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Can friction do positive work? If yes explain with an example? If friction can do positive work, then (from work-energy theorem) friction can increase the kinetic energy of an isolated system. Give your views on this statemen ...

please tell me xact defination of hydrostatic paradox? ...

*Image* A disc of mass M and radius R is lying on a smooth horizontal surface.A particle of mass M moving horizontally with a velocity V collides with the disc at B and sticks to it.Speed of point A on the disc just after imp ...

A wire of length l is bent into shape of an n sided regular polygon .If its mass be m , determine its polar M.I. about its centroid. Also find the M.I., in the limiting case as n-->∞ ...

Sorry, the right question is:- "The sides AB & AC are bisected at right angles by the pair of straight lines y2-5xy-4x2=0. The base BC of the triangle passes through a fixed point (4,5). Here, AB, AC & BC are the sides of a t ...

e- Π/2 <θ< Π/2 the larger of cos(logθ) and log(cosθ) if e- Π/2 <θ< Π/2 is ____ ? ...

ABC is a triangle inscribed in the circle z = r whre z is a complex no. and r is the radius of the circle. the internal bisector of angle A and the altitude from A on BC meet the circle at D and E respectively. F is the foot ...

In how many ways can the letters of the word "C O M M I S S I O N " be arranged without changing the order of vowels ? ...

An engineer claims to have developed an engine which develops 3.4 kW while consuming 0.44 Kg of fuel of calorific value of calorific value of 41870 kJ / kg in one hour. The maximum and minimum temperatures recorded in the cyc ...

\sum_{n=0}^{\ \propto }{1/(3n+1)-1/(3n+2)} ...

5 balls of different colours are to be placed in 3 boxes of diff. sizes. Each box can hold all 5. In how many different ways can we place the balls so that no box is empty ? ...

more than one correct Q1 if a,b,c in Ap and a≠b then b-c/a-b= ?? a) 2 b) 3 c)1 d)3 Q2 if x1,x2,x3 are positive and unequal real numbers such that 2x1,2x2,2x3are in gp then find range of ( x1.x3/x22 )1/2 Q3 if if p,q,r in gp ...

Q1 Change in vol delta V on mixing acetic acid (A) and benzene (B) is plotted against %benzene *Image* a)A-B bon dweaker than either A-A bond or B-B bond b)A-A bond is weaker than B_B bond c)B-B bond is weaker than A-A bond d ...

Very simple problem. 75.2 g of phenol is dissolved in solvent of Kf = 14, if the depression in freezing point is 7 K. What is the % of phenol ? ...

Structures of (SiH3)3N and (CH3)3N are the different - Why? ...

why the reaction 194 0 194 Au + e -------> Pt 79 -1 78 is called K electron capture????????? ...

Equal volumes of acid, 1M HA and acid 1M HB are mixed. Ka for acids are respectively, 10-4 and 4*10-4. Find the pH of the resultant solution. ...

Can anyone please explain the following processes for manufacture of steel in simple lines. [1] (1) Bessemer Process (2) Open Hearth Process (3) L.D. Process ...

1) Among the following, the one having highest enthalpy of hydration is - a)H+ b)Li+ c)Be 2+ d)Al 3+ 2) For the balanced redox reac.n - aNO3- + bAs2S3 +4H2O -------> xAsO4-3 + yNO + z3SO4 2- + 8H+ Identify the Incorrect st ...

1.... why gamma rays do nt effect photographic screen despite hving high frequency ?????/ is it due to their non material nature????..........wat are constituent particles of gamma rays???? ...

Given a sample pf Radium-2008 having half life of 4 days. Find the probability, nucleus disintegrates after 2 half lives. A. 1 B. 1/2 C. 1.5 D. 3/4 ...

what is velocity constant 'k' of a reaction????? ...

As we known , the number of unpaired valence electrons is the valency therebye, Boron (2s2 2p1) should have monovalency , but it is invariably trivalent , never monovalent why ? ...

If the tangent drawn at a point (t2,2t) on the parabola y2=4x is tha same as the normal drawn at a point(√5cosφ, 2sinφ) in the ellipse 4x2+5y2=20, find the values of t & φ. ...

let a,b,c and d be four distinct integers.....the find the smallest possible value of 4(a^{2}+b^{2}+c^{2}+d^{2})-(a+b+c+d)^{2} ...

1) ___ let P be any moving point on the circle x2+y2-2x=1 AB be the chord of contact of this point wrt the circle x2+y2-2x=0. find the locus of the circumcenter of the traingle CAB(C being the centre of circles) P.S - give an ...

For the first time i have seen an image which explains the formula 360/theta so nicely.. have a look.. *Image* ...

if sinθ = ksin(θ+φ) prove that tan(θ+φ)= sinφ/cosφ - k ...

Q1 \int_{0}^{[x]/3}{\frac{8^x}{2^{[3x]}}}dx where [.] is gint Q2 k ε N and I_k=\int_{-2k\pi}^{2k\pi}{\left|\sin x \right|}[\sin x]dx find \sum_{k=1}^{100}I_k Q3 I=\int_{sin^{-1}\alpha}^{cos^{-1}\alpha}{\frac {sinx}{sinx+cosx ...

Pb(IO3)2 a sparingly soluble salt in water has a Ksp= 2.6*10-13 . To 35 mL of a 0.15 M Pb(NO3)2 solution, 15 mL of a 0.8 M KIO3 is added and a ppt. is obtained. Find the concentrations of Pb2+ and IO32- left in the solution. ...