An athlete can perform a certain number of pushups. The same athlete scaled up in size can do
A) fewer pushups.
B) the same number of pushups.
C) more pushups.
Answer: A
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Standing Sound Waves: In a resonating pipe that is open at one end and closed at the other, there
A. are displacement nodes at each end. B. are displacement antinodes at each end. C. is a displacement node at the open end and a displacement antinode at the closed end. D. is a displacement node at the closed end and a displacement antinode at the open end.
painter of weight W climbs a ladder of weight W/3 and length L. At the position shown in the figure, the ladder begins to slip. Assume that there is a frictionless roller at A. What is the coefficient of static friction, ?s , at B?
(A) 0.19
(B) 0.33
(C) 0.68
(D) 0.24
By what amount does the sound intensity decrease when the distance to the source triples?
a. 9.0 dB c. 6.0 dB b. 9.5 dB d. 3.5 dB
Of the possible statements that parallel rays are brought to a focus by a 1) concave mirror, 2) convex mirror, 3) converging lens, 4) diverging lens, the correct answer is
a. 1 and 2. b. 3 and 4. c. 1 and 3. d. 2 and 3. e. 2 and 4.