A 10-kg object is dropped from rest. After falling a distance of 50 m, it has a speed of 26 m/s. What is the change in mechanical energy caused by the dissipative (air) resistive force on the object during this descent?
a. ?1.3 kJ
b. ?1.5 kJ
c. ?1.8 kJ
d. ?2.0 kJ
e. ?2.3 kJ
b
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A) 2 times B) 4 times C) 8 times D) 9 times E) 16 times
The surface of the inclined plane shown is frictionless. If F = 30 N, what is the magnitude of the force exerted on the 3.0-kg block by the 2.0-kg block?
A. 18 N B. 27 N C. 24 N D. 21 N E. 15 N
The very earliest Greek theory of the structure of the universe pictured Earth at the center with the planets revolving around it at an unchanging rate in simple circles. The Greeks later revised this theory because
A) they didn't believe the theory was sufficiently beautiful to represent the eternal gods. B) they observed that the planetary motions are irregular and include such things as retrograde motion. C) certain observations led them to the conclusion that Earth has a spherical shape. D) they came to believe that the sun should be at the center of things. E) Actually, the Greeks never did abandon this theory--the theory was not altered until the time of Copernicus.
The number of significant figures in 0.040 is
A) one. B) two. C) three. D) four.