A boat is traveling at 4.0 m/s as it passes the starting line of a race. If the boat accelerates at 1.0 
for 6.0 seconds, then the average velocity of the boat for the 6.0 seconds is
A. 21 m/s.
B. 9.0 m/s.
C. 13 m/s.
D. 10 m/s.
E. 7.0 m/s.
E. 7.0 m/s.
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A mountain climber lies flat on the surface of a glacier that is inclined at 30 degrees below the horizontal. He remains stationary because he is holding onto a rope attached to a spike embedded in the ice further up slope than he is. The rope is parallel to the surface of the ice. If the force of the ice upon his body is 210N, what is the tension in the rope?
A. 121N B. 105N C. 182N D. 364N E. 242N
A geyser such as Old Faithful in Yellowstone Park is similar to a
A) vacuum bottle. B) canteen. C) coffee percolator. D) teakettle. E) vat of molten lead.
If a car engine has a thermal efficiency of 50% and it does 500 J of work in one cycle, how much energy does it expel to the cold reservoir each cycle?
1.250 J. 2.500 J. 3.750 J. 4.1000 J.
By examining the following three images, what can you conclude?
a. Venus is covered with clouds. b. Earth has a large amount of liquid water. c. Some form of ice does exist on Mars, but it does not have large amounts of liquid water. d. The planets in order from the least to most dense atmospheres are Venus, Earth, and Mars. e. all of the above