Which of the following statements accurately describe a general distinction between the terrestrial planets (Mercury, Venus, Earth, Mars) to the jovian planets (Jupiter, Saturn, Uranus, Neptune)?

a. The jovian planets are much more massive.
b. The terrestrial planets have a much greater average density.
c. The terrestrial planets are rocky, and the jovian planets are composed of hydrogen, helium and hydrogen compounds.
d. All of the above.


Answer: d. All of the above.

Physics & Space Science

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An opaque gray surface having reflectivity of 0.5 at 27ºC is exposed to irradiation of 1000 W/m^2. Air at 7ºC flows over the surface and the convective heat transfer coefficient is 15 W/m^2K. Determine the net heat transfer per unit area from the surface.

What will be an ideal response?

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The armature (or spinning portion) of a motor is accelerated uniformly from rest to a rotational velocity of 1500 rev/min in 10 seconds. The rotational acceleration of the motor is

A. 150 rad/s2. B. zero. C. 31.4 rad/s2. D. 15.7 rad/s2. E. 75 rad/s2.

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Two identical steel balls are released from rest from the same height and travel along tracks as shown and labeled below

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A far-sighted student has a near point of 1.0 m. Calculate the focal length (in cm) of the glasses needed so the near point will be normal (25 cm)

a. 72 b. 25 c. 33 d. 100 e. ?33

Physics & Space Science