Homework answers and tutorials

Waiting for answer What is the standard equation of a circle with center ##(2,...
##(x+2)^2+y^2=16## The of a circle is. ##color(red)(bar(ul(color(white)(a/a)color(black)((xa)^2+(yb)^2=r^2)color(white)(a/a))))## where (a ,b) are the coordinates of the centr...
$10.00 
Waiting for answer Describe the cell membrane, cell wall, nucleus, and cytoplas...
Nice. A long one Basic Definitions: = the semipermeable structure that surrounds the cell and keeps all of the cells organelles from exploding everywhere. Cell Wall = the rigid...
$10.00 
Waiting for answer What is the formula of the expected value of a geometric ran...
If you have a geometric distribution with parameter ##=p##, then the expected value or mean of the distribution is ... expected value ##=1/p## For example, if ##p=1/3##, then the ex...
$10.00 
Waiting for answer Calculate the number of molecules in 10.92 g of CCl4?
We know from the molecular mass that 1 mole of C##Cl_4## = 154 g/ mol , and we can use this information to make a conversion factor. In this case, first we are converting from grams to moles and then from moles to number of molecules. 1 mol of C##Cl4## has mass 154 g/mol 154 g of C##Cl4## mak...
$10.00 
Waiting for answer A segment of steel railroad track has a length of 30,000 m w...
The lenght of the railroad at 40°C is: ##30,014.4m## The formula that we need is the thermal dilatation formula: ##l_2=l_1(1+lambdaDeltaT)##, where ##l_1## is the initial lenght, ##l_2## is the final lenght, ##lambda## is the coefficient of , ##DeltaT=T_2T_1## is the amount of incresing (if it...
$10.00 
$10.00

Waiting for answer Why were the reaper and the steel plow important?
These inventions were important because farmers no longer needed to hire workers, because they had new machinery. These workers moved to bigger cities and the employees of factories increased.
$10.00 
Waiting for answer Explain why dogs pant during hot summer days using the conce...
They have hardly any sweat glands, and these wouldn't be useful anyway under all that fur. Evaporating water takes a lot of . By panting, the water on the dog's tongue is forcibly ev...
$10.00 
Waiting for answer Is "hour" a countable noun? Is it an abstract noun?
It is a countable and abstract noun. A noun is countable if it has plural form and it can be used with numbers and word hour fulfills these conditions because you can say for example...
$10.00 
Waiting for answer What is 75 miles per hour in kilometers per second?
##0.0335## ##(km)/h## We need to convert ##75## ##(mi)/h## into ##(km)/h## Cancel the hours in the denominator ##rarr75 (mi)/h*(1h)/(3600s)## (as ##1## hour is ##3600s##) ##rar...
$10.00 
Waiting for answer What is the sample standard deviation formula?
s= ## [(xmean)/(n1)]^(1/2)## there is one difference between sample and population std deviation is degree of freedom. In sample , n observations are free to change whereas 1 is not that is use for estimating a population parameter.
$10.00 
Waiting for answer What is Graham's Law of Effusion?
Technically, it’s Graham’s Law of Effusion. The molecules of a gas are in constant motion, colliding with each other and with the walls of the container. The average distance that a molecule travels between collisions (about 0.1 µm or 300 times the molecular diameter for N₂ at STP) is called its me...
$10.00 
Waiting for answer What are some examples of diseases and disorders of the musc...
Myalgia, myositis, Muscular dystrophy, myasthenia gravis, tendinitis, tetanus, polio. Myalgia means muscle pain. Myositis means inflammation of muscular tissue. Muscular dystrophy is...
$10.00 
Waiting for answer How do you calculate moles of ions in solutions?
Calculate the number of moles of your solution, then use the of the ions to calculate the number of moles. e.g. 5g MgCl2 dissolved in 250ml of water Calculate of MgCl2 5g MgCl2 * 1mol/95.21g = 0.053mol MgCl2 0.053mol/.250L = 0.210M MgCl2 Calculate concentration of Ions (Mg2+ and Cl) Use...
$10.00 
Waiting for answer How is the kinetic theory of matter related to gases?
The kinetic molecular theory tells us how gas molecules are supposed to behave. In doing this, it makes a few assumptions about how gases behave. Let's have a look at them and see if they're right: Gas particles are infinitely small. In the real world, atoms and molecules are not infinitely sma...
$10.00 
Waiting for answer How do you find the vertex of the parabola ##y=2x^28x+7##?
A slight variant on method ##color(blue)("Vertex"  (x,y) (2,1)## Given:##" "2x^28x+7## Write as:##" " 2(x^2color(red)(8/2)x)+7## Consider the ##color(red)(8/2)" from "8/2x#...
$10.00 
Waiting for answer How many chloride ions will be found in the formula for coba...
Precisely ##2##. ##Co(II)## refers to a formal ##Co^(2+)## ion. And thus we have ##"cobaltous chloride, "Co^(2+)+2xxCl^##, ##CoCl_2##.
$10.00 
Waiting for answer What are alkoxide ion and alkyl bromide?
An alkoxide is the salt of an alcohol; an alkyl bromide is simply ##C_nH_(2n+1)Br## Alcohols are very weak acids, but can react with alkali metals to give alkoxides: ##ROH(l) + Na(s...
$10.00 
Waiting for answer Find the equation of the circle with diameter AB where A and...
##x^2+y^22x5y+3=0## Firstly, we can find the centre of the circle by finding the midpoint of ##AB##. Since it the midpoint or the centre ##(h,k)## cut AB with equal ratio; ##Centr...
$10.00 
Waiting for answer What is the definition of a high mass star?
In the Core of a Star be it any type, the pressure and temperature is high enough to squeeze atomic nuclei by initiating Nuclear Fusion. For instance Hydrogen nuclei fuse together to form Helium and from Helium to other heavier elements, But the heavier the element, the more the pressure and tempera...
$10.00