Applications to Astronomy: Black holes
A. are gaps in space, containing no matter.
B. are predicted by Einstein's special theory of relativity.
C. are the collapsed remnant of giant stars.
D. cannot be detected in binary star systems.
E. are a violation of Einstein's general theory of relativity.
Answer: C
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Series/Parallel Circuits: Four resistors having resistances of 20 ?, 40 ?, 60 ?, and 80 ? are connected in series across an ideal 50-V dc source. What is the current through each resistor?
A. 0.25 A B. 0.50 A C. 0.75 A D. 2.0 A E. 4.0 A
An electric device delivers a current of 5.0 A to a device. How many electrons flow through this device in 10 s? (e = 1.60 × 10-19 C)
A) 0.20 B) 20 C) 2.0 D) 3.1 × 1020 E) 31 × 1020
Assuming you are sitting still as you take this quiz, how would you draw your own worldline on a spacetime diagram?
A) a straight, vertical line B) You would not have a worldline because you are not moving. C) a straight, horizontal line D) a diagonal line
Would you expect the wire temperature to be greater or less for a number 18 copper wire as compared to a number 14 copper wire, both conducting the same electrical current?
What will be an ideal response?