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A projectile has a range R and time of flight T. If the range is doubled (by increasing the speed of projection, without changing the angle of projection), the time of flight will become

Chemistry

The standard enthalpy of combustion at 25⁰ C of hydrogen, cyclohexene (C₆H₁₀) and cyclohexane (C₆H₁₂) are – 241, –3800 and –3920 kJmol^-1, respectively. Calculate the standard enthalpy of hydrogenation of cyclohexene.

Mathematics

A letter lock consists of three rings marked with 15 different letters. If N denotes the number of ways in which it is possible to make unsuccessful attempts to open the lock, then
(a) 482 | N
(b) N is product of 3 distinct prime numbers
(c) N is product of 4 distinct prime numbers
(d) none of the above

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