As material leaves an expanding star and begins to fall into a white dwarf close companion
a. an accretion disk will form around the white dwarf.
b. the material will cool off because it begins to move at high velocities.
c. the material will fall directly straight onto the surface of the white dwarf.
d. the white dwarf will produce a protostar.
e. the white dwarf's iron core will collapse.
a
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____ is the separation of material in a newly formed planet or asteroid according to density. This happens when the object becomes molten
a. Accretion b. Differentiation c. Condensation d. Outgassing e. Sublimation
Two equal charges repel one another with a force of 4.0 × 10-4 N when they are 10 cm apart. (Coulomb's constant is k=9.0 × 109 N.m2/C2.) If they are moved until the separation is 5 cm, the repulsive force will be
A. 4.0 × 10-4 N. B. 64 × 10-4 N. C. 0.25 × 10-4 N. D. 1.0 × 10-4 N. E. 16 × 10-4 N.
The terms velocity and speed have identical meanings in physics
a. True b. False Indicate whether the statement is true or false
Mars has two moons that are most similar in character to ________
A) particles in the rings of Saturn B) comets C) small asteroids D) Earth's Moon