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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Which terrestrial planet has the highest-pressure (thickest) atmosphere?
a. Mercury b. Venus c. Earth d. Mars
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