if any one could give me some ideas or if possible some links . i was thinkingmaybe doing it on probability of genetics but i cant find info anywhere. genetics. The project has to be 50 pages of booklet and a model if possible,. PLZ HELp

how do i prove by contradiction that the sum of two irrational numbers is irrational? lol i just can't quite see the trick yet Cheers Sarah

my problems is i got stuck while i was trying to find the domains of a function, 1) f(x)=(x^3)-(3x^2)+(2x)+5 2) g(x)=(x^2)+5/(x+2) can anyone determine the domain of the two functions? Thanks a lot!