The critical temperature the core must reach for a star to shine by fusion is
A) 5,800 K.
B) 11,000 K.
C) 127,000 K.
D) 10 million K.
E) 100 million K.
D
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Potential of Point-Charges: A sphere with radius 2.0 mm carries a +2.0 ?C charge. What is the potential difference, VB - VA, between point B, which is 4.0 m from the center of the sphere, and point A, which is 6.0 m from the center of the sphere? (k = 1/4??0 = 9.0 × 109 N ? m2/C2)
A. 1500 V B. -1500 V C. 170 V D. -0.63 V
A spaceship, traveling at WARP 1/2 away from the Earth, launches a shuttle moving away from the ship at c/2 (c/2 seen from the ship)
Classically one expects to see the shuttle moving at c from the Earth, but relativistically what speed do we expect seen from the Earth? A) 0.9c B) 0.5c C) 0.8c D) 0.7c E) 0.6c
Oxygen, O, (number 8), sulfur, S, (number 16), and selenium, Se, (number 34) have such similar chemical properties because
A) their outermost shells contain the same number of electrons. B) because they are all located close to one another in the periodic table. C) they all have the same number of occupied shells. D) These elements can't have similar chemical properties because they are in different periods of the periodic table.
The radioactive isotope 7Be (atomic number 4 ) decays to the isotope 7Li (atomic number 3). What type of radioactive decay is this?
A) electron capture B) beta decay C) electron ionization D) alpha decay