Every cause has an effect and every effect has a cause
a. True
b. False
Indicate whether the statement is true or false
True
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If an object's orbital velocity is greater than its escape velocity, then the shape of the path is a/an __________________ and the orbit is____________
a. ellipse, closed b. circle, closed c. parabola, open d. parabola, closed
The density of a neutron star is
a. about the same as that of a white dwarf. b. about the same as that of the Sun. c. about the same as an atomic nucleus. d. zero.
When does a protostar become a main-sequence star?
A) when the rate of hydrogen fusion becomes high enough to balance the rate at which the star radiates energy into space B) when a piece of a molecular cloud first begins to contract into a star C) when it becomes luminous enough to emit thermal radiation D) at the instant that the first hydrogen fusion reactions occur in the protostar's core
In what three ways does flowing water erode a stream channel?
What will be an ideal response?