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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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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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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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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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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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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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in chemical bonding i cant get what is co-ordinate bond ...
