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u hve a wedge and u place a block over it at the top.....the block will move down due to the incline of the wedge....now, will the wedge move back as the block comes down..or it will stay at its place....... ***normal is just ...

In how many ways can 20 identical balls be distributed among 9 children? i want to make it clear: *all 20 balls may not be distributed *each of them may not get a ball ...

I got this request today itself from 2 users.. Without revealing their identities, How to have a balanced sleep?? Due to the tough preparation, i suffer from severe lack of sleep after i started preparing hard! I slee ...

prove: 1+ 23/2! + 33/3! + 43/4! + + ........... = 5e ...

In a club election the number of contestants is one more than the max. number of candidates for which voter can vote.If the total number of ways in which a voter can vote be 62,then number of candidates= ...

The total number of natural numbers of 6 digits that can be made with digits 1,2,3,4 if all digits are to appear in at least once are........ ...

The number of numbers that can be formed by using the digits 1,2,3,3,3,2,1 so that odd digits always occupy odd palces is ...

The number and sum of divisors of the number 1800 which are proper and divisible by 6= ...

If a denotes the number of permutations of (x+2) things taken all at a time,b the number of permutations of x things taken 11 at a time and c the number of permutations of (x-11) things taken all at a time such that a=182 ...

If mn+1 pairs of letters are written down,each pair consisting of one chosen from the m letters a1,a2,....and the other from letters b1,b2,.....bn , then show that there are at least two pairs identical. ...

Out of 10 consonants and four vowels , the number of words that can be formed usiong six consonants and three vowels are....... ...

Two bodies A and B of masses m and 2m respectively are placed on smooth floor.They are connected by a light spring of stiffness k.A third body C of mass m moves with velocity v along line joining A and B collides elastically ...

Find the number of combination of n flowers of which p are identical taken r at a time.Does the answer depend on cases(i)r>p (ii)r<=p ...

A survey shows that 63% of americans like cheese whereas 76% like apples.If x% like both , find range of x ...

If 23 people sit around a round table,then prove that the unfavourable chance ratio of two particular pesons sitting together is 10:1 ...

*Image* ...

*Image* The opening near the bottom of the vessel shown in figure has an area A.A disk is held against the opening to keep the liquid from running out.Let F1 be the net force applied on the disc applied by liqiud an air in th ...

From a pack of cards two cards are taken out and thrown away. Now a card is drawn at random.Find the probability of the card to be an ace. ...

Draw curves for the following titrations....... 1)Strong acid-Strong base 2)Strong acid -Weak base 3)Weak acid -Strong base ...

check this website www.ebookee.com got a good collection of all sorts of books. I know it's illegal cheers. ...

In the definition of conics the fixed pt doesn't lie on the directrix but what will be the geometric figures if the fixed pt lie on the directrix for different cases i.e. 1) e<1 2) e=0 c)e=1 d)e>1 ...

3/4∫9/25dx/((1+√x) x-x2 ) ...

The auto ionization constant of liquid ammonia at -30°C is 10-33.Determine pNH2 of a 0.001M NH4Cl solution in iquid ammonia at -30°C ...

The anhydrous solids CuCl2 and CuBr2 are green and black coloured respectively while CuI2 is not stable even.Why? ...

Calculate the pH of the solution by mixing 50 ml of N-HCl and 30 ml of N-NaOH solution assuming both to be completely dissociated in normal solution. ...

1 .check whether the function defined by f(x+m)=1+ √[2f(x)-f2(x)] …..for all x E R is periodic or not. 2. Find all functions f satisfying the identity, f(x)+ f((x-1)/x)=1+x, …… for all xER-{0,1}. 3. Find the d ...

find the smallest area by y=f(x), when f(x) is a polynomial of least degree satisfying lim(x->0) [1+(f(x)/x^3)]^(1/x)=e, and the circle x^2+y^2=2 above the x-axis. ...

what is the least perfect square that when divided by 3 leaves 2 as remainder wen divided by 4 leaves 3 as a remainder and wen divided by 5 leaves 4 ...

In aerial mapping a camera uses a lens with a 100cm focal lenght.Find the height at which the airplane must fly,so that the photogrpah of a 1 km long strip on the ground fits excatly on the 20 cm long flimstrip of the camera. ...

find 0∫12x5tan-1x2dx ...