Which of the following is not a hard magnetic material?
a. iron
b. cobalt
c. nickel
d. both b and c
a
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Power: For the graph shown in the figure, what physical quantity does the slope of the graph represent for a dc circuit?
A. 1/(resistance) B. resistance C. potential D. (potential)2 E. 1/(potential)
Kepler originally proposed that the planets were spaced apart by ____
a. five spheres b. five regular solids c. six tetrahedrons d. five epicycles e. six regular solids
An up quark (u) has a charge of +2/3 and a down quark (d) has a charge of ?1/3. Which of the following describes a neutron?
A) uuu B) uud C) udd D) ddd
Which of the following does not accurately describe what we observe toward the Galactic center?
A) at radio wavelengths, we see giant gas clouds threaded by powerful magnetic fields B) at infrared wavelengths, we see a massive stellar cluster C) at optical wavelengths, we see a cluster of old, red stars D) at X-rays, we see faint emission from an accretion disk around a black hole