Yahoo Answers is shutting down on May 4th, 2021 (Eastern Time) and the Yahoo Answers website is now in read-only mode. There will be no changes to other Yahoo properties or services, or your Yahoo account. You can find more information about the Yahoo Answers shutdown and how to download your data on this help page.
Chess
Probability Question?
4 statistics professors and 10 chemistry professors are available to be advisors to a student organization. The student organization needs two of the professors to be advisors. If each professor has an equal chance of being selected, what is the probability that both professors are chemistry professors?
Apparently, 10/14 x 10/14 isn't right. Where did I go wrong?
1 AnswerMathematics1 decade agoCalculating precipitation question?
A lake has an area of 10 km^2. During a particular June the lake evaporation was 90 mm. During the same month the inflow to the lake from a river averaged 1.2 m^3/s and the outflow from a lake via another river averaged 1.1 m^3/2. Also, for the same month a water level increase of 100 mm for the lake was observed. Assume there are no other inflows and outflows. What was the precipitation during that month?
From this question, I am thinking that the answer is 190 mm. (90 mm evaporated and 100 mm stored). Is that correct?
1 AnswerMathematics1 decade agoCan someone help me get started on deriving the Maclaurin series?
I'm having trouble finding the Maclaurin series for f(x) = ln(2 + x^2). I'm supposed to derive it using the known M series equations for e^x, sinx, and/or 1/(1 - x), but I have no idea where to get started.
2 AnswersMathematics1 decade agoCalculus Area question?
Show that an observer at height H above the north pole of a sphere of radius r can see a part of the sphere that has area:
(2pi[r^2]H)/(r + H)
1 AnswerMathematics1 decade agoVolume/Integral Calculus Question?
The volume of a cell increases at a rate of 100/(1 + t)^2 cubic micrometres/s. If the cell is initially 500 cubic micrometres in volume, find its ultimate size after a long period of time.
1 AnswerMathematics1 decade agoTrig Substitution for Integration question?
∫ [x√(x^2 + 1)] dx
When I try to solve this problem, I get as far as 4 ∫ (tan theta)(sec theta)^3 d theta. Assuming I have done it right so far, where do I go from here?
2 AnswersMathematics1 decade agoRiemann Sum question?
If the right and left Riemann sums give the same value, what does that mean in terms of the geometry of the graph?
1 AnswerMathematics1 decade agoWhat should I let u be in evaluating this indefinite integral?
∫[sinx]/[(cosx)^2 + 1]
1 AnswerMathematics1 decade agoWhat is the antiderivative for this quotient function?
f(x) = (2 + x^2)/(1 + x^2)
2 AnswersMathematics1 decade agoWavelength and Light?
What is the wavelength, in nanometers, of light with an energy content of 1.4 x 10^7 kJ/mol?
2 AnswersPhysics1 decade agoMax Range and Max Endurance speeds?
Is it possible to determine the max range speed, knowing only the max endurance speed given this model:
D(v) = av^2 + (b/v^2)
where minimizing D(v) gives best endurance and minimizing D(v)/v gives best range.
1 AnswerMathematics1 decade agoWhich answers is admissible for this problem?
A spaceship moves along y = x^3 - 8x in the positive x-direction. Shutting off the engines at P allows it to move off along the tangent at P. Find P so that the ship can reach the point (4, 0).
I solved this problem and got:
x = 2
x = -1.46
x = 5.46
Which one of these x values would be admissible for this problem?
1 AnswerMathematics1 decade agoDerivatives .. is this answer right?
If g(x) + x sin g(x) = x^2 find g'(0)
I got -sin g(0) ... is this right?
1 AnswerMathematics1 decade agoFor the Dumas Method of determining Molar Mass of Volatile Liquids?
... How do I determine whether a particular volume of volatile liquid is sufficient to determine its molar mass?
For example, 4.00 mL of methanol and its density is 0.796 g/mL at 392 K, 1.037 atm, flask has a volume of 150 mL.
I'm pretty sure that when the gas evaporates and fills the entire flask, there must be enough gas to do so. How do I prove this?
2 AnswersChemistry1 decade agoHow do you solve for x with different log bases?
log(base 4)(x + 6) = log(base 2)(x)
1 AnswerMathematics1 decade agoCalculus Continuity question?
If f is continuous and 0 <= f(x) <= 1 for x belongs to [0, 1], then prove that there exists c in [0, 1] such that f(c) = c.
1 AnswerMathematics1 decade agoCalculus Continuity question?
If f is continuous and 0 <= f(x) <= 1 for x belongs to [0, 1], then prove that there exists c in [0, 1] such that f(c) = c.
1 AnswerMathematics1 decade agoHow do you find the limit to this function?
lim as x approaches infinity: xsin(1/x)
1 AnswerMathematics1 decade ago