Current evidence suggests the universe will continue to expand forever, but some people would prefer if we lived in a recollapsing universe that would eventually stop expanding and start contracting. Based on current understanding, which of the following would have to be true for our universe to fit a recollapsing model?
A) Dark energy does not exist and there is much more matter than current evidence suggests.
B) Dark energy is the dominant form of energy in the cosmos.
C) The density of dark matter turns out to be greater than the density of dark energy.
D) The total density of matter equals the critical density.
A) Dark energy does not exist and there is much more matter than current evidence suggests.
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The exclusion principle applies to what kind of particles?
A) all fermions, but not bosons B) all bosons, but not fermions C) only leptons, but not other fermions D) both fermions and bosons E) only exchange bosons
Neutron stars have
A) very strong bi-polar magnetic fields. B) weak or non-existent magnetic fields. C) periods of days or weeks. D) monopolar fields that switch polarity every rotation. E) no relation to pulsars.
The heat transfer process in which heat flows directly through the material is
A. conduction B. convection C. radiation
Suppose you stand on a weighing scale and all of a sudden the atmosphere vanishes. The reading on the scale would
A) increase. B) decrease. C) remain the same.