People sometimes have difficulty distinguishing between scientific explanations of common events and other kinds of explanation (superstition, prejudice, magic, etc.). Which of the following best helps to identify a scientific explanation?
A. We can test the explanation by comparing its predictions to measurement results
B. The explanation relies on local folklore
C. The explanation goes against the results of public opinion polls
D. The explanation changes according to the social status of the observer
Answer: A
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a. 65 km/sec b. 75 km/sec c. 55 km/sec d. 85 km/sec e. 95 km/sec
Inelastic Collisions: A 2200-kg auto moving northward at 12.0 m/s runs into a 3800-kg truck which is also moving northward, but at 5.00 m/s. If the vehicles lock bumpers, how fast are they moving just after the collision?
Fill in the blank(s) with the appropriate word(s).
A football thrown with a spinning motion is more stable than one thrown without spin because
A. the angular momentum of a spinning object can only be changed by applying a torque. B. the torque generated by the spinning action is conserved. C. air flows more easily around spinning objects. D. there is no net torque on a spinning object.
Which of the following sound frequencies lie(s) outside the audible range?
a. 14 Hz b. 11 kHz c. 2700 Hz d. All of these