In the afternoon, the decibel level of a busy freeway is 89 dB with 90 cars passing a given point every minute. Late at night, the traffic flow is only 5 cars per minute. What is the late-night decibel level?
a. 205 dB
b. 9 dB
c. 176 dB
d. 89 dB
e. 76 dB
Ans: e. 76 dB
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Using graphical techniques estimate the temperature distribution through the earth around the electrical power line shown in Figure 2-62. Then estimate the heat transfer per unit length between the line and the ground surface.
Which of these did Count Rumford demonstrate?
a. That heat was only generated by fire, light, and sunshine. b. That caloric, or heat fluid, is a gas. c. That heat is a substance found in fire that is available only in limited amounts in every object. d. That heat can be generated in any amount wanted and was therefore not a material substance. e. That heat is a form of energy.
A 1.0-m wire segment carrying a current of 0.55 A oriented parallel to a uniform magnetic field of 0.80 T experiences a force of what magnitude?
a. 0.44 N b. 0.22 N c. 0.70 N d. 0.35 N e. 0.00 N
At Titan, the weather is driven by phase changes of ________ gas into liquid or solid forms
Fill in the blank(s) with correct word