## How much uranium-235 would be consumed in a fission bomb with a 20-kt explosive yield?

1. How much uranium-235 would be consumed in a fission bomb with a 20-kt explosive yield?
2. A neutron collides elastically head-on with a stationary deuteron in a reactor moderated by heavy water. How much of its kinetic energy is transferred to the deuteron?
3. A buildup of fission products “poisons” a reactor, dropping the multiplication factor to 0.995. How long will it take the reactor power to decrease by half, given a generation time of 0.15 s?

### Compare your answer with the 3.6×10⁶ tons of coal needed to fuel a comparable coal-burning power plant

A laser-fusion fuel pellet has mass 5.0 mg and consists of equal parts (by mass) of deuterium and tritium. (a) If half the deuterons and an equal number of tritons….

### explore this indirect approach to particle detection by plotting the data in the table below.

1. Your roommate is writing a science-fiction novel set very far in the future, 70 Gy after the Big Bang. One of the characters is a cosmologist, and your roommate….

### A rotor-resistance starter for a three-phase wound-rotor induction motor

1. A rotor-resistance starter for a three-phase wound-rotor induction motor   (a) adds external resistance to the wound rotor via sliprings (b) is connected in series with the machine stator….