In the afternoon, the decibel level of a busy freeway is 85 dB with 90 cars passing a given point every minute. Late at night, the traffic flow is only 8 cars per minute. What is the late-night decibel level?
a. 200 dB
b. 85 dB
c. 170 dB
d. 74 dB
e. 8.5 dB
d
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A 1.1 kg seagull takes off from a piling along the California coast and accelerates within 0.50 s to a flight speed of 7.5 m/s along a slightly inclined path. At the end of the 0.50 s period, it is 5.3 m above its point of takeoff. What power was developed by the bird’s wings?
A. 180 W B. 110 W C. 52 W D. 62 W
Each plate of an air-filled parallel-plate air capacitor has an area of 0.0040 m2, and the separation of the plates is 0.080 mm
An electric field of 5.3 × 106 V/m is present between the plates. What is the energy density between the plates? (?0 = 8.85 × 10-12 C2/N • m2) A) 124 J/m3 B) 84 J/m3 C) 170 J/m3 D) 210 J/m3 E) 250 J/m3
Igneous rock is formed from
A) crystallization of molten magma. B) high temperatures and pressures. C) solidified lava beneath the Earth's surface. D) any of these
Which terrestrial planet has the highest-pressure (thickest) atmosphere?
a. Mercury b. Venus c. Earth d. Mars