Which outcome does the big crunch scenario predict? A.
the matter in the universe will slow the expansion to the point where it would finally come to a halt and then start to retract
B.
the universe will keep expanding and growing ever larger and galaxies will grow farther apart
C.
the universe will finally extinguish itself with a violent expansion similar to the one with which it began
D.
the gravity in the universe will grow very weak, resulting in the planets drifting into stars

Steam is generated in a boiler of a cogeneration plant at 10 mpa and 450°c at a steady rate of 5 kg/s. in normal operation, steam expands in a turbine to a pressure of 0.5 mpa and is then routed to the process heater, where it supplies the process heat. steam leaves the process heater as a saturated liquid and is pumped to the boiler pressure. in this mode, no steam passes through a condenser, which operates at 20 kpa. (a) determine the power produced in the turbine and the rate at which process heat is supplied in this mode. (b) determine the power produced in the turbine and the rate of process heat supplied if only 60 percent of the steam is routed to the process heater and the remainder is expanded to the condenser pressure. (3.32 mw; 9.69 mw; 4.25 mw; 5.82 mw)

If we relied solely on the nonrenewable resources found in the u.s., which one would we run out of first at current usage levels? a. natural gas b. oil c. uranium d. coal

The ozone hole appears in antarctica during