Acritical reactor fueled solely with u-235 produces 5100 neutrons per generation. a sudden insertion of cold coolant causes the very next generation to produce 5400 neutrons. what is the reactivity change observed? what is the above reactivity change in $? hint: you need to know the delayed neutron fraction of u-235.

Alightning strike consists of charge moving from a cloud to the ground . in one particular case, the electrons in a lightning strike are confined to travel within a radius of 1.5 m and to move at a speed of 5.0 x 10 m/s. if the density of electrons in the strike is 10'15 electrons/m what current is carried by the lightning ?

A6,600 kg train car moving at +2.0 m/s bumps into and locks together with one of mass 5,400kg moving at -3.0m/s. what is their final velocity? +0.50 m/s -1.0 m/s +2.5 m/s -0.25 m/s

Need in all of themmm only answer if you know plsssss