Scientific thinking is ________
A) completely different from any other type of thinking
B) based on everyday ideas of observation and trial-and-error experiments
C) a difficult process that only a handful of people can do well
D) an ancient mode of thinking first invented in Egypt
B
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A freight car moves along a frictionless level railroad track at constant speed. The freight car is open on top. A large load of coal is suddenly dumped into the car. What happens to the speed of the freight car?
A) It increases. B) It remains the same. C) It decreases. D) It becomes zero. E) Cannot be determined from the information given.
The lowest tone to resonate in pipe of length L that is open at both ends is 200 Hz. Which one of the following frequencies will not resonate in the same pipe?
A) 200 Hz B) 400 Hz C) 600 Hz D) 800 Hz E) 900 Hz
On a day when the speed of sound in the upper air is 320 m/s, you fly coast to coast in the United States, a distance of about 4 850 km, in about one hour, if the Mach number for the speed of your airplane is about
a. 1. b. 2 c. 3 d. 4 e. 5.
A 400-hp engine can deliver, in SI units, an average power of _____. (1 hp = 746 W)
a. 200 W c. 149,000 W b. 74,600 W d. 298,000 W