Connect a pair of lamps in series and current is drawn from the battery. Connect the same lamps in parallel and the current drawn is
A) less.
B) the same.
C) more.
D) sometimes more, sometimes less.
Answer: C
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Why are white dwarf supernovae more useful than massive star supernovae for measuring cosmic distances?
A) White dwarf supernovae all have roughly the same true peak luminosity, while massive supernovae come in a wide range of peak luminosities. B) We can see only white dwarf supernovae in distant galaxies, not massive star supernovae. C) White dwarf supernovae are much more common than massive star supernovae. D) White dwarf supernovae obey Leavitt's law, while massive supernovae do not.
If you had something the size of a sugar cube that was made of neutron star matter, it would weigh ________
A) about as much as a large mountain B) as much as the entire Earth C) about 50 pounds D) about as much as a truck
My electric razor operates on 120. v and requires 3.0 Amperes. How much current comes out after delivering 360. watts of power?
A) 40. A B) 0. A C) 3.0 A D) 1.2 A E) 2.4 A
What is the minimum energy needed to change the speed of a 1600-kg sport utility vehicle from 15.0 m/s to 40.0 m/s?
A) 1.10 MJ B) 10.0 kJ C) 20.0 kJ D) 40.0 kJ E) 0.960 MJ