Wall posters are usually sold curled up in cylindrical cardboard tubes. If the length of the tube is 84.5 cm, and the inside diameter of the tube is 2.40 cm,
what is the area of the poster expressed to the correct number of significant figures? (Assume the poster is just as long as the tube and does not overlap itself.)
A) 202.8 cm2
B) 637.1 cm2
C) 203 cm2
D) 319 cm2
E) 637 cm2
E
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A basketball player jumps to make a basket and remains in the air for a moment. A sportscaster then remarks that she has "defied gravity." Which of the following accurately describes the situation?
A) The player did stay in the air in spite of the Law of Gravitation, but a single counter-observation is not enough to warrant revisiting a theory that usually works. B) The player produced enough force with her legs to accelerate upward and remains above ground only until the acceleration of gravity brought her back down. C) The player can "defy gravity" because the Universal Law of Gravitation makes an exception for basketball players. D) The player has defied gravity, so scientists must go back into the lab to refine their theory.
Significant Figures: What is the result, expressed to the proper number of significant figures, of adding 23.4 to 91.237 and then subtracting 23.4?
A. 91.237 B. 91.2 C. 91.3 D. 91.0 E. 91
Each of the following lists two statements. Which two are the basic premises for the special theory of relativity?
A) 1. The laws of nature are the same for everyone. 2. The speed of light is the same for everyone. B) 1. Everything is relative. 2. You can never really tell who is moving. C) 1. You can't go faster than the speed of light. 2. Time is different for different people. D) 1. The laws of nature are the same for everyone. 2. Everything is relative. E) 1. The speed of light is the same for everyone. 2. You can't go faster than the speed of light.
A certain thermodynamic engine extracts 1.30 kJ of thermal energy from a hot temperature reservoir and discharges 0.70 kJ of energy to a cold temperature reservoir. What is the efficiency of this engine?
A) 46% B) 54% C) 86% D) 27% E) 13%