Which of the following processes is approximately reversible?
a) lighting a match
b) pushing a block up a frictionless inclined plane
c) frying an egg
d) swimming across a pool
e) stretching a spring by a small amount
A. b only
B. e only
C. b, d and e
D. b and e
D. b and e
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A European sports car dealer claims that his product will accelerate at a constant rate from rest to a speed of 100 km/hr in 9.00 s. What distance will the sports car travel during the 9.00 s acceleration period? (Hint: First convert speed to m/s.)
a. 55.5 m c. 111 m b. 125 m d. 250 m
Based on its abundance in Earth's crust, most rocks contain a mineral composed of the elements oxygen and
A) carbon. B) silicon. C) iron. D) sulfur.
An object moves 20 m east in 30 s and then returns to its starting point taking an additional 50 s. If west is chosen as the positive direction, what is the sign associated with the average velocity of the object?
a. + c. 0 (no sign) b. - d. any of the above
The synodic period of the moon
a. is about 27.32 days long. b. is the period of time for the moon to orbit Earth once with respect to the stars. c. is the period of time between successive eclipses at a given location on Earth. d. is the period of time from when the moon rises until the moon rises again the next night. e. none of the above