The fission properties of the plutonium isotope 239pu are very similar to those of 235u. the average energy released per fission is 180 mev. during the cold war, the premier of the soviet union threatened the united states with 2.0 megaton 239pu warheads. (each would have yielded the equivalent of an explosion of 2.0 megatons of tnt, where 1 ton of tnt releases 4.2 x 109 j.) if the plutonium that fission has been 8.0% of the total mass of the plutonium in such a warhead, what was that total mass

Write short note on the following ; collision theory, rotation angle and angular velocity, centripetal acceleration, coriolis force, and newton's law of gravitation.

Consider an ordinary, helium-filled party balloon with a volume of 2.2 ft3. the lifting force on the balloon due to the outside air is the net resultant of the pressure distribution exerted on the exterior surface of the balloon. using this fact, we can derive archimedes’ principle, namely that the upward force on the balloon is equal to the weight of the air displaced by the balloon. assuming that the balloon is at sea level, where the air density is 0.002377 slug/ft3, calculate the maximum weight that can be lifted by the balloon. note: the molecular weight of air is 28.8 and that of helium is 4.

If the chemical properties of a substance remain unchanged and appearance or shape of a substance changes it is called a ?