Mischa
Newest questions and responses by Mischa
Chemistry
Consider this reaction: 3 K2CO3 (aq) + 2 CrCl3 (aq) > Cr2(CO3)3 (s) + 6 KCl (aq) If 1.2 moles of CrCl3 react, how many moles of K2CO3 will react with it? A. 0.80 mol K2CO3 B. 1.2 mol K2CO3 C. 1.8 mol K2CO3 D. 2.4 mol K2CO3 I'm not sure where to even
asked on April 11, 2015 
c++
how do you pass only part of an Array through a function? I thought it was something like function(Array, 5); but it's not working...
asked on April 2, 2009 
diffeq
how do i find the bifurcation for this: d^x/dt^2 = .3 x  (x  1)/((x  1)^2 + a^2)^(3/2)  (x + 1)/((x + 1)^2 + a^2)^(3/2) we've tried using mathematica but it just runs forever...
asked on March 25, 2009 
diffeq
Let P(t) represent the population of a nonnative species introduced to a new area for the purposes of harvesting. Suppose we intially introduce P0 = 100 indicidcuals and suppose the population grows exponentially with growthrate coefficient k=2 if there
asked on February 23, 2009 
diffeq
Suppose a species of fish in a particular lake has a population that is modeled by the logistic population model with growth rate k, carrying capacity N, and time t measured in years. Suppose the growthrate parameter k=.3 and the carrying capacity N=2500.
asked on February 4, 2009 
chemistry
suggest a mechanism for 2Fe(3+) + 3I > 2Fe(2+) + (I3)
asked on December 6, 2008 
physics
a very light rigid rod with a length of .500m extends straight out from one end of a meterstick. the meterstick is suspended from a pivot at the far end of the rod and is set into oscillation. determine the period of oscillation (hint: use the
asked on December 5, 2008 
physics
A car moves with speed v on a horizontal circular track of radius R. The height of the car's center of mass is h, and the separation between the inner and outer wheels is d. The road is dry, and the car does not skid. Find the maximum speed the car can
asked on November 20, 2008 
chem lab
If a sample tube was smudged with a fingerprint when inserted into a spectrometer, what affect would this have on the value of A (absorbance) when you read it? explain.
asked on November 13, 2008 
stats
Consider an infinite population with 25% of the elements having the value 1, 25% the value 2, 25% the value 3, and 25% the value 4. If X is the value of a randomly selected item, then X is a discrete random variable whose possible values are 1, 2, 3, and
asked on November 6, 2008 
physics
A bicycle has wheels 67.3 cm in diameter and pedal cranks 17.5 cm long. The cyclist pedals at a steady cadence of 76.0 rev/min. The chain engages with a front sprocket 15.2 cm in diameter and a rear sprocket 7.00 cm in diameter. Calculate: a) the speed of
asked on November 4, 2008 
chem
The solubility product of Mg(OH)2 is 1.2 x 10^11. What minimum OH concentration must be attained (for example, by adding NaOH) to decrease the Mg concentration in a solution of Mg(NO3)2 to less than 1.0 x 10^10 M (molar)?
asked on November 1, 2008 
chem
which is the least stable isomer of C4H8: methyl cyclopropane or cyclobutane and why?
asked on October 24, 2008 
chemistry
which is more stable: methyl cyclopropane or cyclobutane and why?
asked on October 20, 2008 
chem
The solubility of KNO3 is 155 g per 100 g of water at 75 degrees celcius and 38.0 g at 25 degrees celcius. What mass (in grams) of KNO3 will crystallize out of solution if exactly 100 g of its saturated solution at 75 degrees celcius is cooled to 25
asked on October 16, 2008 
chem
A hemoglobin molecule (molar mass =65000 g) can bind up to 4 oxygen molecules. In a certain experiment a .085L solutoin containing 6.0 g of deoxyhemoglobin was reacted with excess of oxygen in a constantpressure calorimeter of negligible heat capacity.
asked on October 4, 2008 
chemistry
The fuel value of hamburger is 3.6kcal/g. If a man eats 1 pound of hamburger for lunch and if none of the energy is stored in his body, estimate the amount of water that would have to be lost in perspiration to keep his body temperature constant. (the heat
asked on October 4, 2008 
chemistry
What hybrid orbitals are used by nitrogen atoms in the following specis: (a)NH3 (b)H2NNH2 (c)NO3 I got sp^2 for (a), but I'm not sure about the other two.
asked on September 25, 2008 
stats
I have to do an observational study for an AP statistics course. Does anyone have any good ideas?
asked on May 13, 2008 
quantum physics
After a .800nm xray photon scatters from a free electron, the electron recoils with a speed equal to 1.20 x 10^6 m/s. (a) What was the Compton Shift in the photon's wavelength? (b) Through what angle was the photon scattered? I got an answer for (a), but
asked on May 7, 2008 
physics
A construction worker uses a steep tape to measure the length of an aluminum support column. If the measured length is 18.700 m when the temperature is 21.2 degrees celcius, what is the measured length when the temperature rises to 29.4 degrees celcius. I
asked on March 13, 2008 
statistics
What is an example of two events that are neither disjoint nor independent? (I have no idea how that would even work)
asked on February 26, 2008 
english
is it underfunded or under funded?
asked on February 23, 2008 
gov't
Does anybody know a site that rates the education systems of countries? I know Britain's number one...
asked on February 14, 2008 
physics
What are examples of when friction can increase an objects Kinetic Energy?
asked on February 13, 2008 
physics
for a free throw in basketball,find an equation for the final angle to go into the hoop in terms of y and x to the hoop and the initial angle. I can't seem to get an equation with only those variables. I always get stuck with others like time and velocity.
asked on February 3, 2008 
calc
Find m and b so that y=mx+b is a solution to the differential equation dy/dx=1/2x+y1
asked on January 24, 2008 
Calc
Find the velocity of a satellite orbiting above the equator of the earth in geosynchronous orbit (Period=24 hours) in km/hr. The earth's mass M=5.974x10^(24)kg and radius R=6,731 km. G=6.673x10^(11) m^3/(kg*s^2) Use v=(G*M/R)^(1/2) I plugged everything in
asked on January 18, 2008 
math/physics
Help! I have no idea how to do this. The earth's orbit is nearly circular with a radius R=93x10^6 miles (the eccentricity is e=.017). Find the rate at which the earth's radial vector sweeps out area in units of ft^2/s. What is the magnitude of the vector
asked on January 18, 2008 
works cited page
I am doing a works cited page in MLA format. If I have two articles that are from the same website, just different places, do I document it as one source or two different ones?
asked on December 3, 2007 
english
I need to write 2 process essays. Any good ideas? I know there's so many things I can do, but it's hard to come up with a good one.
asked on October 19, 2007 
French
I am not sure about the ordering of the words. Are the following correct? Do you speak French? Vous parlez francaise? I speak a little French. Je parle francais comme ci comme ca. My mom speaks french too. Ma mere parle francais aussi.
asked on September 24, 2007 
French
Based on all the questions I've asked. I believe there are no mistakes in these sentences? J'aime la musique japonaise. J'ai un frere, il a vingt sept ans. Elle a vingt ans. Elle est jeune, elle est jolie. (Should I use jolie or belle?) Elle aime la
asked on September 22, 2007 
French
When I say I have one brother and he is 27 years old, do I say J'ai un le fr¨¨re or J'ai un fr¨¨re Il a vingt sept ans.
asked on September 20, 2007 
French
I have to fill out this chart, I want to know did i do it correctly, thanks. Etre: Tu es Aimer: Tu aimes Habiter: tu habites s'appeler: tu s'appelles Parler: Tu parles
asked on September 20, 2007 
French
I know that for a male to say that he is french, we use francais, and for a female, we use francaise. But when a female says that she speaks french, do we use francaise as in Je parle francaise? And when a female says that she likes French music, do we use
asked on September 18, 2007 
Graph constraints
Suppose that there is a model with two constraints 1) 120x1+160x2
asked on September 16, 2007 
Graphs
Suppose there's a model with 2 constraints originally. Now that another constraint is added. Which of the following are possible: 1) feasible region shrinks 2) feasible region stays the same 3) feasible region expands and Which of the following are
asked on September 16, 2007 
english
I need a title for a narrative about my fear of snakes and the time one got loose in our classroom. Any witty ideas?
asked on September 13, 2007 
history/poetry
Can anyone help me interpret this poem/prayer? What does it reveal about Mesopotamian religious beliefs and practices? Thanks!! May the wrath of the heart of my god be pacified! May the god who is unknown to me be pacified! May the goddess who is unknown
asked on September 5, 2007 
english
I'm suppose to figure out what the leg is a metaphor for in the following story. I can't figure it out. Any suggestions?! Letter from Gaza by Ghassan Kanafani Dear Mustafa, I have now received your letter, in which you tell me that you've done everything
asked on May 23, 2007 
calc please help
given x=2cos(t)+t*sin(t) and y=2sin(t)t*cost(t), with t:[pi, 2pi] find all critical values. (4 answers)
asked on May 21, 2007 
calc 2
given x=2cos(t)+t*sin(t) and y=2sin(t)t*cost(t), with t:[pi, 2pi] find all critical values. by finding dy/dx and setting it equal to zero, i only find one value, t=6.121, within that domain. that gives you x=.987. I'm suppose to get three other answers.
asked on May 20, 2007 
calc
let y=2x8. What is the minimum value of the product xy? I'm not really sure how to do this... I tried taking x*(2x8), and the min is 0. but then i wanted to see if it was the same when solving for x, and i got a min of 8. How do i do this problem?
asked on May 2, 2007 
physics
I need to find the centripetal acceleration of my clothes dryer. How would I go about doing it... Would the tangential speed just be 2pi*R*number of rotations/time, or how would I find that? Put a shoe in the dryer. Count the number of times the shoe
asked on May 1, 2007 
calc/physics
A force of 250 N is required to stretch a spring 5m from rest. Using Hooke's law, F=kx, how much work, in joules, is required to stretch the spring 7m from rest? The energy required scales with x^2. Multiply 250 J by (7/5)^2.
asked on April 23, 2007 
physics
An electron and a proton are each placed at rest in an external uniform electric field of magnitude 520 N/C. Calculate the speed of each particle after 48 ns. None of the equations I have seem to help me. What can I use to solve this problem? I figured it
asked on April 12, 2007 
physics
Three point charges, q1, q2, and q3, lie along the xaxis at x=0, x=3 cm, and x=5 cm, respectively. Calculate the magnitude and direction of the electric force on each of the three points when q1=+6.0 muC, q2=+1.5 muC, and q3=2.0 muC. I would add the
asked on April 11, 2007 
Calc AB
What is the area of the region in the first quadrant enclosed by the graph of y=e^(x^2/4) and the line y=0.5? When I graphed the two functions they don't even connect so the answer would be infinity. What am I doing wrong> Integrate y=e^(x^2/4) from x=0 to
asked on March 27, 2007 
Calc
Does 1/ln(x+1) converge or diverge? I've tried the nth term test, limit comparison test, and integral test. All I get is inconclusive. The other tests I have (geometric series, pseries, telescoping series, alternating series, and root tests) don't apply.
asked on March 22, 2007 
physics
A bird perched on a swing the sits 8 cm below a bar has a mass of 52 g, and the base of the swing has a mass of 153 g. The swing and bird are originally at rest, and then the bird takes of horizontally at 2 m/s. How high will the base of the swing rise
asked on March 20, 2007 
Calculus
Boats A and B leave the same place at the same time. Boat A heads due North at 12 km/hr. Boat B heads due East at 18 km/hr. After 2.5 hours, how fast is the distance between the boats increasing? You are looking at a rightangled triangle, let S be the
asked on March 1, 2007 
Calc
The radius of a sphere is increasing at a rate proportional to its radius. If the radius is 4 initially, and the radius is 10 after two seconds, what will the radius be after three seconds? dR/dt = c R Integrating this differential equation gives you ln
asked on March 1, 2007 
Math
x/3=2 x=2*3 x=6 x/6=3 x=3*6 x=18 How would I get the missing number? ?/3 = 2 ?/6 = 3 What number divided by 3 will equal 2. Multiply 3 times two for the answer. Same for ?/6=3. what do u divide by to get 2 what u divide by to get 3
asked on March 1, 2007 
Physics
A worker pushes a 1500 N crate with a horizontal force of 345 N a distance of 24 m. Assume the coefficient of kinetic friction between the crate and the floor is .220. How much work is done by the floor on the crate? M*g*(mu,k)*X Mg = 1500 N mu,k = 0.220
asked on February 27, 2007 
Physics
A student pulls on a rope attached to a box of books with a mass of 35.0 kg and moves the box up a ramp at 12 degrees with the horizontal. If the box starts from rest at the bottom of the ramp and is pulled at an angle 25.0 degrees with respect to the
asked on February 25, 2007 
calculus
The volume of a solid is given by V=pi x^2(lnx)^2. what is the approximate change in the volume when x is increased from 2.718 to 3.000? dv= PI 2x(lnx)^2 dx + Pix^2 *2lnx * 1/x reduce that. For x, use 2.718 dx= 32.718 check my thinking.
asked on January 9, 2007

Math
A triangle can be both scalene and right angled
posted on November 13, 2017 
english
i don't believe that is correct ask mrs sue
posted on April 4, 2016 
Chemistry
Thank you very much! I over analyzed it and made the problem harder than it was. That makes complete sense. Thank you for your speedy reply!
posted on April 11, 2015 
chemistry
the rate law is R=k[Fe3+][I]^2
posted on December 6, 2008 
chem
ever mind...i got it.
posted on October 16, 2008 
physics
never mind. i got it.
posted on March 14, 2008 
Calculus
that one's arcsin. factor it into: 4*integral(1/sqrt(16(t^2+2t+1)))dt so, 4*integral(1/sqrt(4^2+(t+1)^2))dt divide everything in the sqrt by 4^2 and bring it out as 1/4, 4/4*integral(1/sqrt(1+((t+1)/4)^s))dt) now it's in arcsin form (remember u and du) so
posted on February 14, 2008 
Physics
use v^2=Vo^2 + 2*a*x
posted on February 14, 2008 
Calculus
Actually, it's arctan. 3/10*integral(1/((x1)^2+1))dx =3/10arctan(x1) + C
posted on February 14, 2008 
Calculus
try factoring the bottom and using the triangle rule
posted on February 14, 2008 
Geometry
The area of a trapezoid is H*(b1+b2)/2. 128=32*(5+x)/2 128=16(5+x) 8=5+x 85=x x=3 inches
posted on January 18, 2008 
Geometry
Complimentary angles add up to 90*. so 908=82 and 82/2 (b/c there's 2 x's) is 41. so the two angles are 41 and 49, the smaller one being 41*.
posted on January 18, 2008 
Algebra II
1st#=x2 2nd#=x 1/2(x2)+x=41 x2+2x=82 3x=84 x=28
posted on October 19, 2007 
French
So actually the order of the words doesn't really matter in French?
posted on September 24, 2007 
French for Mischa
Is this sentence correct? She has 3 male cousins and 4 female cousins. Elle a trois cousins et quatre cousines.
posted on September 23, 2007 
French for Mischa
We didn't need a french name for class, but Miche sounds nice. And thanks for doing this, I really appreciate it.
posted on September 23, 2007 
French for Mischa
Personally, I really like the sound of the language. And I always wanted to go to France, maybe travel or even for work. I am just really interested in French culture. I would love to know some of your 75 good reasons to learn french.
posted on September 22, 2007 
French
Wow, that's amazing!
posted on September 22, 2007 
French
I figured I rather do the accents by hand. lol Yeah, I am pretty sure where the accent goes. I was just wondering, how many languages do you know? You seem to know quite a lot.
posted on September 22, 2007 
French
Thanks, actually i just start learning french two weeks ago. I have a question from before, you said that the adjective modifies the noun in number (singular/plural) and gender (masculine/feminine) and has nothing to do with the subject. la musique goes
posted on September 20, 2007 
French, for Mischa
Thanks, SraJMcGin.
posted on September 19, 2007 
French
I have a PC and Windows
posted on September 19, 2007 
Marketing
no, i guess all kinds of pet food.
posted on September 19, 2007 
French
I remember that accent mark, I just don't know how to type it in. =) Thanks again.
posted on September 19, 2007 
French
And also, if a male says that he likes French music, so we also use francaise as in J'aime la musique francaise?
posted on September 19, 2007 
French
o...so there's nothing like le musique or le danse. I just have to remember the nouns, I get it now, thanks. And my textbook is called initial 1.
posted on September 19, 2007 
French
Thanks. I have another question. This sentence comes straight out of my textbook. Il aime la danse, la musique. Il is he, so why would it not be le danse, le musique?
posted on September 18, 2007 
Algebra
1812x
posted on September 16, 2007 
math
What are you trying to do?
posted on September 16, 2007 
prealgebra
a(ac)=23 ac=23/a c=a23/a
posted on September 14, 2007 
math
(5x20)(x+3) (x^29)(x^2+9) Then are you sure the third one is written right? 18a^2b is a to the 2b or is b something else
posted on September 5, 2007