In a liquid metal fbr, no neutron moderation is desired and sodium is used as a coolant to minimize fission-nutron thermalization. how many scatters with sodium, on average, would it take for 2 mev neutron to reach an average thermal energy of 0.025 ev

A33.1 g copper object is launched from a 1.5 m 30° steel incline positioned on the floor by being pulled up a string attached to a 50.0 g mass suspended vertically over a pulley. the object is projected towards a glass table where it lands when it is at the point along its trajectory with the lowest speed. it comes to a halt when it clears the opposite edge of the table. it then falls and lands on 9 physics texts each 5 cm thick that are stacked on the floor on the opposite side of the table. assume that the table does not have a ledge and the rectangular object experiences 0.05 n of air resistance as it falls towards the books. how far and how long did the object travel and how fast does it hit the books. assume that at the moment the copper object leaves the incline, the massless string and ideal pulley break off

How many times did thomas edison mess up the light bulb

The law of the conservation of momentum says that the total momentum of any closed and isolated system cannot