What do we think condensed out of the solar nebula?
a. hydrogen and helium
b. hydrogen compounds
c. rocky material
d. metals
e. all except a
Answer: e. all except a
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For dilute concentrations of point defects, the scattering distance for free electrons is _________related to the concentration of point defects.
Fill in the blank(s) with the appropriate word(s).
The density of a neutron star is comparable to the density of an atomic nucleus
Indicate whether the statement is true or false
A solid sphere, spherical shell, solid cylinder and a cylindrical shell all have the same mass m and radius R. If they are all released from rest at the same elevation and roll without slipping, which reaches the bottom of an inclined plane first?
a. solid sphere b. spherical shell c. solid cylinder d. cylindrical shell e. all take the same time
What temperature is needed to fuse helium into carbon?
A) 5,800 K B) 100,000 K C) 15 million K D) 100 million K E) one billion K