Homework Help

hi guys, i have been trying to figure out this question for days now i think its a case of wrong formulas but im not entirly sure, so any help would be gratly appreciated! i have been told that monochromatic light from a laser is directed towards a diffraction grating with 300 lines per millimetre. A diffraction pattern on a screen situated beyond the grating consists of a series of spots of light. The first order spot (d) is situated 2.00m (200mm) from the centre of the grating, at a diffraction angle of 11.8 degrees, assume that the speed of light is 3.0x10^8 m s-1. the questions are......... 1) calculate the distance (s) (in mm) from the centre of the …

Hi all, Question: how would you start to approximate the costs of gene knockout experiments? I am doing a class project where I am writing a research grant proposal. My proposal involves using gene knockouts to validate malarial drug targets. (The steps include: take plasmid vectors, insert stuff using restriction enzymes, transfect into malaria, screen using southern blotting) The problem is that I am actually mostly a computational researcher. So I have no idea about how people practically buy and use these experimental items. For example, I assume there are gene knockout kits???....how do you choose which kit to buy???....how many kits do you need…

How would i Figure out this question? A skydiver steps out of a helicopter hovering thousands of metres above ground. After 3.5 s of free fall the skydiver pulls the rip cord. What is the skydivers displacement during the 3.5 s of free fall? Please tell me step by step because i have tried everything to get this awnser and i cant get it thank you in advance!!

Hello, I am a student at College of DuPage in the process of completing an introductory earth science course. One of my course requirements is to interview a research scientist in the earth sciences and to produce a biography of that scientist as well as a synopsis of his or her research. I would greatly appreciate your responses to the following questions at your earliest convenience. 1. What was your initial motivation to enter your field of expertise? 2. What academic and/or professional preparation was required to lead to your present position? 3. What do you enjoy the most about your work? 4. What do you enjoy the least about your work? 5. What would be th…

Im kinda confused from the lesson I had today, is there a difference between Hydrogen and Hydrogen gas? And also, what are oxidants?

I'm doing a science case study on genetically modifying animals, and I'm meant to get opinions. So what is your opinion on whether genetically modifying animals should be allowed? Thanks

Hey everyone, just wondering, for the isotopes of Hydrogen, what are they used for? I need this for a report. Thanks in advance! Isotopes of Hydrogen Protium Deuterium Tritium

hey this a science project what is called when an experiment is illegal or you cant do it because it is inhuman. Like isolation or different types of torture??

I wanted to find out how much food energy it would take to run a car. Thought experiment: Starting from a stop, a 1000 kg car goes 5 km in 5 min. How many 2 oz. Snickers bars does it take to provide this energy? 5 min. = 300 s 5 km = 5000 m so velocity = ~17 m/s Energy = E(final) - E(initial) = (1/2 * mv^2) - 0 = 1/2*(1000 kg)(17 m/s)^2 = 289,000 kg (m/s)^2 = 289,000 j so power requirement is: 289,000 j/s =289,000 W sustained over 300 sec, Energy = power * time =289,000 W * 300 s =8.67 * 10^7 j 1 calorie = 4.184 joules (8.67 * 10^7 j)/(4.184 j/cal) =2.07 * 10^7 cal 1000 cal = 1 kcal (2.07 * 10^7 cal)/(1000 …

A boulder with a mass of 2,500kg on a ledge 200m above the ground falls. What is the speed of the boulder just before it hits the ground. To find velocity you need to use the kinetic energy formula right? But when I tried to plug in everything, it wouldn't work. IT only looks as if the GPE formula would work... could someone help me please?

Hi, I've been set a whole load of homework of which I absolument null. I'm allowing myself to ask for help on this one question because I don't have a clue, have been searching online for aaages and can't find the answer. If I don't ask then I'll end up giving up and failing GCSE chemistry. I really need help, my passing is in your hands!!! There are four main methods of making salts: A Acid + metal B Acid + insoluble base C Acid + alkali D Solution of salt A + solution of salt B a. A student wanted to make some sodium sulfate. i. which method would be the best one to use? ii. why? iii. name the reactants you would use. iv. write a word equation for …

what is the formula for calculating the momentum of an object? i fully forgot.. is it P=mv? or did i just imagine that?

I dont understand how to do this so i need yalls help, Write the Correct Name of The Following Formulas: 1. Calcium Chlorine 2. Copper Sulfate 3. Nickel Oxide Im not goina ask for u guyz to do my home work but i would like some examples please

I have an assessment task requiring me to identify why "carbon instead of silicon, is the "building block of life". I have formulated a few ideas about this, such as, Carbon is better because in Earths premortial state (slime and whatnot) billions of years ago, the energy required to make carbon would have been less than that required to make silicon. This can be attributed to Carbon having a smaller nucleus, therefore, less protons, neutrons and electrons. And we all know that everything likes to have a low energy level to remain as stable as possible (which isn't to say that silicon has a higher energy level, as it has 4 valence electrons also, meaning similar propertie…

my chem teacher wasnts us to make batterys for projects but he doesn't want all patatoe and lime batterys. i was wondering if anyone on here knew of an interesting way to make a home made battery with the exceptions of things my teacher can aquire for the project.

hi guys Does anybody know what formula one would use to calculate how long it would take to raise the temperature of an area of x litres of air by blowing in y litres of warmer air . ie if I blow in air at 25 degrees C into an area which is at 20 degrees C , how long would it take to raise the temperature by one , two or three degrees? What I know is the volume of air (in litres) blowing in as well as the volume of air in the area (in litres) as well as the two different temperatures of both of these areas. Thanks guys:-)

okay im doing vectors and have no idea WHAT im doing. for example: add 5.0 m north to 3.0m west.. answer 5.8m n 31 degrees west. i dont understand how they got this answer. i know it has to do with resultant. can someone show me please

Hi, Anyone know where to buy gadgets similar to this article I read from http://futuristicstechnology.blogspot.com/search?q=KNEE+POWER Trying to look for ways to use kinetic energy to power my radio and recharge batteries

Can someone help me with my homwork that my Chemistry teacher set me? I know the formula of Sulphurous acid which is H2SO3, but I need to know exactly the structure of Sulphurous acid and its individual bondings between the hydrogen, sulphur and oxygen atoms. I would really appreciate it if someone can help me with this.

The fact that Earth observers always see teh same side of the Moon is explained by the Moon's (what) a. eclipse b. penumbra c. gravity d. synchronous rotation

Name 3 differences Between RNA and DNA I don't know. Left my book in school T_T *Help*

I have to give a speech to my class arguing that whaling is overpublicised, thanks to anti-whaling groups for attention and funds. Does the International Whaling Commission commend Japan's research papers? How many research papers have Japan written? Nick Gales from Australia says they've only written a mere 43 or so in 18 years, while Dan Goodman from Canada says they've written over 130. Even if Japan hasn't written a lot, or have made little progress, it doesn't mean that they haven't been trying. I'd like to hear from other scientists on this forum in regards to this issue. Thanks!

The reaction is: Volume of 6% H2O2 (mL):8.0 Volume of distilled water (mL):2.0 Volume of 1.0 M NaI (mL):10.0 Volume of distilled water (mL):0.0 O2 production in 60 s (mL):93.0 Question: Calculate the change in hydrogen peroxide concentration per second. This is the rate. (Hint: What volume of liquid does the hydrogen peroxide now occupy?). How would I do this?

1. When adenosine diphosphate is converted into adenosine triphosphate it is what cycle? 2. What occurs to nicotinamide adenine dinucleotide phosphate when produced in anaerobic conditions? 3. What would happen if an enzyme in you removed the CO2 from pyruvate before lactic acid was produced? i could present my thoughts if you'd like to see I atleast tried

Listen, I've never made a build-it-yourself-at-home project before i need to build an egg launcher. does anyone know how much it will cost? money's a little tight.