A boy on board a cruise ship drops a 30.0 gm marble into the ocean. If the resistive force proportionality constant is 0.500 kg/s, what is the terminal speed of the marble in m/s?
a. 0.147
b. 0.294
c. 0.588
d. 1.18
e. 2.35
C
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A car starts from rest and travels a distance of 100 m in 20 seconds with a constant acceleration. The velocity of the car is at the end of the 20 second interval is
A. 25 m/s. B. 20 m/s. C. 15 m/s. D. 10 m/s. E. 5.0 m/s.
Boat 1 goes directly across a stream a distance L and back taking a time t1 . Boat 2 goes down stream a distance L and back taking a time t2 . If both boats had the same speed relative to the water, which of the following statements is true?
a. t2 > t1 b. t2 < t1 c. t2 = t1 d. t2 = 2t1 e. t2 = 0.5t1
A change in pressure at any point in a confined fluid at rest is transmitted
A) undiminished to all points in the fluid. B) to points of lower pressure. C) in the direction of lower energies. D) all of the above E) none of the above
A friend tells you that he knows of a situation in which bowl of ice sitting by itself on a table in a room whose air temperature is 20oC gives up heat the surrounding air. What’s wrong with this concept?
A. It would violate the 0th law of thermodynamics B. It would violate the 1st law of thermodynamics C. It would violate the 2nd law of thermodynamics D. It would violate the 3rd law of thermodynamics