A sound source departs from a stationary observer. The frequency heard by the observer is
A) higher than the source.
B) lower than the source.
C) the same as that of the source.
D) equal to zero.
E) impossible to predict.
B
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What is the inductance of a series RL circuit in which R = 1.0 K? if the current increases to one-third of its final value in 30 ?s?
a. 74 mH b. 99 mH c. 49 mH d. 62 mH e. none of the above
A racecar driver steps on the gas, and his racecar travels 20 meters in 2 seconds starting from rest. The acceleration of the racecar is __________
Fill in the blank(s) with correct word
A car traveling 85 km h slows down at a constant 0.50 m/s2 just by “letting up on the gas.” Calculate
(a) the distance the car coasts before it stops, (b) the time it takes to stop, (c) the distance it travels during the first and fifth seconds.
Hurricanes derive their energy from
a. latent heat. b. hot air. c. cold water. d. wind.