Wednesday

October 22, 2014

October 22, 2014

Total # Posts: 77

**SCIENCE,PHYSICS**

3 is the answer Ohh brilliant cheateres rockzzz Calvin shokzzz Plz tell other answers to public
*July 4, 2013*

**geometry**

ABC is a triangle with AC=139 and BC=178. Points D and E are the midpoints of BC and ACrespectively. Given that AD and BE are perpendicular to each other, what is the length of AB?
*June 24, 2013*

**statics**

A bag contains 4 balls, each of which have a positive integer written on it. Let X be the random variable of the value written on a single ball drawn from the bucket. If E[X]=8, what is the maximum possible value of E[X^2]?
*June 24, 2013*

**geometry (help steve)**

A circle of radius 1 is drawn in the plane. Four non-overlapping circles each of radius 1, are drawn (externally) tangential to the original circle. An angle γis chosen uniformly at random in the interval [0,2π). The probability that a half ray drawn from ...
*June 24, 2013*

**physics**

An airplane of a certain density and shape flies at a constant speed. To do so, it must fly with a certain velocity v0. If the size of the airplane is scaled up in length, width, and height by a factor of two, it can only fly above a new velocity v1. What is v1/...
*May 27, 2013*

**physics**

Consider a horizontal road with such a set of traffic lights, each spaced 100 m apart. A car sits at the first traffic light. At t=0 the light turns green and the car accelerates. What is the maximum time t in secondsthe next light must turn ...
*May 27, 2013*

**physics**

P1/t1=p2/t2
*May 27, 2013*

**physics**

Many of you may have noticed the phenomenon that basketballs get flat if the weather is cold. If a basketball was inflated to a gauge pressure of 60,000 Pa when the temperature outside was 20∘C, what is the gauge pressure inside the basketball&...
*May 27, 2013*

**math**

wrong 326
*May 27, 2013*

**Geometry**

Find the number of 6 -term strictly increasing geometric progressions, such that all terms are positive integers less than 1000.
*May 16, 2013*

**physics**

Two point charges +q=1 μC and −q=−1 μC with mass m=1 g are fixed at the positions ±r⃗ 0 with |r0|=1 m. The charges are released from rest at t=0. Find the time &#...
*May 13, 2013*

**physics**

Three identical conducting spheres are located at the vertices of an equilateral triangle ABC. Initially the charge the charge of the sphere at point A is qA=0and the spheres at B and C carry the same charge qB=qC=q. It is known that the sphere B exerts an ...
*May 13, 2013*

**math**

He is correct only 1 integer satisfy he mean
*April 29, 2013*

**physics**

Lol brilliant cheaters wtf
*April 29, 2013*

**Geometry**

There are 100 runners, each given a distinct bib labeled 1 to 100. What is the most number of runners that we could arrange in a circle, such that the product of the numbers on the bibs of any 2 neighboring runners, is less than 1000?
*April 20, 2013*

**Maths**

yes it is 3
*April 12, 2013*

**Geometry**

What is a and what is b?
*April 11, 2013*

**Geometry**

If two six-sided dice are rolled, the probability that they both show the same number can be expressed as a b where a and b are coprime positive integers. What is the value of a+b ?
*April 11, 2013*

**Geometry(first one is typo)**

Let ƒÆ=sin −1 7/25 . Consider the sequence of values defined by a n =sin(nƒÆ) . They satisfy the recurrence relation a n+2 =k 1 a n+1 +k 0 a n ,n¸N for some (fixed) real numbers k 1 ,k 0 . The sum k 1 +k 0 can be written as p q , where p...
*April 11, 2013*

**Geometry**

Let ƒÆ=sin −1 7 25 . Consider the sequence of values defined by a n =sin(nƒÆ) . They satisfy the recurrence relation a n+2 =k 1 a n+1 +k 0 a n ,n¸N for some (fixed) real numbers k 1 ,k 0 . The sum k 1 +k 0 can be written as p q , where p...
*April 11, 2013*

**math**

ABC is a triangle with circumcenter O, obtuse angle BAC and AB<AC. M and N are the midpoints of BC and AO respectively. Let D be the intersection of MN with AC. If 2AD=(AB+AC), ...
*April 10, 2013*

**Geometry**

Convex quadrilateral ABCD has sides AB=BC=21, CD=15 and AD=9. Given additionally that ∠ABC=60∘, what is the length of BD?
*April 8, 2013*

**Probability**

A school is running a raffle for two prizes. 59 tickets were sold for the raffle, numbered 1,…,59. All the tickets are put into a hat and a teacher picks out two tickets which have numbers i and j from the hat. What is the expected value of |i−j|?
*April 8, 2013*

**maths**

I got it till now maximize a+b, if Re (b)=-Im(a), Re (a)-21 <Im (b)<Re (a)-5 So find max a+b
*April 3, 2013*

**maths**

A group of 5 people are going to meet weekly at the library for 4 weeks. Each week, two people are selected at random to speak. Each person may speak in multiple weeks, but no pair of people will speak together more than once. The probability that there is a person who will ...
*April 2, 2013*

**Physics**

The fundamental frequency of the G string of a guitar is f=196Hz. The fundamental vibrational mode of the string is described by the standing wavey(t,x)=acos(2πft)sin(πxL)where L=65cm is the length of the string and a=1mm is the amplitude of ...
*April 1, 2013*

**maths**

A group of 5 people are going to meet weekly at the library for 4 weeks. Each week, two people are selected at random to speak. Each person may speak in multiple weeks, but no pair of people will speak together more than once. The probability that there is a person who will ...
*April 1, 2013*

**maths**

Find the number of different ordered quadruples (a,b,c,d) of complex numbers such that a^2=1 b^3=1 c^4=1 d^6=1 a+b+c+d=0
*April 1, 2013*

**maths**

thanks
*April 1, 2013*

**maths**

Find the largest possible value of x^3+y^3+z^3 for realx, y, z, such that xyz^2=−64y−128x x^2yz=−32y−32z 3xy^2z=128x−64z
*April 1, 2013*

**maths**

ABC is an acute triangle with ∠BCA=35∘. Denote the circumcenter of ABC as O and the orthocenter of ABC as H. If AO=AH, what is the value of ∠ABC(in degrees)?
*March 30, 2013*

**Algebra**

Strange r meets stranger
*March 26, 2013*

**Algebra**

As x ranges over all real values, what is the minimum value of f(x)=|x-123|+|x-456| + |x-789|
*March 26, 2013*

**Physics/math**

Can't get it, Didn't studied this topic, Would you please work the solution.
*March 25, 2013*

**Maths Probability**

When writing a math expression, any time there is an open bracket "(", it is eventually followed by a closed bracket ")". When we have a complicated expression, there may be several brackets nested amongst each other, such as in the expression (x+1)∗...
*March 25, 2013*

**GEOMetry(TRIANGLE)**

how
*March 25, 2013*

**Trigonometry**

Every point (x,y) on the curve y=log(3x)/log2 is transferred to a new point by the following translation (x′,y′)=(x−m,y−n), where m and n are integers. The set of (x′,y′) form the curve y=log(12x−96)/log2. What is the value of m+n? ...
*March 25, 2013*

**calculas**

At time t=0 s, the radius of a circle is equal to 15 cm. The radius of the circle increases at a rate of 0.5 cm/s. The rate of change of area at t=20 s is equal to mπ cm^2/s, where m is a positive integer. ...
*March 22, 2013*

**algebra**

Let no. of men be x No. of women = 5x + 2 Total students = No. of men + women 50=x + 5x+2 48=6x x=8 No. of women = 5x + 2 = 5 * 8 + 2 =42 (ans)
*March 19, 2013*

**Physics help ASAP please**

No direction no length of river how broad river is then how to find?
*March 19, 2013*

**Math**

700 $ make 42281 $ in ten years Totally wrong this cant be true He had invested money that will be get in a collection not in payment
*March 19, 2013*

**Math**

This Compound interest using Amount = principle * ((Rate + 100)/100)^time Here Rate is per time period i.e 8% per annum will be 2% per quater Time period is 10 years = 40 quater year P=700 $ Putting values Amount = 700 * ((2+100)/100)^40 =700 * (51/50)^40 using scientific ...
*March 19, 2013*

**math**

30 + 20/((1*5)*2) since 1*5 = 5 and 5*2 = 10 this become 30 + 20/10 30+2 32
*March 19, 2013*

**math**

how
*March 19, 2013*

**math**

25 independent, fair coins are tossed in a row. What is the expected number of consecutive HH pairs? Details and assumptions If 6 coin tosses in a row give HHTHHH, the number of consecutive HH pairs is 3.
*March 19, 2013*

**Arithmetic**

B-1/2 Let no. of books be x No. of history books equal x into 1/3 I.e.x/3 No. Of English books equal x into 1/3 I.e. x/6 Rest books = no. Of science books =total books -(history books+English books) =×-(×/3 +×/6) =x-(3x/6) =x-x/2 =x/2 books are of science of ...
*March 19, 2013*

**Maths**

ABC is a right angled triangle with ∠ABC=90∘ and side lengths AB=24 and BC=7. A semicircle is inscribed in ABC, such that the diameter is on AC and it is tangent to AB and BC. If the radius of the semicircle is an improper fraction of the form a/b, where a and b ...
*March 19, 2013*

**Trigonometry**

Suppose N = xyzyx, where x is nonzero but y and z could be any digit. Then there are 9(10^2) = 900 possible palindromes to consider. Recall that a number is divisible by 4 iff its last two digits are divisible by 4. Thus, if N is divisible by 4, then "yx" must be of ...
*March 18, 2013*

**Mathematics**

Try to use remainder therom reverse it from divident subtract remainder then divide with no remainder ans will come
*March 18, 2013*

**Combinations Maths**

okk
*March 18, 2013*

**Combinations Maths**

25 independent, fair coins are tossed in a row. What is the expected number of consecutive HH pairs? If 6 coin tosses in a row give HHTHHH, the number of consecutive HH pairs is 3.
*March 18, 2013*

**Combinations Maths**

For how many positive integers n are there exactly ⌊n/2⌋ or ⌈n/2⌉ primes less than or equal to n?
*March 18, 2013*

**Geometry**

BC is a triangle with ∠BAC=60∘,AB=5 and AC=25. D is a point on the internal angle bisector of ∠BAC such that BD=DC. What is AD^2? It is not stated that D lies on BC. This assumption is not necessarily true.
*March 18, 2013*

**Geometry**

ABC is a right angled triangle with ∠ABC=90∘ and side lengths AB=24 and BC=7. A semicircle is inscribed in ABC, such that the diameter is on AC and it is tangent to AB and BC. If the radius of the semicircle is an improper fraction of the form a/b, where a and b ...
*March 18, 2013*

**Number theroy**

What is the 50th smallest positive integer that can be written as the sum of distinct non-negative integer powers of 3?
*March 18, 2013*

**Algebra**

Let S(N) denote the digit sum of the integer N. Let M denote the maximum value of N/S(N), where N is a 3-digit number. How many 3-digit numbers N satisfy N/S(N)=M? The digit sum of an integer is the sum of all its digits. For example, the digit sum of N=1123 is 1+1+2+3=7.
*March 18, 2013*

**Algebra**

We define n♡ recursively as follows. 1♡=1; n♡=((n−1)♡)⋅n+1 Find the largest n<1000 such that the last two digits of n♡ are zeroes. Just to make it clear: unlike "n-factorial," "n-heart" is NOT an official ...
*March 18, 2013*

**Algebra**

How many positive integers n≤1000 cannot be written in the form a2−b2−c2 where a,b and c are non-negative integers subject to a≥b+c?
*March 18, 2013*

**Slope Maths**

What is the slope of the line tangent to the quadratic f(x)=4x^2−3x+6 at x=7?
*March 18, 2013*

**Limit Math**

Evaluate lim x→∞ 2x/(√(x^2+3)-4) in words 2x divide by(root(xsq +3) -4)
*March 18, 2013*

**Trignometry**

ABCD is a square where M and N are midpoints of AD and CD, respectively. If sin∠MBN=a/b, where a and b are coprime positive integers, what is the value of a+b?
*March 18, 2013*

**Trignometry**

Let m and M be the minimum and maximum values of the domain of f(x)=sin^−1(x2−35), respectively. What is the value of M−m? sin^-1 is sin inverse
*March 18, 2013*

**Trignometry**

The angles in triangle ABC satisfy 6sin∠A=3√(3)sin∠B=2√(2)sin∠C. If sin^2∠A=a/b, where a and b are coprime positive integers, what is the value of a+b?
*March 18, 2013*

**Algebra**

The function f(x)=x^4−10x^3+40x^2−80x+64 has four complex roots, one of which is 2−2i. What is the sum of all real and imaginary coefficients of these roots? i here is imaginary unit i.e. i^2 = -1
*March 18, 2013*

**Algebra**

A is a 2 by 2 matrix. Given that A=(5 1) (1 5) , what is the value of det(A)? det(A) is determinant of A
*March 18, 2013*

**Physics**

A 80 kg climber is standing horizontally on a perfectly vertical cliff face. The climber is 1.8 m tall and is attached by a 2 m long rope fastened around their middle to a point on the cliff above them. What is the normal force the cliff face exerts on the climber in Newtons? ...
*March 18, 2013*

**Physics**

i could not get there hw to put angle
*March 18, 2013*

**easy algebra!**

10
*March 18, 2013*

**physics**

0.0928 kg
*March 18, 2013*

**algebra**

Let x = side of square to cut off from each corner 20 - 2x = width of bottom rectangle 28 - 2x = length of bottom rectangle V = x(20 - 2x)(28 - 2x) = 4x(10 - x)(14 -x) = V = 4x(140 - 24x + x²) V = 4(140x - 24x² + x³) Differentiating and equating to zero dV/dx = ...
*May 9, 2012*

**Calculus**

Oops, sorry about that, the correct answer is 7 (4 * 6) + (5 * -2) + (-1 * 7) 24 + (-10) + (-7) 14 + (-7) 7 7.
*May 9, 2012*

**Calculus**

The Dot Product is a scalar (number) (4 * 5) + (5 * -2) + (-1 * 7) 20 + -10 + -7 10 + -7 3 3.
*May 9, 2012*

**Psychology**

According to Freud, defense mechanisms are protective methods, by the ego, that reduce anxiety by unconsciously distorting reality. Definitions & Examples: Repression - banishing anxiety-arousing thoughts, feelings, and memories from consciousness. e.g. blocking out your ...
*May 9, 2012*

**Math**

There are 16 oz in 1 lb. So, 1 lb 4 oz = (1 * 16) + 4 = 20 oz -- Each day, Robert feeds his dog 20 oz If the bag is 40 lbs, and 1 lb = 16 oz -- The bag is 640 oz 640 oz of food, divided by 20 oz servings -- It will last 32 days.
*May 8, 2012*

**choice**

Healthy behaviors and choices are decisions made when one is conscience of their overall health status, and thus will lead to minimized negative consequences. Overtime, this will positively affect an individual's health status. Conversely, behaviors that are unhealthy ...
*May 8, 2012*

**math**

2 & 3 are both factors of 6. Meaning whenever 6 goes in a set, it can be replaced by two 3's or three 2's. 6 * 4 6 * 3; 3 * 2 6 * 3; 2 * 3 6 * 2; 3 * 4 6 * 2; 2 * 6 6 * 2; 3 * 2; 2 * 3 6 * 1; 3 * 6 6 * 1; 2 * 9 6 * 1; 3 * 4; 2 * 3 6 * 1; 3 * 2; 2 * 6 6 * 0; 3 * 8 6 * 0...
*May 8, 2012*

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