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A stone is tied to a string of length l and whirled in a circular path.The speed of the stone at the lowest point is u.Find the magnitude of change in velocity when the string is horizontal? let velocity when string is horizo ...

If a=cos left( frac{2pi }{7} ight)+i,sin left( frac{2pi }{7} ight), then the quadratic equation whose roots are a = a + a2 + a4 and b = a3 + a5 + a6 is ...

Two straight lines 3x + 4y = 5 and 4x – 3y = 15 intersect at point A. Points B and C are chosen on these two lines such that AB = AC then the equation of the line BC passing through (1, 2) with negative slope is ...

An electric bulb is rated 220 V-100 W. The power consumed by it when operated on 110 V will be ...

(x2-x+1)4 - 6 x2(x2-x+1)2 +5x4= 0 of multiplicity (a)2 (b)3 (c)4 (d)6 ...

Can anyone please suggest how to prepare for KVPY Interview i.e. what topics to study, what type of questions to expect etc. ...

The hybridization of sulphur in sulphur dioxide is ...

A body is moved along a st line by a machine delivering a const. power the distance moved by the body in time is proportional to a)t^3/4 b)t^3/2 c)t^1/4 d)t^1/2 ...

Which acid forms Zwitter ions ...

Hello! I gave my NSEC 0n 24th Nov. I m getting around 170 out of 240. i mfrom WB. Do i have a chance of getting selected for INcho.....???? ...

CH3OH → CH3COOH The above reaction proceeds in presence of.. (a) K2Cr2O7 (b)CH2N2 (c)CO2/BF3 (d) None ...

The point on y-axis equidistant from the points (3, 2) and (–1, 3) is ...

The compound X drawn below is a very important compound .It prevents autoignition in internal combustion engines,and thus improves performance and engine life.The common name of the X is used to market and grade the petrol an ...

What is the missing number in this series? 8 2 14 6 11 ? 14 6 18 12 ...

The normal at the point (3, 4) on a circle cuts the circle at the point ( –1, –2). Then the equation of the circle is ...

If a circle, whose centre is (–1, 1) touches the straight line x + 2y + 12 = 0, then the coordinates of the point of contact are ...

Number of structural isomers of {C_4}{H_{10}}O are ...

If the lines 3x - 4y + 4 = 0 and 6x - 8y - 7 = 0 are tangents to a circle, then the radius of the circle is ...

Which of the following conditions is always true for congruent triangles? ...

left[ {frac{1}{4}} ight] + left[ {frac{1}{4} + frac{1}{{200}}} ight] + left[ {frac{1}{4} + frac{1}{{100}}} ight] + .....left[ {frac{1}{4} + frac{{199}}{{200}}} ight] is ...

Siderite is an ore of ______. ...

Vertices of a figure are (– 2, 2); (– 2, – 1); (3, –1); (3, 2), it is a ...

Find the radius of the circle inscribed in the square. *Image* ...

Which number is the odd one out? 9678 4572 5261 3527 7768 ...

Two particles execute SHM of same amplitude of 20 cm with same period along the same line about the same equilibrium position. The maximum distance between the two is 20 cm. Their phase difference in radians is ...

Two particles are in SHM in a straight line about same equilibrium position. Amplitude A and time period T of both the particles are equal. At time t=0, one particle is at displacement y1= +A and the other at y2= –A/2, and ...

Thirty men take 20 days to complete a job working 9 hours a day. How many hour a day should 40 men work to complete the job? ...

The type of energy possessed by a simple pendulum, when it is at the mean position is ...

If a hydrogen atom at rest, emits a photon of wavelength λ, the recoil speed of the atom of mass m is given by: ...

A parallel sided block of glass of refractive index 1.5 which is 36 mm thick rests on the floor of a tank which is filled with water (refractive index = 4/3). The difference between apparent depth of floor at A & B when seen ...