Homework Help

Hello, I am having trouble with some homework given to us by a professor in a BASIC Astronomy class. Describe how you would design an experiment to determine the radius of the sun, writing down equations used in each step.We have been covering Stefan-Boltzmann constant so I assume he would prefer we use this in the process. This is all the info we were given to start the assignment. I understand the equation to use are: L=(Stefan-Boltzmann Constant) * T^4 * 4(Pi)R^2 Although not sure how to find L. Again this is a BASIC Astronomy, so nothing too complex (but sadly this one is too difficult for me). Thanks in advance for the help!

Hey all, i recently got an assessment task from my Senior Science teacher about our O.E.I and it's worth 30% and want to get it right, but he gave us a aim and list of equipment and i don't know why he put some of the equipment in but we need to use them all. Aim: 1. To design a valid method to determine how fast a selection of tablets and capsules take to dissolve in water. Equipment: Beakers Electronic balance or hanging pan balance stopwatch distilled water measuring cylinders filter paper, filter funnel, conical flask spoons i got all the tablets i just don't have a good idea of doing the experiment. any help available would be appreciated, thank…

Dear all, I am a university student in Hungary, currently working on my diploma. My topic is the consumer willingness to pay for non-genetically modified food products. Hereby I ask your help to take my survey in the following link: http://survey.e-businessportal.hu/index.php?sid=54152〈=en I'd really appreciate your help! Many Thanks! Attila Vörös p.s.: sorry if I was knocking on the wrong door!

C%w/w = msubstance / msubstance + msolvent x 100% What is the formula to solve for msubstance?

Ok, so here's the story. A week ago we did our first SAC (School assesed coursework) in my Year 12 Biology class. A sac is roughly the equivalent of a test at our school, but they're usually more extended response type questions. The sac was on enzymes in general. The experiment consisted of placing some liquefied liver in test tubes and then adding pH buffers to each one (pH's 1,4,7,9 and 14 used - this is somewhat important). We then added some hydrogen peroxide to the test tube and observed the reaction. For those who don't know, the liver contains an enzyme, catalase, that aids in the breakdown of hydrogen peroxide into oxygen and water. One of the questions on the sa…

I have a problem were given the data i plot the marginal cost and average total cost curves on the same graph. Then the problem asks to: "Identify the lowest per-unit cost on the graph." I am confused about which curve am i supposed to use. Judging by the shape of the graph (u shaped)its gona be the average total cost one. However, i have a feeling the answer should be the point where those 2 graphs meet. But i cant understand what would that point actually mean. See if you can help me. PS: the book i am using is Essentials of Economics. Schiller 6e p126 problem 3

TDS? Questions + Guessssses ! Could ya tell me which ones are right and correct those that are wrong? 3 experiements: 1) Place molasses in dialysis tubing and put it into a beaker of water (label beaker A) 2) Place Starch in dialysis tubing and put it into a beaker of water and an iodine solution. (label beaker B) 3) Place starch in dialysis tubing and put it into a beaker of glucose and water. (label beaker C) Questions + Guesses. 1) A 5 percent solution of molasses is place in a beaker filled with a 10 percent one. What happens? How come? Nothing happens because the molasses is unable to diffuse across the 'membrane' 2) List and describe …

Hi Friends! I'm planning to make a Galvanic/Daniell Cell (Electrochemistry). I've been given the following materials: 1. Magnesium Ribbon (5cm) 2. Zinc Strip (2cm by 5cm) 3. Copper Strip (2cm by 5cm) 4. Beakers 5. Crocodile Clips and Wires 6. One 1.5V bulb 7. One LED 8. 100Ω resistor 9. One switch 10. Potassium Chloride I'm wondering that since using the zinc and copper strips would produce an e.m.f of 1.10V, would it be enough to light up a 1.5V for at least 10 seconds or more? Does anyone have other possible combinations for the strips like instead of copper and zinc, say maybe magnesium and zinc etc.. If so, what would be the e.m.f output? If i use…

Basically, my friend and I conducted an experiemtn for 10th grade chem in which we used five liquids with different pH levels and measured the time it took for different liquids to dissolve a Jolly Rancher. I'm working on the final paper, and most of it is straight forward, but I can't find any information on the relationship between the pH of solvents and the time it takes to dissolve solutes. Does anyone know of any similar experiments or about the relationship (if there is one)? We found that the more alkaline solvents dissolve the candy faster, which wasn't what we expected. Does it depend on the solute? Can anyone help?

Consider a message D, presented by the following polynomial x19 +x17 + x16 +x13 +x12 + x11 + x9 + x5 + x2 + 1 Calculate the CRC code R for that message using a “generator-polynomial” x7 + x5 + x4 + x3 + x2 + 1. Represent in binary code the message to be sent (D and R). Generate 3-bit burst error and show the checking procedure (10 points) ************************************************** ***************** D = 10110011101000100101 G = 10111101 Divide using XOR Added 7 0's to D 101100111010001001010000000/10111101 Transmitted message = 10001100101010110101 R= 111001 Now I need to generate a 3-bit burst error and I assume that could be any…

A 16-bit word is coded in modified error correcting Hamming code and after that is stored into a cell of the main memory. After some time a program reads the cell and the following word is read into the memory data register: 0 0 0 1 0 0 0 0 0 0 0 0 0 0 1 1 0 1 1 1 1 1 Perform all operations, which the error correcting hardware does to analyze the word and to detect/correct the possible error. 0 0 0 1 0 0 0 0 0 0 0 0 0 0 1 1 0 1 1 1 1 1 21 20 19 18 17 16 15 14 13 12 11 10 9 8 7 6 5 4 3 2 1 Pall Pnew1 = CW1 + CW3 + CW5 + CW7 + CW9 + CW11 + CW13 + CW15 + CW19 + CW21= 1+ 1 + 0 + 1 + 0 + 0 + 0 + 0 + 0 + 0=1 Pnew2 =CW2 + CW3 + CW6 + CW7 + CW10 + CW11 + …

(Please delete the other duplicate thread. Sorry. Refreshed by accident) Recently I came across a confusingly-worded question (at least to me) in Physics. Semantics might matter, so I'm putting the entire question down ad verbatim: Four particles, each of mass 0.20 kg, are placed at the vertices of a square with sides of length 0.5m. The particles are connected by rods of negligible mass. This rigid body can rotate in a vertical plane about a horizontal axis A that passes through one of the particles. The body is released from rest with rod AB horizontal. Find: a) the rotational inertia of the body about axis A b) the angular speed of the body about axis A w…

I would like to have some help figuring out how many people that is needed in order to lift a car (and how you would calculate it). Here is an example of the problem: Mass: 500 kg Length of the bottom of the car: 2,5 m Width of the bottom of the car: 1 m Height of the car: 1,5 m Let's assume the car is shaped as a regular box. Let's assume that the mass is distributed evenly throughout the box. All the people to lift are placed around the car with equal distance between each other (if you drew a polygon connecting everyone, all the sides of the polygon would have the same length). Everyone is holding underneath the bottom of the car. Let's assume…

Ok, so we are given that {an} is the sequence 1/2, 1/3, 2/3, 1/4, 2/4, 3/4, 1/5, 2/5, 3/5, 4/5, 1/6, 2/6, .... Now, the problem says suppose that 0< a < b <1. Let N(n; a,b) be the number of integers j<n such that aj is in [a,b]. I can't figure out exactly what this means ( i.e. given any n, a, b what does it equal?) It does say that "Thus N(2; 1/3, 2/3) = 2, and N(4; 1/3, 2/3) = 3." Our actual job is to prove that lim n->infinity of [N(n; a,b)]/[n] = b-a. So, I can't begin to start the problem until I figure out what the question even means! Also, if the value is supposed to be an integer then how can the limit be b-a (a non integer…

Hello, everyone, Following is the question that I am not really able to do. I would be grateful if someone can guide me through the solution. Thanks The electric-field strength as a function of position x in a certain region is given by [math]E = E_0 \left( {x/x_0 } \right)[/math], where [math]E0 = 26 {\rm kV/m}[/math] and [math]x_{0} = 5.2 {\rm m}[/math]. Find the total energy stored in a cube [math]1.0 {\rm m}[/math] on a side located between [math]x = 0[/math] and [math]x = 1.0\;{\rm{ m}}[/math]. Note: The field strength is independent of y and z.

Hi there I hope you people must be doing well & if you be kind enough to please help me in my problem I would be grateful thx. Maqbool This is Physics question related to ideal gas Q: A uniform capillary tube, closed at one end, contained air trapped by tread of mercury 85mm long. when tube was held horizontally , the length of the air column was 50mm. when it was held vertically with a corked end downward The length was 45mm. find the atmospheric pressure. take g=10 Density of mercury; 14 x 10^3 How to solve it I tried it answer comes 5, use p=density x gravity x change in length Ans should be 1.01 x 10^ 5 (according to Mark scheme). …

Hello, I need help increasing the number of sig figs that excel gives for the equation of a trendline. At the moment it is only giving me one:mad:. I don't want to have to resort to using the slope equation because this has worked for me in the past but I feel it is time to fix this problem once and for all.

The function defined on R by f(x)= (2/3)x+2 And cf his graphic representation in an orthonormal mark (o; i; j) On the X axis, we consider points A, B and H of respective abscissas 3, -3 and x (x belongs R) Or C the point of Cf of the same abscissa as A and M the point of Cf of abscissa x 1°) Make the complete figure ? 2°) Calculate the distances AH and MH according to x and by means of the absolute values ? 3°) To determine for which value (s) of x the areas of triangles CHA and MOB is equal ? Please Anyone for help me, Can you draw this graphic please please and represents all points A B H M and C

Two Questions Now! My guesses/thoughts provided? Any help? Thanks! 1. If CO2’s concentration in the fluid out of the cell was higher than inside it what would occur? What would make it so this would not typically happen? - The cell would shrink. Equilibrium prevents it. 2. Why do gardeners soak their fresh veggies in salt water before fresh water? - To create an electrolyte? I honestly have not a clue. ^

I don't know where to start. Could someone help? A 7.67 M solution of an acid, HX, has a density of 1.192 g/mL. THe acid, HX, has a molar mass of 53.00 g/mol. Determine the concentration of this solution in molality, Xhx(mole fraction of HX), and %w/w(percent by mass). The solvent in this solution is water, H2O.

I know that 5 vol H2O2 is equal to 0.44moldm-3. in my experiment i used 5cm3 of 5vol. i then diluted this, using 4cm3 of 5 vol H2O2 and 1cm3 distilled H2O. How do i work out the concentration of this? I have tried various methods and...(this may be stupid and very wrong but i wanted to show i'd tried!) if 4 is 80% of 5 then can you find 80% of 0.44? - meaning 4cm3 H2O2 + 1cm3 H2O would have a concentration of 0.32 moldm-3..is this correct? through this method i have worked out that: 3cm3 H2O2 + 2cm3 H2O = 0.264 moldm-3 2cm3 H2O2 + 3cm3 H2O = 0.176 moldm-3 1cm3 H2O2 + 4cm3 H2O = 0.08 moldm-3 0.5cm3 H2O2 + 4.5cm3 H2O = 0.044 moldm-3 Help greatly a…

Ok, now, i am going to go out on a limb here and say that this is a little confusing to explain in words, but i will try. ok, so the ball traveles 3 meters in 1 second. the average velocity 3m/s the final velocity is 6 m/s the acceleration is 6 m/s/s or 6m/s squared. as you know, the distance traveled here is 3 meters. So now i must find out the distance traveled on the next stop. The ball is rolling down the ramp, most people would assume that the next distance traveled would be six meters (distance recorded for every second from the start point) BUT the acceleration changes that. Am i right in stating that to find the distance i would have to do this? 1/2 acce…

What would be the location of circular and straight line fringes for both point and extended sources in a Michelson interferometer? How would I use the Michelson interferometer in the analysis of spectral lines? I think there is no refraction in the Michelson interferometer so how could individual spectra be separated?

A grating with N slits of spacing d is iluminated normally with monochromatic light of wavelength λ, and the p-th order principal maximum is observed at an angle Өp. The intensity at angle Ө is given by: I(α) = sin²(Nα/2)/sin²(α/2) where α=(2Π/λ)d*sin(Ө) Show from this equation that adjacent minima fall at angles Өp+αӨp and α-Өp, where αӨp = λ/(Ndcos(Өp)) Could someone please help me? I tried to differentiate the Intensity equation w.r.t. α to find what the values of the minima and maxima are, but then realised, that the separation of minima from maxima must depend on the angle Ө. I don't know how to approach this further.

Hey guys, I have a hw question I am stumped on, and I need help. I did most of it, so I'm going to post the question and what I did do; my problem is the last part of finding "d". The Question: When the light illustrated in the figure passes through the glass block, it is shifted laterally by the distance d. Taking n=1.50, find the value of d. Illustration: ((i have a few problems for some reason... if it doesn't load, the illustration is here)) My partial solution: n1*sin(theta1)=n2*sin(\theta2) n1=1.000 (in air) n2=1.5 (given) so: sin(theta2)=sin(30)/1.5 theta2=19.47 deg theta3 (emerging) is 30 degrees again (the same form…