Homework Help

Okay, So This is probably easy compared to most of the problems presented on this website, but it would help immensely if I could recieve some help with it. -The problem is as follows: When mixing a quantity of paints, dyes of four different colours are used in the ratio of 7:3:19:5. If the mass of the first dye used is 3.5g, determine the total mass of the dyes used. -I have Tried to construct an equation for this, but to no avail. This problem I believe is in relation to an earlier, simpler problem: Problem 15. An alloy is made up of metalsA and B in the ratio 2.5:1 by mass. How much ofA has to be added to 6 kg of B to make the alloy? Ratio A:B:…

Hi all so i did an experiment on beetroot where i had to soak the beetroot peices in the organic solution 'methanol'. I know that the lipid bilayer of the beetroot will get denatured and the pigment betacyanin will leak out but why/how would organic solvent allow the dye to leak from the vacuoles? I am having trouble thinking about this.. Can someone give me some information on this if they have done the same thing or similar ? thanks

What is electricity, where can we find electricity, from which word electricity was form from and what are the funtion of electricity

Please help... What are some movies related to cytogenetics? I know only two -- The Boy in the Plastic Bubble starring John Travolta and Gattaca.

I have trouble solving this problem. Can anyone help me out? 2NaOH + H2SO4 gives Na2SO4 + H2O What is the volume of a 0.750M of H2SO4 solution is needed to react completely with 15.0gms of NaOH? Ans is 0.251L. Thank you.

What is circuits used for at home, anything to describe when you present them and do it as a news report? Thank you very much (:<br><br>Edit:<br>There is two type of circuits- parallel and series. Parallel is used in households instead of series. If you install a new appliance in a series circuit and some how it breaks, the whole circuit goes off. Using a parallel circuit, the total current is equal to the combined current of each branch. <br>Advantages: In a parallel circuit, if one of the component goes off, the rest of circuit still works. Total resistance is less than the individual smallest resistance across the circuit.<br><br>is …

Don't really get what to do... A hunter shoots a 500g arrow at a 2kg bird perched on a tall tree growing on a flat ground. The arrow is launched from ground level with a speed of 40m/s at an angle of 30 degrees above the horizon. It is traveling horizontally when it strikes and embeds into the bird. How far from the base of the tree do the bird and arrow land? So I found that (using the law of conservation of momentum) the momentum of the bird + arrow is 20kgm/s, and the velocity of the arrow + bird is 20m/s. And I know we can form a triangle thing out of the velocities or momentums but...I can't seems to find distance! Which is the thing we're looking for! Help?

Hi guys. I need some help with my homework. Here is the question and then I will tell you where I got stuck What volume of a 3.75 M MgSO4 solution can be prepared with 271g of MgSO4? Ok so I first calculated the molar mass of MgSO4 with the periodic table. Mg= 24.3. S= 32 and O4 = 16x4=65 TOTAL mass of MgSO4 is 120.3g and 271g of it is being used (so about 2.252x more than the initial mass. 2.252 x 120.3 = 271) Sadly I am now stuck. Can someone give me a hint? I will then try to finish figuring it out and post my final answer. Thank you Ok so I just looked at it and did 3.75 x 120.3 = 451.125. I then divided that by 271g to get 1.16646 etc which I …

This is not a homework question, that I work on integration of normal distribution and found some difficulties. The difficulty could be summarised in integrating this: f(x) = e^(x^2), I am not familiar to integrating exponential function to power x. Hope could get some help, thanks.

1/[math]\sqrt{11-2\sqrt{30}}[/math]-3/[math]\sqrt{7+2\sqrt{10}}[/math]-4/[math]\sqrt{8-4\sqrt{3}}[/math]

A sign for a restaurant has a mass of 82 kg. It is held out from the wall by a light horizontal steel rid which supports no weight and a wire at 40 degrees to the horizontal. (This will form a right triangle). Find the tension in the wire and the compressions in the steel wall. For the tension in the string, I know that once we find the vertical force of the sign (803.6 N [down]), then we can use 82sin40 to find the tension in the string. But what about the wire? Is the force just the force of the object itself (so 803.6N [down])? Also, in a question where an object is hanging from the center of a rod or string or something, will the tension in either side of th…

We're supposed to calculate average acceleration: So we're given a situation of a plane traveling some distance with four different velocities. We were taught that, to draw a velocity vector diagram for it (NOT a displacement one), we're supposed to use draw it using the first and last given velocities. Then, say we know an angle for the triangle formed, we can use cosine law to find the resultant displacement. My question is, since acceleration is a = Δv/Δt, then why do we need to find the resultant displacement, why not just subtract v2 from v1 to find the change in velocity? Why use the displacement?

Ok I understand that they are all linked. But my partner come out of his bio classes confused and we always have different ideas when it comes to science so.. On what basis.. What is the use of them, I know DNA but im lost with tRNA and mRNA now that my partner has told me loads of crap

Just a (simple) problem that I couln't solve. A motorcycle starts from rest and, moving with uniform accelerations, moves 66m in the sixth second (from time equals 5.0s to time equals 6.0s). What is its acceleration, and what distance does it travel in the 7th second? I'm not really sure how to do this. Why can't we do the following? So to find acceleration, the equation is a = Δv/ t, or (v2 - v1) / t. And v2 = d/t. So v2 = 66 /1 = 66 So, to find acceleration: a = (v2 - v1)/t = (66 - 0) / 6 = 11 But that's not right! And a friend told me it was supposed to be 66 / 5.5, but he doesn't explain why either! So I don't get it. Help?

hi everybody, I am doin ma MS..i am in need of the following images ..paired and unpaired images of chromosome showing the following abnormalities..Klinefilter syndrome,down syndrome,Turner syndrome,Triple x syndrome,Jacob syndrome,Edward syndrome..pls helpme wid dhe images ..mail me or send me de link it ll be useful for my project..it should be of 400 band resolution..

Hi, I need one important source of error that would effect the precision of graduated pipette ? I have run out of errors, Anyone has any ideas let me know

Can someone please take a look at this and tell me where I am going wrong? It’s part of a calculation for an Enzyme Activity Assay. My enzyme solution prep is as follow: 0.02g to 50mL with deionised water (stock), 1 mL of stock to 200 mL with deionised water. 0.5mL of this is added to the reaction mixture (RM) – total volume of reaction mixture is 10.0mL. One of the parameters in the activity calculation is - (mg of enzyme / RM) so is it just a case of (20*1*0.5)/(50*200*10) = 1 x 10-4 – 0.0001 mg/mL of reaction mixture Any help appreciated.

Hi, I have to do some calculations and i am not sure how to do them. One of the question is % diffrence between expected compared to the mean aliquot weight, as a % of the expected wt. The mean aliquot weight is 33148 for one of the data list. the expected is 0.1 And i need to calculate this for my 100 microlitre samples and 1ml samples so will i have to convert microlitres to ml in any case ? any ideas thank you

No this is not homework, i am reposting it here so it is more visible and it gets answered. This pertains to my job, and its more just Gee-Wiz stuff that will help me do my job better. Steerable Beem Antenna Array Hey, Could anyone explain to me just how a SBAA(Steerable Beem Antenna Array) works? I'm not quite sure how it works on the physics side or the physical side. I know that an Antenna Array is just a array of antennas aranged in a perticular patter and have length properties proportionall to thier frequency ranges. Such as the smallest antenna in the array has to be less than 1/2 the smallest frequency in size, and the largest being greater than 1/2 th…

Hi, does anyone know how to plot data on semi-log graph paper ? i have no idea, i read on a website but its not clear. Can someone please explain to me? or give me a website link thanks

Hi how can you calculate dilution factors ?

Alright, hello all, like the title suggests I need some help with a chemical reaction involving Iron nails, hydrogen peroxide (30% solution) and sodium chloride. I'm fairly certain the iron will form oxides and that there will be water present as a product, but I don't really know what else happens. To recap: Iron nails, hydrogen peroxide and sodium chloride mixed together will form what?

Quick question, how do I integrate this? ~sin(2x)cos(3x)sin(4x)dx I can't figure out how to do it. I've managed to get an answer using cos(nx)=(z^n+z^-n)/2 and sin(nx)=(z^n-z^-n)/2i, but somehow I get the feeling that isn't how I'm supposed to do it... I am familiar with inegration by parts, ~F(x)=~G(u)u' [and another one like the previous that I can't remember how to write], double angle rules, and naturally 1=sin(x)^2+cos(x)^2 I still can't figure out how to do it though, given that we're supposed to be able to do it using only those. I think I remember reading somewhere a rule that I think was sin(a+b)=sin(a)-sin(b), but I don't think it will really hel…

Hi can anyone help me with this chemistry question, im finding it very difficult. If an enzyme catalysed reaction has a maximal velocity of 25micromole min-1 and km for the enzyme and substrate is 3 mM, what is the initial reaction velocity for a substrate concentration of 3 mM? please help thank you

Hi, I basically have been given this essay title, 'Human physiology is dominated by homeostasis'. using a range of named examples discuss this statement. I was just wondering what type of things i can include in this as its quite a wide topic. I will include general stuff about homeostasis, and have mentioned fight or flight response of the nervous system, and some examples of endocrine system. Any ideas let me know thanks