Thursday
April 24, 2014

Posts by abcd


Total # Posts: 59

Physics
In a relay race the second runner does not start from rest. it covers 100 m in 10 sec, finishing with maximum velocity of 12 m/sec, assuming the constant acceleration, determine his initial velocity. ??

Physics
any one Q2_2_5

Physics
any one Q2_2_5

Maths
Mariolys is creating a numbered list of distinct integers. Luigis sees that there are N numbers in the list, and states that he can find either a subsequence of length 13 with increasing terms or a subsequence of length 17 with decreasing terms. What is the minimum value of N ...

Maths
Points A,B,C are given on circle Γ such that AB=BC. The tangents at A and at B intersect again at point D. The line CD intersects Γ again at E. The line AE intersects BD at F. If AD=120, what is the length of FB.

Maths
Given the set of integers {1,2,3,…,801}, what is the maximum number of sets we could distribute these numbers into such that the sum of each set is exactly the same.

Maths
Let S be a set of 31 equally spaced points on a circle centered at O, and consider a uniformly random pair of distinct points A and B (A,B∈S). The probability that the perpendicular bisectors of OA and OB intersect strictly inside the circle can be expressed as m/n, wher...

Maths
Find the number of pairs of non-negative integers (n,m), such that 1≤n<m≤100, n∣m2−1 and m∣n2−1. Details and assumptions The notation a∣b means a divides b, or b=ka for some integer k.

Maths
Find the denominator n of the rational number kn (k,n are both integers) such that ∣Root 2 - k/n∣ is the smallest possible, out of all rational numbers with denominator less than 1000?

Maths
Let A0=(−1,0), and let O be the origin (0,0). For each integer i≥1, we construct the point Ai so that |Ai−1Ai|=|Ai−1O| and the angle ∠OAi−1Ai is a right angle. If O,Ai−1,Ai+1 are not collinear for any value of i, what is the x-coordina...

Maths
Let x,y,z be non-negative real numbers satisfying the condition x+y+z=1. The maximum possible value of x^3y^3+y^3z^3+z^3x^3 has the form ab where a and b are positive, coprime integers. What is the value of a+b?

Maths (Geometry)
P is a point in rectangle ABCD. The distance from P to the 4 vertices of the rectangle are 7,15,24 and N in some order. If N is an integer, determine the value of N.

Physics
That's easy. From the given conditions, height= length/2

Math/Geometry
Two circles of radius r1 and r2 are extenally tangential to each other and are also externally tangential to a staight line l. Another circle of some unknown radius is externally tangential to both the circles and to the straight line l. Find the adius of that circle.

physics
We know how to calculate the total resistance of the cylindrical conductor given its length, radius, and resistivity. But how do we calculate the equivalent resistance when the resistivity is not constant? For example, say the resistivity at a particular point at a distance x ...

Geometry
Yes, solving gives HI^2= 792.

maths
This problem is at an website (brilliant . org). Please don't answer this since the problem is open. Answer this the next week.

chemistry 101
given the reaction: 2mg + o2-----> 2mgo . when 4.32g of oxygen react with magnesium 327kj of energy is produced. the heat of reaction for 1 mole of oxygen is???

chemistry 101
What is the coefficient for aluminum after the following equation is balanced: Al(s) + O2(g) --> Al2O3(s) options: 2 4 1 3 0

chemistry 101
so whts th answer from th options??

chemistry 101
Given the following dissolving process: Fe2(SO4)3 (s) = 2Fe3+ (aq) + 3SO42- (aq) How many grams of iron (III) ions are produced when 0.450 moles of sulfate ion are produced? options: 50.3 g 16.8 g 50.3 g 37.7 g 75.4 g

chemistry 101
Consider the following reaction. CaO (s) + CO2 (g) = CaCO3 (s) A chemist allows 14.4 g of CaO and 13.8 g of CO2 to react. When the reaction is finished, the chemist collects 19.4 g of CaCO3. Determine the limiting reactant, theoretical yield, and percent yield for the reactio ...

chemistry 101
How many grams of oxygen are in 40.1 g of calcium hydroxide? options: 17.3 g 8.64 g 20.1 g 0.541 g 11.2 g

chemistry 101
Lakes that have been acidified by acid rain can be neutralized by the addition of limestone (CaCO3). How much limestone in kilograms would be required to completely neutralize a 5.2 x 109 L lake containing 5.0 x 10-3 g of H2SO4 per liter?

chemistry 101
How many molecules of oxygen are produced from the decomposition of 8.75 g of hydrogen peroxide in the following equation Mg + H2O2 --> MgH2 + O2 options: 8.75 x 1024 6.02 x 1023 1.55 x 1022 5.27 x 1024 1.55 x 1023

chemistry 101
How many moles of oxygen are in 3.45 mol of diphosphorus pentoxide? options: 5.75 mol O 13.5 mol O 6.90 mol O 3.45 mol O 17.3 mol O

chemistry 101
Determine the empirical and molecular formula for a compound made from 54.09% calcium, 2.72% hydrogen, and 43.18% oxygen with a total molar mass of 222.3 g.

chemistry 101
Calculate the empirical formula for the following compound: potassium tartrate found in baking powder: 20.8% K, 2.7% H, 25.5% C, and 51.0% O

chemistry
Benzene, C6H6, is a known carcinogen that burns in air according to the following unbalanced equation: C6H6(l) + O2(g)  CO2(g) + H2O(g) a. What is the mole ratio of O2 to C6H6? b. How many moles of O2 are required to react with each mole of C6H6? c. How many moles of O...

chemistry
Suggest chemical reactions that could be used to identify the contents of four unlabeled bottles containing solutions of the following substances: CuSO4, Al2(SO4)3, Pb(NO3)2, and FeSO4.

chemistry
Predict whether reactions should occur between aqueous solutions of the following compounds. If so, write balanced molecular and net ionic equations for the reactions. Include physical states. a. (NH4)2CO3 and CrCl3 b. Ba(OH)2 and HCl c. FeCl3 and NaOH d. Ca(HCO3)2 and HNO3

chemistry
Consider the following equations. For each, decide whether it represents a chemical reaction or a physical change. a. SnCl4(aq) + 4H2O(l)  Sn(OH)4(s) + 4HCl(aq) b. 4K(s) + O2(g)  2K2O(s) c. NaCl(s)  Na+(aq) + Cl-(aq)

English - Shakespeare
Thanks

English - Shakespeare
In "Othello" Desdemona is slapped by Othello in Act 4 Scene 1. Why soesn't she defend herself eventhough she's innocent? I was thinking that maybe she was just too stunned to do anything or maybe she thought that something was wrong such as he was ill or he w...

math riddle
A robber ducky

math
Thanks

math
Can anyone help, my calculator does not have enough space for simplifying this, sqrt[(16*10^113)/250*10^-28]

algebra
Just add the two together as they are then divde the term with no variable by the one with a variable to get your answer.

algebra
y=5/3X-4

math
Ah, thank you. I was thinking that 5 had to be divided into squares but it is prime.

math
It's impossible to factor x^2-6x+5 right?

math
ok thanks

math
Sorry this was meant for Reiny

math
nevermind

math
Are you sure that (2x+1)(x+3) is the factored version of 2x^2+5x+3?

math
oh that's what you mean. I guess we call it something different. Thanks

math
Not really

math
What factoring technique would be used to factor 2x^2+5x+3?

religion and social studies
I would have to say because religion has been an integral part of society since humans have lived. Social studies is studying society, people, customs, etc.

jewerly marking
I believe it is Continental silver. Yaahoo 82.5% silver and choose 3rd link

algebra
Subtract 2cm from 16cm and then divide that number by 2. After that multiply it by 5.

math
Thanks, I hope thats it.

math
Last question. If I have found all of the linear equations and have all of the intersection points for this feasible region, how do I calculate the maximum and minimum using the given function f(x,y)=-x+3y?

Biology
1.Cytosol is the liquid found within a cell, so I would say D. BUT cytoplasm is actualy the cytosol + organelles. This would make D. and E. the same so I would say A. none of these. 2.Prokaryotic cells divide by binary fission. Although this is the way bacteria divide they tec...

math
Thanks, I appreciate the help.

math
Pertaining to the previous question, if two of the vertices of a feasible region are at (1,3) and (6,1) how would the linear equation representing a line connecting them be found?

math
Thanks

math
How would the maximum and minimum values of a feasible region be found with a given function such as f(x,y)=-x+3y?

Drama
What are the techniques used in improv? I am assuming that you a refering to improvisational comedy rather than music or other areas. Since this is not my area of expertise, I searched Google under the key words "improv techniques" to get these possible sources: http...

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