Sunspots tend to occur in groups, or pairs, with the magnetic field around the pair resembling that around a bar magnet
a. True
b. False
Indicate whether the statement is true or false
True
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Why did Copernicus hesitate to consider alternatives to the Ptolemaic Universe? a. A heliocentric Universe contradicted Christian theology at the time
b. There was no way to prove uniform circular motion. c. New star formation showed no parallax. d. Most people already believed in a heliocentric Universe. e. His mathematics could not disprove Ptolemy's epicycles, deferents and equants.
Only two forces act on a 3.0-kg mass. One of the forces is 9.0 N east, and the other is 8.0 N in the direction of 62° north of west. What is the magnitude of the acceleration of the mass?
a. 2.0 m/s2 b. 2.4 m/s2 c. 3.3 m/s2 d. 2.9 m/s2 e. 5.7 m/s2
The Hope Diamond weighs 44.5 carats. There are 200 mg per carat. How many kilograms does the Hope Diamond weigh?
A) 0.000890 kg B) 0.00890 kg C) 0.0890 kg D) 0.890 kg E) 8.90 kg
A 0.200-m wire is moved parallel to a 0.500-T magnetic field at a speed of 1.50 m/s. What emf is induced across the ends of the wire?
a. 2.25 V b. 1.00 V c. 0.600 V d. zero