Sunday

December 21, 2014

December 21, 2014

Total # Posts: 74

**math**

Two trains are on the same track a distance 100 km apart heading towards one another, each at a speed of 50 km/h. A fly starting out at the front of one train, flies towards the other at a speed of 75 km/h. Upon reaching the other train, the fly turns around and continues ...
*December 7, 2014*

**geometry**

Two circles which are not congruent touch externally. the sum of their area is 130¦Ðcm.square and distance between their centers is 14 cm. find radii of circles.
*September 28, 2014*

**geometry**

triangle ABC have angle ABC 90 degree. therefore the triangle ABC is right angled triangle. Therefore, In triangle ABC, by phyathagoras theorem, AC ¡Á AC =AB¡ÁAB BC ¡ÁBC AC ¡Á AC = 5¡Á5 12¡Á12 = 25 ...
*September 28, 2014*

**PHYSICS**

hey have u got this@Anonymous
*November 8, 2013*

**math**

a+boundary+wall+of+your+house+is+divided+in+to+10+vertical+strips+of+equal+width+you+painted+4+strips+of+wall+with+pink+3+with+yellow+and+3+strips+with+green+paint+find+the+percentage+area+of+wall+painted+with+pink+colour
*October 27, 2013*

**Chemistry**

A reference solution is to be prepared with 5 PPM parabenzopyrene (molecular weight = 252). The quantity of parabenzopyrene required for preparing one litre 5 PPM solution is (A) 252 mg (B) 25.2 mg (C) 5 mg (D) 252 g
*June 25, 2013*

**math**

then wats the answer
*June 15, 2013*

**algebra!!!! please help me!!!!**

as we have to chose positive odd integers sp we cant choose maximum big numbers close to 1 its choose w=3 x=3 then y=5 z=7 then answer is minimum is 1/45 or 1+45=46
*June 14, 2013*

**pls heeelp math**

answer is 6/11 or 11+6= 17
*June 7, 2013*

**maths**

Determine 208/207+208/207×206/205+208/207×206/205×204/203+…
*June 5, 2013*

**maths**

Find the smallest number N such that: The number of divisors of N is A. The number of divisors of A is B. The number of divisors of B is C. The number of divisors of C is 3.
*June 5, 2013*

**maths**

419.....go and get points
*June 4, 2013*

**Geometry and combiantorics.**

yes randy morico is correct
*June 3, 2013*

**math**

820
*May 27, 2013*

**maths**

How many functions f from the reals to the reals are there, such that f(f(x))=x^2−2? Details and assumptions f need not be a polynomial. f need not even be continuous.
*May 21, 2013*

**maths**

How many positive integers n are there such that 10^n≤n^10?
*May 16, 2013*

**maths**

What is the smallest positive integer with exactly 12 (positive) divisors?
*May 16, 2013*

**algebra**

can u explain how?
*May 13, 2013*

**algebra**

thx
*May 13, 2013*

**physics**

Earthquakes are motions of the earth's crust. Essentially, they are big sound waves that travel through the earth. There are two types of waves. The first type is called a longitudinal or P wave, where the earth compresses in the same direction as the wave travels. The ...
*May 9, 2013*

**Physics**

thank you
*May 6, 2013*

**math**

As θ ranges over all real values, what is the maximum value of (14sinθ+5cosθ)^2
*May 3, 2013*

**maths**

On children's day, a teacher brought 63 erasers and 147 sweets to distribute out completely to her class. Each student receives the same number of erasers as each other, and the same number of sweets as each other. What is the most number of students in the class? Details ...
*April 18, 2013*

**Physics :(( help please TT**

the answer is 5.91
*April 16, 2013*

**maths**

As x,y,z ranges over all possible real numbers, what is the minimum value of 3x^2+12y^2+27z^2−4xy−12yz−6xz−8y−24z+100?
*April 13, 2013*

**maths**

Find the number of positive integers <1000 that can be expressed as 2^k−2^m, where k and m are non-negative integers.
*April 12, 2013*

**maths**

What is the sum of all integer values of n such that 3n+15/(n−1)(n−5) is also an integer
*April 10, 2013*

**maths**

Suppose z=a+bi, where a and b are integers and i is the imaginary unit. We are given that |1+iz|=|1−iz| and |z−(13+15i)|<17. Find the largest possible value of a+b. Details and assumptions i is the imaginary unit, where i^2=−1.
*April 3, 2013*

**physics**

thankyou
*April 1, 2013*

**physics**

You and your friend, both of mass 70 kg, are playing catch with a frisbee on frictionless ice. Initially, you are both at rest. You throw a 0.175 kg frisbee at 10 m/s horizontally at your friend, who catches it. After they catch the frisbee, what is the relative velocity ...
*April 1, 2013*

**maths**

The probability that Katarina will correctly solve a given Brilliant math problem is 1/8. The probability that Layla will solve the same problem correctly is 1/12. The probability that they will give the same incorrect numerical result is 1/1001. Suppose Katarina and Layla ...
*April 1, 2013*

**maths**

Three coins are randomly placed into different positions on a 4×10 grid. The probability that no two coins are in the same row or column can be expressed as ab where a and b are coprime positive integers. What is the probability of a+b?
*April 1, 2013*

**maths**

x,y and z are positive reals. What is the maximum value of ((x+y+z)^3−x^3−y^3−z^3)^2/(x^2+y^2+z^2)^3−x^6−y^6−z^6
*April 1, 2013*

**maths**

Let f(x)=x^2−1. How many distinct real roots are there to f(f(f(x)))=0?
*April 1, 2013*

**maths**

What is the largest possible integer that can be chosen as one of five distinct positive integers whose average is 10? Details and assumptions The elements of a set are distinct, if no two of them are the same.
*April 1, 2013*

**physics**

A current I=1A flows along a thin-walled cylinder of radius R=4cm. What pressure in Pascals do the walls of the cylinder experience? Assume that the current is uniformly distributed. Bonus thing to think about: Is this pressure directed inwards or outwards?
*March 30, 2013*

**physics**

Two parallel wires carry 1-A currents in unknown directions. The distance between the wires is 10-cm. What is the magnitude of the magnetic field B in Teslas at a point P located 6-cm away from the axis of one of the wires and 8-cm away from the axis of the other wire? Unot=...
*March 30, 2013*

**maths**

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

**physics**

It should be 0.009
*March 22, 2013*

**maths**

the answers wrong.........
*March 22, 2013*

**maths**

What is the smallest positive common difference of a 6-term arithmetic progression consisting entirely of (positive) prime numbers?
*March 21, 2013*

**physics**

The sun goes around the center of our galaxy once every 250 million years. The sun is also 2.55×10^20 m from the center of our galaxy. What is the acceleration of our sun towards the center of the galaxy in m/s^2?
*March 21, 2013*

**calculus**

A moving dot P departs from O at an initial speed of 6 m/s in the east direction and accelerates at 2 m/s^2 in the east direction. 2 seconds after P's departure, dot Q departs from O to chase down P at a constant speed of k m/s in the east direction. What is the minimum ...
*March 21, 2013*

**calculus**

What is the slope of the line tangent to the quadratic f(x)=4x^2−3x+6 at x=7?
*March 21, 2013*

**maths**

How many integers appear in both of the following arithmetic progressions: A1:2,9,16,……,2+(1000−1)×7 A2:3,12,…,21,…,3+(1000−1)×9 Details and assumptions Since 2 appears in A1 but not in A2, it does not appear in both of the ...
*March 21, 2013*

**maths**

Find the sum of all 3-digit positive numbers N that satisfy the condition that the digit sum of N is 3 times the digit sum of N+3. Details and assumptions The digit sum of a number is the sum of all its digits. For example, 1123 has a digit sum of 1+1+2+3=7. The number 12=012 ...
*March 21, 2013*

**geometry help!!**

thank you
*March 13, 2013*

**Dynamics**

A car travels around a horizontal circular track of radius 45m.If the car increases its speed at a constant rate of 1.2m/s2 starting from rest, determine the time needed for it to reach an acceleration of 1.4m/s2. What is its speed at this instant?
*August 6, 2012*

**math**

underoot 2x square +3x + underoot 2 by alpha into beta method.
*May 3, 2012*

**math**

if x3+ax2-bx+10 is divisible by x2-3x+2 .find the value of a and b
*April 15, 2012*

**Maths**

Find the radius of a right circular cyilender whose volume is 3080cu.cm and height is 20cm.
*February 3, 2012*

**dav**

determine the concentrated of mohrs salt solution with the help of supplied n/10 kmno4 solution preparred?
*May 4, 2011*

**Maths**

'a' and 'b'are integers and (a, b) = 2. Solve the following two equations: (a+b)^2 = 25a 18(a^4) + (b^4) = 41a(b^2) Can't get it, help please?
*January 4, 2011*

**pre algebra **

Let steve = x, therefore ramon = 3x x + 3x = 104 4x = 104 x = 26 Therefore steve earned $26 Ramon = 3 * 26 = $78
*January 4, 2011*

**algebra**

a) 7m + 36 = 11m -4m = -36 m = 9 b) 2x + 4 = 10x - 4 -8x = -8 x = 1 c) 11w - 8 = 22 - w 12w = 30 w = 5/2 d) 6a - 12 - a = 9a + 53 + a 5a - 12 = 10a + 53 -5a = 65 a = -13
*January 4, 2011*

**Math**

integrate (sin^8 x - cos^8 x)/(1 - 2sin^2 x * cos^2 x) w.r.t. x
*January 2, 2011*

**Math**

evaluate r. if12Pr=1320
*June 3, 2010*

**Math**

evaluate r. 12Pr=1320
*June 3, 2010*

**grammar**

D.R MAN MOHAN SING IS THE PRIME OF INDIA
*May 27, 2010*

**algebra II**

First, you know the formula is a^2 + b^2 = c^2. Next, substitute the values: a^2 + 1^2 = root 10 ^2 Do the operations. a^2 + 1 = 10 Now= a^2 = 10-1 a^2 = 9 a = 3
*April 15, 2010*

**3rd grade**

4 hundreds 3 tens 3 ones= 433 4 hundreds 3 tens 5 ones= 435 Count with me. 433, ..., 435 ANS: 434
*April 12, 2010*

**computers**

what computers can do?what computers cannot do?what are the advantages and disadvantages of computers?what are the roles of computer in the society?
*October 24, 2008*

**scince maths**

1- What volume of hydrogen gas at 273 K and 1 atm pressure will consumed in obtaining 2.16 gm of elemental born(atomic mass=10.8)from the reduction of born trichloride by hydrogen: A- 44.8 lit B-22.4 lit C- 89.6 lit D-67.2 lit
*May 27, 2008*

**astronomy**

The parallax of the red giant Betelguese is just barely measurable and has a value of about 0.005 arc seconds. What is its distance? Suppose the measurement is in error by + or -0.003 arc seconds. What limits can you set on its distance? 1/0.005 = 200 parsecs. Convert that to ...
*April 30, 2007*

**astronomy**

Arcturus is about half as hot as the Sun but is about 100 times more luminous. What is its radius campared to the sun. If Arcturus is half as hot, it radiates (1/2)^4 = 1/16 as much as the sun PER UNIT AREA. But since it radiates 100 times more totally, it must have 1600 times...
*April 30, 2007*

**astronomy**

The parallax of the red giant Betelguese is just barely measurable and has a value of about 0.005 arc seconds. What is its distance? Suppose the measurement is in error by + or -0.003 arc seconds. What limits can you set on its distance?
*April 27, 2007*

**astronomy**

Arcturus is about half as hot as the Sun but is about 100 times more luminous. What is its radius campared to the sun.
*April 27, 2007*

**Economics**

what it meant by equilibrium in economics?how equilibirum attained? The following site has an ok defintion. (I cannot post the site: instead google economics, equilibrium, definition) Market equilibrium occurs when buyers and sellers, each acting in their own best interest, ...
*April 26, 2007*

**science**

Which of the following is a example of a irriversible change. a)Disssolve salt in water b)Freezing water C)Mixing water-colour Which do you think you can't separate? Can you separate salt after it is dissolved in water? I think I could evaporate the water and leave the ...
*April 21, 2007*

**PHYSICS**

hf=Hi + Vsin45*t - 4.9 t^2 (v sin 45)t = 1.05 + 4.905 t^2 ___ (1) (v cos 45)t = 10 ___ (2) (2)/(1): 10 tan 45 = 1.05 + 4.905 t^2 Solve for t, t = 1.35 s Substitute t in (2), (v cos 45)1.35 = 10 v = 10.47 m s^-1
*November 1, 2006*

**geography**

are alps bigger or mountains?or wat's the difference between them? Alps are mountains in one specific geographic region. It is a historic name, there is no difference between the geography of "alps" and "mountains". need a definition of tall grass in ...
*October 29, 2006*

**geography**

whr do cattles and sheep live like in high altitudes or middle or low altitudes? Cattle need food, water, and a temperature range that does not cook, nor freeze them. So if you choose to examine an altitude, check to see if those are available. If so, cattle and sheep can ...
*October 29, 2006*

**Math**

Proove that half of 9 is 4...i know the answer i am just chking whether u all know the answer or not..;P if u cut IX in halves(horizontally)...u'll get IV n=56 if n=11
*October 4, 2006*

**Math quiz**

Proof that half of 9 is 4.. uhm..it's proove instead of proof need a clue?
*September 27, 2006*

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