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Home Q & A Board Science-Related Homework Help Physics Astronomy
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EmpressDina EmpressDina
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6 years ago
When the Sun runs out of nuclear fuel and expands to become a red giant,
 
  A) the Earth's oceans will freeze solid
  B) the Earth will be ejected from the solar system
  C) the Earth will be destroyed
  D) the Earth will experience a runaway greenhouse effect followed by the total loss of its atmosphere

Question 2

The electric field at the surface of a conductor is
 
  A) always zero.
  B) perpendicular to the surface.
  C) parallel to the surface.
  D) never zero.

Question 3

Capacitance of capacitors depends upon
 
  A) the material between the conductors.
  B) the geometry of the conductors.
  C) the space between the conductors.
  D) all of these answers.
  E) none of these answers.

Question 4

Oxygen molecules are 16 times more massive than hydrogen molecules. At a given temperature, the average molecular kinetic energy of oxygen, compared to hydrogen,
 
  A) is greater.
  B) is less.
  C) is the same.
  D) cannot be determined since pressure and volume are not given.

Question 5

Thermal efficiency (non-Carnot) is
 
  A) Q/T.
  B) Q/m.
  C) 1  Qcold/Qhot.
  D) Q - W.
  E) 1 - Tcold/Thot.
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EEEEEricaEEEEErica
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6 years ago
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