Coulomb's Law: Two 10¢ coins (dimes) carrying identical charges are lying 2.5 m apart on a table. If each of these coins experiences an electrostatic force of magnitude 2.0 N due to the other coin, how large is the charge on each coin? (k = 1/4??0 = 9.0 × 109 N ? m2/C2)
A. 2.6 ?C
B. 26 ?C
C. 6.7 ?C
D. 5.2 ?C
E. 52 ?C
Answer: E
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Double-Slit Interference: Two radio antennas are 130 m apart on a north-south line. The two antennas radiate in phase at a frequency of 3.6 MHz. All radio measurements are made far from the antennas. What is the smallest angle, reckoned east of north from midway between the antennas, at which constructive interference of two radio waves occurs? (c = 3.00 × 108 m/s)
A. 50° B. 55° C. 45° D. 40° E. 35°
Today, Mars has virtually no magnetic field
Indicate whether the statement is true or false
During the late Cenozoic, sea level was
A) low-water was tied up in the glaciers that covered the land surface. B) high as melt water from glaciers was released due to warm ocean floors. C) relatively high as ocean floors stood higher and seawater covered the continents. D) relatively low due to rifting activity in the final phase of Pangaea's break-up.
How many values of the magnetic quantum number, m?, correspond to a value of 4 for the orbital quantum number, ??
A) 3 B) 5 C) 8 D) 9 E) 7