## 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 wants to know what the cosmologist will measure for the Hubble constant. What’s your answer, assuming a steady expansion rate?
2. When physicists “discover” a new particle, it isn’t by finding the particle itself in their detectors. Rather, they look for events that might indicate the particle’s decay. For a given type of event, they plot the frequency of events (number per unit energy interval) versus energy. The particle shows up as a bump or deviation from an otherwise smooth background curve. You can explore this indirect approach to particle detection by plotting the data in the table below. These data are from the Large Hadron Collider and show events producing a pair of photons versus the energyof the pair. You should see a modest bump whose energy you can roughly determine. That bump is evidence for the Higgs boson.

### 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….

### 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….

### 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….