Which of the following objects is considered to possibly contain a black hole?
a. The central star of the Crab nebula
b. The Orion nebula.
c. LMC X-3
d. Algol
e. PSR 1257+12
C
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In the context of measuring the properties of galaxies, a__________is an object of known brightness that astronomers use to find distance
A) black hole B) white dwarf C) standard candle D) red giant
Transformers: If the secondary coil of a transformer contains more loops than the primary coil, then it is a
A. step-up transformer. B. step-down transformer.
A segment of wire of total length 3.0 m carries a 15-A current and is formed into a semicircle. Determine the magnitude of the magnetic field at the center of the circle along which the wire is placed
a. 1.6 ?T b. 4.9 ?T c. 1.0 ?T d. 9.8 ?T e. 15 ?T
An 10.0-W resistor is dissipating 100 watts. What are the current through it and the difference of potential across it?
a. 31.6 A, 3.16 V c. 3.16 A, 31.6 V b. 10.0 A, 3.16 V d. 3.16 A, 10.0 V