What are the three possible types of universe and what features distinguish them?
What will be an ideal response?
Open universe will expand forever, without enough mass to halt expansion.
Closed universe will stop expanding and collapse back on itself due to mass in excess of the critical density.
Critical universe has exactly enough mass to halt expansion after an infinite amount of time, but not collapse. A flat or Euclidean geometry is found here.
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Brown dwarfs are
A. objects massive enough to fuse deuterium but not massive enough to sustain hydrogen fusion. B. large terrestrial planets. C. very low-mass main sequence stars. D. what is left over after a massive star ejects most of its material through a supernova.
A 200-volt battery is connected to a 0.50-microfarad parallel-plate, air-filled capacitor. Now the battery is disconnected, with care taken not to discharge the plates. Some Pyrex glass is then inserted between the plates, completely filling up the space. What is the final potential difference between the plates? (The dielectric constant for Pyrex is k = 5.6.)
What is the frequency of the light emitted by atomic hydrogen with m = 8 and n = 12? (The Rydberg constant is R = 1.097 × 107 m-1, c = 3.00 × 108 m/s.)
A) 2.86 × 1013 Hz B) 1.43 × 1013 Hz C) 7.46 × 1013 Hz D) 8.82 × 1013 Hz E) 1.05 × 1013 Hz
In 1972, a utility owned a nuclear plant that was online 70% of the year, the oil burning plant was only out for unscheduled maintenance 10% of the time, and the gas-fired turbines were online 15% of the time
The nuclear plant is rated at 1000 MW, the oil plant at 940 MW, and the turbine at 200 MW. a. What is the total cost of running these three plants for the utility? b. How much would the utility have to charge per kWh to make a profit?