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A piece of metal of 2kg-wt is suspended from one end of a vertical wire whose end is fixed and the piece is fully immersed in an oil od density 0.7*1000 kg/m3 .The length of the wire increases by 1mm.If the diameter of the wi ...
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1)An astronaut jumps from an aeroplane.after he had fallen 40m,then his parachute opens.Now he falls with a retardation of 2m/s2 and the earth with a velocity of 3m/s.What was the height of the the aeroplane?For how long astr ...
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plz balance the following equations: 1)KMnO4 + FeSO4 + H2SO4->K2SO4 +MnSO4 + +Fe2(So4)3 + H2O [ by oxidation no. method ] 2) Cr2O7 + NO2- -> Cr3+ + NO3- [by half reaction method] ...
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1)There are 4 boys and 3 girls. What is the probability the boys and girls sit alternately? 2). Two trains are 2 kms apart. Speed of one train is 20m/s and the other train is running at 30 m/s .Lengths of the trains are 200 a ...
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Plz make me understand the meaning of surface energy. And another thing why spraying results in coldness??? Plz give me explanation. ...
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1)A lift is going upwards with an acceleration of 4.9 m/s2.Whatv will b the apparent wt. of a 60kg man in the lift?What when the lift rises up with a uniform velocity of 4.9m/s2?If the rope of the lift is broken,then? 2)A mac ...
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Find the sum of 2+5+10+17+26+.......to n terms. ...
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Prove that sin 10°.sin 30°.sin 50°.sin 70°=1/16 ...
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Plz help me 2 solve it: 1)A carrom board (4ft*4ft) has the queen at the centre.The queen ,hit by the striker moves to the front edge,rebounds & goes in the hole behind the striking line.Find the magnitude of displacement of t ...
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It is written in the book that typically uk(coefficient of kinetic friction)<us(coefficient of static friction).I didn't understand that reason and also why us<1 and uk<1(but not always) ? ...
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i)Prove that cos2A + cos2(A+ pie/3) + cos2(A- pie/3) = 3/2 ii)If sin4x/a + cos4x/b = 1/(a+b),Prove that sin12x/a5 + cos12x/b5 = 1/(a+b)5. iii)Prove that (1+cosA+sinA)/(1+cosA-sinA)=(1+sinA)/cosA. iv)If tanx=k,find sinx/cos3x ...
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I couldn't solve this.- Rain is falling vertically with a speed of 30m/s.A woman on a bicycle is travelling with a speed of 10m/s in the north to south direction.In what direction should she hold her umbrella in order to prot ...
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Plz make me understand the meaning of torsional vibrations. ...
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If tan(a-b)/tan a+sin2c/sin2a=1,show that tana.tanb=tan2c ...
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if 2 cosA=cosB+cos3A & 2 sinA=sinB-sin3B,show that sin(A-B)=±1/3 ...
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cos(a+b)=4/5 &cps(a-b)=5/13 & a,b lies in b/w 0o to 45o ,find the value of tan2a. ...
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1) Train A starts from X at 12:00 p.m & reach at Y on 2:30 p.m & train B starts from Y at 12:15 and reach at X on 2:15 so,when both trains crosses each other? 2) Two trains are travelling from point A to point B such that the ...
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1) Three wheels make 36, 24, 60 rev/min. Each has a black mark on it. It is aligned at the start of the qn.When does it align again for the first time? 14 20 22 5 sec 2) In a race from pt. X to pt Y and back, Jack averages 0 ...
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plz explain me how 2 give the bond line representation of compounds.Explain it with the help of examples. Also tell me the meaning of solid & dashed wedge formula. ...
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Plz make me understand the meaning of quantum nos. & also principal quantum no.,azimuthal q.no.,magnetic q. no.,spin q. no.Explain me in such a way so that i can understand bcoz my new classes of XI have just started . ...
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If sin4x/a + cos4x/b = 1/a+b ,prove that sin8x/a3 + cos8x/b3 = 1/(a+b)3 . ...
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If tan x= a/b , find the value of asin x- bcos x/asin x+bcos x . ...
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Plz solve this sum. If acos theta - bsin theta =c,prove that a sin theta + b cos theta= (a2+b2-c2) ...
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A circle is inscribed in a regular hexagon of side 2 3 cm.Find (i) circumference of the inscribed circle. (ii)area of the inscribed circle. ...
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*Image* In the given figure, a chord AB of a circle of 10cm radius subtends a rt. angle at the centre O.Find the area of the sector OABC & of the major segment.(pie=3.14) ...
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plz explain the exact meaning of pH value & for what purpose is it used? ...
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may i know when i would get assignments of physics as well as chemistry? ...
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how can we show that white light consists of 7 constituent colours? why the white light passing through a rect. block does not show dispersion? explain the reason why the white light shows the phenomenon of dispersion while p ...
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pls explain me co-ordinate bond. ...
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if the angle of elevation of a cloud from a point 'h'metres above a lake is a and angle of depression of its reflection in the is b.Prove that the height of cloud is h( tan b + tan a )/( tan b - tan a ) .pls solve it by drawi ...
