In which direction do hurricanes in the Southern Hemisphere rotate?
a. clockwise
b. counterclockwise
c. either direction
Ans: a. clockwise
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Dean teaches that the phenomenon of regelation is due to the
A) freezing point of water. B) melting point of ice. C) open-structured nature of ice crystals. D) high specific heat of water.
A metallic conductor has a resistivity of 35 × 10^?6 ??m. What is the resistance of a piece that is 20 m long and has a uniform cross-sectional area of 4.0 × 10^?6 m2?
a. 0.44 ? b. 180 ? c. 2.3 ? d. 7.0 ? e. 2 800 ?
Beats: A policeman in a stationary car measures the speed of approaching cars by means of an ultrasonic device that emits a sound with a frequency of 39.6 kHz. A car is approaching him at a speed of 35.0 m/s. The wave is reflected by the car and interferes with the emitted sound producing beats. What is the frequency of the beats when the speed of sound in air is 343 m/s?
A. 5000 Hz B. 4500 Hz C. 8490 Hz D. 9000 Hz E. 4250 Hz
The magnetic forces exerted on each other by two parallel wires with unequal currents flowing in opposite directions is
A. repulsive and unequal in magnitude. B. attractive and unequal in magnitude. C. repulsive and equal in magnitude. D. attractive and equal in magnitude.