Homework Help

A room (8 m X 6 m X 4 m (height)) with hard sound reflecting surfaces is to be decorated for meeting purpose. The reverberation time is measured and found to be 3 seconds in a particular octave band. Calculate how much extra sound absorption must be provided to reduce the reverberation time to 0.8 s, that is suitable for speech and discussion. Assume that a carpet is added on the entire floor with the value of absorption coefficient = 0.2 in the same band and sound absorbing panels are added to cover areas of the wall and ceiling with the value of absorption coefficient= 0.4. What is the area for these panels required? You may assume that the absorption coefficient of t…

Recently my school made a science competition and it is compulsory for everyone to enter it. I and my group decide to enter the competition as a physic project. Yet, we have tried on so many projects. But it seems there is not a thing that work out

Recently my school made a science competition and it is compulsory for everyone to enter it. I and my group decide to enter the competition as a physic project. Yet, we have tried on so many projects. But it seems there is not a thing that work out

I have to synthesize a made-up molecule from a simple starting compound (preferably 3 carbons or less). My professor will know if I copy-paste a synthesis from online, so that definitely wouldn't fly. In order for me to get the maximum number of points, the synthesis must meet the following criteria: 1) There must be 4-8 steps (protonations and deprotonations not counting) 2) I must use reagents that we learned in both Organic 1 and 2. We can’t use anything we haven’t learned yet. NO DIELS-ALDER ALLOWED FOR CYCLIZATION, THE ONLY WAY WE HAVE LEARNED IS INTRAMOLECULAR SN2.) Here’s everything I have learned so far this semester: 3…

I'm doing a lab and I can't quite grasp what type of chemical reaction occurs when copper and oxygen come together. Is it a synthesis reaction or a single displacement? I'm really confused with the logic and would appreciate some guidance.

it prevents the egg from breaking because the sides of the egg is protected by the sponge and if you put it into a container it should be evenly covered with thick sponges. Does this work? Because I don't want to fail science again.

The same intensity of blue (450-495 nm), green (495-570 nm), yellow (500-730 nm), red (620-730 nm) and white colored lights fall on identical yellow surfaces in the same environment. Which of these surfaces will be the warmest after a while?

Hello all. Recently I have read the article: 'A. Agrawa, D. Lokshtanov, S. Saurabh and M. Zehavi. Split Contraction: The Untold Story'. I am interested in the theorem from the article. The theorem statement can be stated as: «SRBPC parameterized by the number of parts in R is W[1]-hard». I did not understand what is Split Contraction, SRBPC, Perfect Code and W[1]-hard. Could you please explain it easier for me? And I need explanation the proof of the theorem. As I understood, the theorem proofs through some Lemmas. And I ask you to explain for me these lemmas easier. Thanks.

Hello everyone! I'm a new member and this is my first time posting here for help. I have an assignment where I have been given MALDI-TOF data for an apomyoglobin standard and a thrombin digested GST tagged of an unknown protein. I am having trouble identifying the peak indicated with a question mark in the standard data. So far, I have identified the middle peak in the thrombin digested protein as GST, while the first peak (11499.1) as the unknown, which I would be analysing with bioinformatic methods. I would really appreciate it if someone could help me or rather give me information as to how to identify the remaining peaks in both datas. THANK YOU for reading!

Determine the mass in grams of lead (II) iodide that will dissolve in 500.0 mL of a solution containing 1.03 grams of lead (II) nitrate. Ksp of lead (II) iodide is 1.4 x 10-8. 1.03 g x mol = .00622 mol ------ ------ ------------- 0.5 L 331.2 L PbI2 (s) ==> PbI2(aq) ==>Pb2+ + 2I- .00622 2x^2 (.00622)(2x)^2=1.4 x 10^-8 x = 7.5 x 10^-4 M 7.5 x 10^-4 m/L x .5 L x 461.01 g/mole = .173 g

How can one prove that the addition of the Grignard reagent to the carbonyl compound proceeds through a six-membered ring transition state?

Hello everyone! So I'm an English major and I have trouble writing compare and contrast papers. I have a hard time writing these kinds of essays because my classes are mostly cultural studies and critical theory, so I'm used to more complicated ideas. Compare and contrast essays usually cause me to overthink, and I end up getting lost. That is the main reason why I start to think about using online writing service. Lots of my friends use Primewriting site a lot when they want a paper from the scratch or having a work edited or proofread. What do you guys think about it? Have you ever used this kind of help? Should I also turn to the writers from Primewriting site and lea…

For my school we have this whole model where we have an extra class to accommodate people who go off campus usually every other week and we have to make an experiment for our chemistry grade. The teacher I have is an AP Environmental Science teacher and she grades hard. Last semester we got a 79 and that was a good grade apparently, and we haven’t even started our experiment yet. Our research is based around the school itself which is environmentally conscious, and we have to do an experiment on soil pollution around the building. I seriously have to start the experiment this week, in the next few days because it has this is ‘supposed’ to be presented on the 30th of April…

Assume a hydrogen atom in the ground state. Observe the energy diagram of the electronic levels for the hydrogen atom and judge the following items: I. The atom can absorb any form of energy, but not any amount of energy. II. If an electron receiving energy goes into an excited state, returning to its ground state can release any form of energy. III. The atom can absorb a photon of 10.2 eV, but can not absorb a photon with 11 eV. IV. An electron with an energy of 11 eV can, after collision with the atom in question, transfer part of its energy by exciting the hydrogen atom. V. An electron with energy of 10 eV can, after collision with the atom in question, tr…

Consider 2 electronic transitions below: 1) Electron 1s jump for 2s 2) Electron 1s jumps to 2p By calling I, II and III the set of the two electronic transitions mentioned above for the atoms of (1 subscript)H, (3 subscript)Li, (4 subscript)Be, respectively, we can state that: a) In I, the two transitions absorb the same energy. b) In II, the two transitions absorb the same energy. c) In III, the two transitions absorb the same energy. d) The second transition in II absorbs the same energy as the 2nd transition in III. e) The second transition in II absorbs more energy than the 2nd transition in III.

Consider the following statements: I - As structural species NH3 and Na+ are said isoelectronic. Given: (7 subscript)N, (1subscript)H, (11 subscript)Na. II - The formation of the cathode rays is due to the process of ionization of the residual gas inside the ampoule. III - In the atomic model of Thomson, matter is neutral by a simple fact of finding the electrons in a positive noodle in a region called the electrosphere. Which one (s) of the statement (s) are (are) correct? Justify correcting the wrong alternatives.

Hey, I'm at college and for one of my units, I need people to complete a survey on the publics perceptions of science - https://www.surveymonkey.co.uk/r/YD8ZHKY I would really appreciate it if you could take a few minutes of your time to help me out and complete the survey. Thanks in advance - James

Hi, I've been pulling my hair out trying to solve this. If we treat it as a series similar to proof by induction it can be simplified. Am I on the right track. But the LHS doesn't appear to factorize and reduce in any easy way! 2017-10-24.pdf

Does anyone know what is resonant weapon and how it is used? this is for my lectures in english science. i have to find someone who knows what is a resonant weapon and explain to me. i will be very greatfull if someone can help me.

An athlete with a mass of 62 kg jumps and lands on the ground on his feet. Th e ground exerts a total force of 1.1 x 10 ^ 3 N [backward 55°up] on his feet. Calculate the acceleration of the athlete.

I'm trying to find a history on Tethonite and I'm having trouble. Can anyone direct me to a website with info that is not Tethon3D?

Is there any evidence that the big bang has happened more than once? Are there any reasons why not ??

The asthenosphere lies in the: 1. inner and outer core 2. mantle and crust 3. crust only 4. mantle only 5. outer core only A subduction zone is often created when: 1. Oceanic crust pulls apart from oceanic crust …

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Hello, I am currently working on a practice exam question, and my professor has provided the answers, but no solutions for how to get to the answer. I would like to ask if anyone could help me understand this problem step by step or with hints so that I could possibly do problems similar to it in the future. An explanation of what direct mapped and 2-way set associative would also be much appreciated. In addition, what each header in the tables stand and are used for (i.e. V, tag, LRU, etc.). I am very lost in this problem and have no idea of what to do. Thank you.