`1U=... Kg`

Calculate and compare the energy released by a) fusion of 1.0 kg of hydrogen deep within Sun and b) the fission of 1.0 kg of ""^(235)U in a fission reactor.

The key feature of Bohr's spectrum of hydrogen atom is the quantization of angular momentum when an electron is revolving around a proton. We will extend this to a general rotational motion to find quantized rotational energy of a diatomic molecule assuming it to be rigid.The rule to be applied is Bohr's quantization condition. In a CO molecule, the distance between C (mass = 12 a. m. u ) and O (mass = 16 a.m.u) where 1 a.m.u = (5)/(3) xx 10^(-27) kg , is close to

A solution containing 0.11kg of barium nitrate in 0.1kg of water boils at 100.46^(@)C . Calculate the degree of ionization of the salt. K_(b) (water) = 0.52 K kg mol^(-1) .

Three blocks are connected as shown in fig. on a horizontal frictionless table if m_(1)=1 kg, m_(2)=8kg, m_(3)=27kg and T_(3)=36N, T_(2) will be:-

The weight of an object whose mas is 1 Kg is

In the figure shown if friction coefficient of block 1kg and 2kg with inclined plane is mu_(1)=0.5 and mu_(2)=0.4 respectively, then

Two masses m_(1) and m_(2) . Which are connected with a light string, are placed over a frictionless pulley. This set up is placed over a weighting machine, as shown. Three combination of masses m_(1) and m_(2) are used, in first case m_(1)=6 kg and m_(2)=2kg in second case m_(1)=5kg and m_(2)=3kg and in third case m_(1)=4kg and m_(2)=4kg .Masses are held stationary initiallly and then released. If the readings of the weighing machine after the release in three cases are W_(1) , W_(2) and W_(3) respectively then :-

Let vec(u),vec(v) and vec(w) be such that |vec(u)|=1,|vec(v)|=2,|vec(w)|=3 . If the projection vec(v) along vec(u) is equal to that of vec(w) along vec(u) and vec(v),vec(w) are perpendicular to each orher, then |vec(u)-vec(v)+vec(w)| equals ............... .