Every cause has an effect and every effect has a cause

a. True
b. False
Indicate whether the statement is true or false


True

Physics & Space Science

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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.

Physics & Space Science

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

Physics & Space Science

In what three ways does flowing water erode a stream channel?

What will be an ideal response?

Physics & Space Science

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

Physics & Space Science