The Cassini probe Huygens made a soft landing on Titan
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TRUE
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Two stars have the same spectral type. Star X is in luminosity class III, while Star Y is in luminosity class V. Therefore, Star X is larger in radius than Star Y
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A rod is 4.0 m long and has a square cross-section that is 1.5 cm on each side. An ohmmeter measures 0.040 ? across its ends. What is the resistivity of the material from which this rod is made?
A) 2.3 × 10-6 ? ? m B) 1.5 × 10-4 ? ? m C) 0.015 ? ? m D) 0.023 ? ? m
The 50-kg stuntman places a 50-kg uniform 6-meter plank on top of a skyscraper and stands on the tip of it that overhangs the building as shown. What is the approximate distance that the overhang can be extended without disaster?
1) 0.5 m 2) 1 m 3) 1.5 m If the 6-meter board has a mass of only 25 kilograms, then the maximum overhang distance would be about 5) 0.5 m. 6) 1 m. 7) 1.5 m. 8) 2 m.
A rad is
A) a dosage of 2.58 × 10-4 C/kg. B) 10-2 J/kg. C) the SI unit of radioactivity ( = 1 decay/s). D) the SI unit of absorbed dose = 1 J/kg = 100 rad. E) 3.70 × 1010 decays/s in radium.