What keeps water frozen on Mars?
a. The constant subzero surface temperatures
b. The low atmospheric pressure of the planet
c. The distance between Mars and the Sun
d. The relatively quick rotation period
e. The negligible axis tilt of the planet
b
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A cooling tower, shown schematically, has outside surface temperature of 70ºC when quiescent air is 10ºC. If the nominal diameter of the tower is 20 m, estimate a) the vertical distance up from the base where turbulent flow begins and b) total heat transfer due to natural convection.
What will be an ideal response?
An observer on a planet sees a spaceship approaching at 0.5c. A beam of light projected by the ship would be measured by this observer to travel at:
A) 0.25c. B) 0.5c. C) c. D) 1.5c. E) 2.5c.
How do we know that a hot main sequence star (and not some other kind of star) is embedded in a cloud of interstellar gas?
What will be an ideal response?
A 30.00 kg box slides up a 12.00 meters long incline at an angle of 30.00 degrees above the horizontal. Friction is negligible. The change in gravitational potential energy is
A. 2110 J. B. 1467 J. C. 1080 J. D. 1764 J. E. 760.0 J.