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Home Q & A Board Science-Related Homework Help Physics Astronomy
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anja@phs.ae anja@phs.ae
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6 years ago
What force(s) are responsible for the collapse of an interstellar cloud?
 
  a. nuclear
  b. gravity
  c. electric
  d. magnetic
  e. both c and d

Question 2

If the mass of the Earth decreased by a factor of two with no change in radius, your weight would
 
  a. increase by a factor of 4.
  b. increase by a factor of 2.
  c. stay the same.
  d. decrease by a factor of 2.
  e. decrease by a factor of 4.

Question 3

What must occur for an object to be considered a main sequence star?
 
  a. Hydrostatic equilibrium
  b. Nuclear fusion reaction in the core
  c. Protostar life begins
  d. Both a and b

Question 4

Which of the following planets can be seen as a crescent phase from Earth?
 
  a. Mercury
  b. Venus
  c. Mars
  d. Both a and b
  e. All of the above

Question 5

While on the main sequence a star's primary energy source comes from
 
  a. nuclear fusion.
  b. nuclear fission.
  c. gravitational potential energy.
  d. magnetic fields.
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rtstudentrtstudent
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6 years ago
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anja@phs.ae Author
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6 years ago
this is exactly what I needed
annakc
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Yesterday
Thanks
gmiannotti
wrote...

2 hours ago
Thanks
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