Which of the following lists the ingredients of the solar nebula from highest to lowest percentage of mass of the nebula?
A) light gases (H, He), hydrogen compounds (H2O, CH4, NH3), metals, rocks
B) hydrogen compounds (H2O, CH4, NH3), rocks, metals, light gases (H, He)
C) light gases (H, He), hydrogen compounds (H2O, CH4, NH3), rocks, metals
D) hydrogen compounds (H2O, CH4, NH3), light gases (H, He), rocks, metals
E) hydrogen compounds (H2O, CH4, NH3), light gases (H, He), metals, rocks
C
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Which statement about gamma ray bursters is NOT correct?
A) Millisecond flickering implies they are tiny in size. B) In seconds, they radiate enormous amounts of energy. C) They seem to be coming from far beyond our own Milky Way. D) They are scaled up X-ray bursters, with more massive objects involved. E) The beams may be bipolar ejections from the hypernova formation of black holes.
Power: A 120-? laboratory resistor is rated at 0.25 W. How much current can safely flow through the resistor?
A. 30 A B. 2.1 mA C. 22 mA D. 46 mA
Coulomb's Law: Two electrons are 20.0 mm apart at closest approach. What is the magnitude of the maximum electric force that they exert on each other? (e = 1.60 × 10-19 C, k = 1/4??0 = 9.0 109 N ? m2/C2)
A. 5.8 × 10-25 N B. 2.3 × 1010 N C. 2.3 N D. 5.8 × 10-27 N
During which phase of the moon do you expect to observe a solar eclipse?
A. first quarter B. new moon C. full moon D. third quarter E. Solar eclipses can occur at any phase of the moon.