From the mass-luminosity relation, a 2-solar-mass star on the main sequence would have a luminosity of approximately ____ solar luminosities
a. 2
b. 4
c. 11
d. 0.5
e. 0.25
c
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Which of the following characteristics describes silicate minerals?
-Silicate minerals contain only silicon. -Silicate minerals make up 8 percent of Earth's crust. -Silicate minerals contain calcite and dolomite. -Silicate minerals contain halite and gypsum. -Silicate minerals contain silicon and oxygen.
Which of these is not involved in the operation of lasers?
a. stimulated emission b. population inversion c. metastable state d. blackbody radiation
A 45.0-kg sample of ice is at 0.00° C. How much thermal energy is needed to melt it? For water LF = 334,000 J/kg and LV = 2.256 × 106 J/kg
A) 1.50 × 104 kJ B) 4.10 × 106 kJ C) 0.00 kJ D) 1.02 × 105 kJ
A rain cloud contains 2.66 × 10^7 kg of water vapor. How long would it take for a 2.0 kW pump to lift the same amount of water to an altitude of 2 000 m?