What is the source of the magnetic field in the Crab Nebula? What is at the very center?
A.) A black hole.
B.) A neutron star.
C.) A white dwarf.
D.) Nothing. The star blew itself up.
E.) An excited Nebula.
Answer: B.) A neutron star.
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By what primary heat transfer mechanism does one end of an iron bar become hot when the other end is placed in a flame?
A) natural convection B) conduction C) radiation D) forced convection E) countercurrent.
For a system in mechanical equilibrium, the resultant
A) force must be zero. B) torque must be zero. C) both of these D) none of these
The Summer Triangle is formed by the stars Deneb, Vega, and Altair
Indicate whether the statement is true or false
The moderate temperatures of islands throughout the world has mainly to do with water's
A) poor conductivity. B) vast supply of thermal energy. C) high specific heat capacity. D) high evaporation rate. E) absorption of solar energy.