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.
Avinash
My Skype id is sahay.avinash I am from India. Send me an email if you are interested in online tuition from me. I provide online tuition in Physics Chemistry Mathematics Statistics Computer Science My Skype id is sahay.avinash
What cools hot water more - ice or cold water?
Consider following two scenarios
a) Ice is added to hot water
b) Cold water is added to hot water
In which case will the hot water cool faster?
2 AnswersChemistry3 years agoWhat cools hot water more - ice or cold water?
Consider following two scenarios
a) Ice is added to hot water
b) Cold water is added to hot water
In which case will the hot water cool faster?
2 AnswersChemistry3 years agoHow to draw a gate to take a 4 bit input and add 5 to it?
Using only AND, OR, XOR, NOT gates, and your half/full adder gates, draw a gate that takes a 4 bit input and adds 5 (0101) to it.
1 AnswerProgramming & Design3 years agoWhich of the following compounds, when added to an aqueous solution of HF, would cause an increase in the pH?
Which of the following compounds, when added to an aqueous solution of HF, would
cause an increase in the pH? Which would cause a decrease in pH? Which would not have an effect on the pH?
NaF
SnF2
HCl
NaCl
NaOH
H2O
My answer (see if it is correct):
NaF, SnF2, NaOH will increase pH. Reason: When NaF or SnF2 is added, then, due to common ion, F^-, equilibrium will shift to left, so H^+ decrease and that means pH will increase. When NaOH is added, then OH^- ion will reduce H^+ concentration, so pH will increase.
HCl will decrease pH. Reason: HCl will add H+, so pH will decrease.
NaCl and H2O will not affect pH.
2 AnswersChemistry3 years agoWhich of the following is the strongest acid?
Propyne
Propene
CH3CH2OH
CH3—NH—CH3
CH3OCH3
2 AnswersChemistry3 years agoFind eigenvalue of A^3 - 2A + 4I given eigenvalue of A?
1 AnswerMathematics4 years agoIn which websites do students post ads for online tutor?
2 AnswersTeaching4 years agoEach letter represents a different digit (1 to n). What digits do the letters represent?
H E R E S
M E R R Y
X M A S
--------------------
R E A D E R
The numbers "HERES", "MERRY" and "XMAS" are added and "READER" is the result.
What digits do the letters represent?
1 AnswerMathematics4 years agoWhat are the vertex and the focus of (x+y)^2 = 2x - (1/2)?
Consider the equation
(x+y)^2 = 2x - (1/2)
This is a parabola but it is neither horizontal nor vertical. How do I find its vertex and focus?
4 AnswersMathematics4 years agoWhat affordable camera to use for recording lectures?
I live in India. I want to explain some concepts (related mostly to Physics and Mathematics) on a board in my room. I want to record it and post on YouTube.
What camera should I go for?
4 AnswersCameras4 years agoFind volume of solid of revolution of the curve y^2 = (x) (4-x)^2 about y axis.?
If I have to find the volume of solid of revolution about x axis, then it is easy because we know the expression of y in terms of x. But how to find the volume of the solid of revolution about y axis?
1 AnswerMathematics4 years agoUniversities in UK offering distance education in B.Sc. IT?
I am looking for some reputed universities in UK, which offer distance education in B.Sc. IT or B.Sc. Information Systems. The course should be completely online. Please suggest me some such UK universities.
2 AnswersStudying Abroad5 years agoa and n are two natural numbers. Prove that if a and n are relatively prime,?
then there exists a unique natural number b < n so that ab-1 is divisible by n
1 AnswerMathematics5 years agoWrite epsilon-delta proof to prove that lim(x->2) 4/x^2 = 1?
2 AnswersMathematics5 years agoLaptop items got rotated and display has become Mobile PC Display?
I have Windows 7 Home Basic installed in Lenovo laptop. Sometime back the desktop got rotated counterclockwise by 90 deg. May be some keys got pressed by mistake or may be Windows auto-installed something when I was not noticing.
Pressing Ctrl+Alt/=arrow key does not help. I went to Display Settings. But in display dropdown I see only one option: Mobile PC Display. How do I correct the rotation problem?
1 AnswerLaptops & Notebooks6 years agoHow to solve delu/delx + delu/dely = 0?
Note: del means partial derivative
Use separation of variables to solve the boundary value problem,
delu/delx + delu/dely = 0, u(0,y) = 3 e^(-y) + e^(-2y)
I put u(x,y) = F(x) G(y)
Then I got u(x,y) = F(0) G(0) e^k(x-y), where k is a constant.
From this I get u(0,y) = F(0) G(0) e^(-ky)
But don't know how to proceed after this.
2 AnswersMathematics7 years ago