If I short out a D cell and draw a current of 7 A for 5 s, how many coulombs of charge move through the circuit?
a. 7 C c. 7/5 C
b. 5 C d. 35 C
D
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When a star collapses to become a black hole, its mass
A) increases. B) decreases. C) remains unchanged.
A loop of radius r = 3.0 cm is placed parallel to the xy-plane in a uniform magnetic field = 0.75 T . The resistance of the loop is 18 ?
Starting at t = 0, the magnitude of the field decreases uniformly to zero in 0.15 seconds. What is the magnitude of the electric current produced in the loop during that time? A) 0.79 mA B) 3.9 mA C) 1.7 mA D) 2.1 mA E) 0.20 mA
What is the primary basis on which we divide the ingredients of the solar nebula into the four categories hydrogen/helium, hydrogen compounds, rock, and metal?
A) the temperatures at which various materials can condense from gaseous form to solid form B) the atomic mass numbers of various materials C) the locations of various materials in the solar nebula D) the amounts of energy required to ionize various materials
Degeneracy pressure stops the crush of gravity in all the following except
A) a very massive main-sequence star. B) a white dwarf. C) a neutron star. D) a brown dwarf. E) the central core of the Sun after hydrogen fusion ceases but before helium fusion begins.