Exploration of this part of the atmosphere was conducted in the nineteenth century with hot-air balloons
a. Stratosphere
b. Troposphere
c. Mesosphere
d. Thermosphere
b
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Consider a closed pipe of length L. What are the wavelengths of the three lowest tones produced by this pipe?
A) 16L, 4L, L B) 4L, 2L, L C) 2L, L, L/2 D) 2L, L, 2L/3 E) 4L, 4L/3, 4L/5
The object in a ray diagram is perpendicular to the principal axis but does not have one end lying on the principal axis. The minimum number of rays that must be drawn in this ray diagram in order to determine the position of the image is
a. 1. b. 2. c. 3. d. 4. e. 5.
If ? = 24 V, at what rate is thermal energy generated in the 20-? resistor?
a.
13 W
b.
3.2 W
c.
23 W
d.
39 W
At what distance from a long straight wire carrying a current of 5.0 A is the magnitude of the magnetic field due to the wire equal to the strength of the Earth's magnetic field of about 5.0 × 10-5 T?
A) 1.0 cm B) 2.0 cm C) 3.0 cm D) 4.0 cm E) 5.0 cm