Recently Active Questions

heyy ppl..can sum1 tell me.how to concentrate in physscs...m done a lott wid chem n maths..but cant just study physics...any helpp????? ...

1) Show that for all positive reals a,b,c,d:- 1/a + 1/b + 4/c + 16/d>= 64/(a+b+c+d) 2) a,b,c are positive reals with abc=1. Prove that, 1/{a^3(b+c)} + 1/{b^3(c+a)} + 1/{c^3(a+b)}>= 3/2. 3) Solve the following inequality ...

\int _{0}^{(2n-1)\pi}[\sin x]dx;n\epsilon N Will this be done in same way as http://www.targetiit.com/iit-jee-forum/posts/find-the-value-11282.html ? :-) ...

Prove the value of integral \int _{0}^{1} \sqrt {1+x^3} is less than 7/2 ...

when released ,the mass 2m falls a distance x before the limp string becomes taut.thereafter both the mass on the left rise with the same speed.what is the final speed. *Image* i have applied impulse momentum theoram.but not ...

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If the tangent from a point P to the circle x^2+y^2=1 is perpendicular to the tangent from P to the circle X^2+y^2=3.Then find the locus of P.. ...

i have dbt regarding structures. *Image* ...

show that the equation secθ + cosecθ = c has two solutions between 0 and 2π if c2 < 8 and four solutions if c2 > 8. I've tried but didn't get the correct answer. ...

Find all 3 digit numbers with the property that abc=a!+b!+c! ...

Two soap bubbles of radius R1 and R2 are joined by a straw.Air goes from one bubble to another and a singel bubble of radius R3 is formed.What is surface tension of soap solution if the atmospheric pressure is P0 ? ...

Where is the center of gravity of a very long pole of length L placed vertically on the earths' surface.... (If you think that the answer is obvious.. Think again :P) ...

In triangle ABC equation of side BC is x-y=0.Circumcentre and Orthocentre of the triangle are (2,3) and (5,8) respectively.Find the equation of circumcircle of the triangle.. ...

A sphere made of 2 non identical homogenous hemispheres stuck together is placed on an inclined plane placed inclined at angle 30 to the horz.Can the sphere remain in equilibrium on inclined plane ? ...

*Image* a block of mass m is attached as shown .at equilibrium both the springs are compressed by same length if suddenly lower spring is cut. what is the accelaration of the block just after the spring is cut ...

∫dx/(1+x^16) i.e; x raised to 16, not the whole raised to 16. ...

iZ3+Z2-Z+i=0 then show that |Z|=1 plz tell me a shortcut for this problem........................ ...

find the range of the function not using differentiation (i.e maxima and minima not allowed ) :- f(x) = (sin2x + sinx - 1) / (sin2x - sinx +2 ) ...

plz explain and draw the graphof [sin2(x/4)+cos(x/4)] ...

Can anyone tell which of these following ligands are strong and which of them are weak? (1)CN- (2)SCN- (3)NO2- (4)NH3 (5)H2O (6)Pyridine (7)CO ...

Find the Orthocentre of the triangle ABC where A=(a cos x1,a sin x1) B=(a cos x2,a sin x2) C=(a cos x3,a sin x3) ...

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masses m1 and m2 both 10 kg are connected by a spring (k=100 N/m). Coeff of friction with ground is 0.04. wat is the minimum constant horizontal force to be applied on m1 to just move m2? ...

How many 1s are there in the result of 1 + 11 + 111 + ... + 11..111 (which is 2002 ones) ...

Please explain this question, how the solution has been obtained? *Image* ...

for what values of "m" is y=0,if y=x2+(2m+1)x+m2-1?x is a real number. ...

a problem similar to a few posted so far.... (Just for practice) What are the last digits of ? a) 22222222 10 times b) 333333 6 times c) 44444 5 times d) 7777777...... 8 times e) 888888 8 times... ...

What is the minimum distance between circle x2+y2=9 and curve 2x2+10y2+6xy=1? this was earlier done by kaymant sir in a way which didn't strike me,so get an easier method sir.. ...

1) Express the complex number 1 / [1 - (cos θ + i sin θ )] in the cartesian form. 2) Prove that [(1 + cos θ + i sin θ) / (1+cos θ)] n = cos n θ + i sin n θ. 3)(a)If c2+s2=1 ,then evaluate (1 + c + i s) / (1+c- i s) (b) ...

This turned up in 1 of the RMO's of WB region, I found it nice while solving, so flicked it here - Prove the sum 1/1001 + 1/1002 +.... 1/3001 lies between 1 and 4/3 . ...