If you jounce up and down on a bathroom scale, what varies on the scale reading is
A) mg.
B) the normal force.
C) both of these
D) neither of these
Answer: B
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The post-Newtonian revolution began in 1900 when
A) Max Planck introduced the quantum of energy. B) Einstein introduced the general theory of relativity. C) Einstein introduced the special theory of relativity. D) Werner Heisenberg had one beer too many and declared that he was uncertain about his own identity. E) Michelson declared that the Newtonian age had ended.
A(n) _____ is a model universe with Earth at the center, such as the Ptolemaic Universe
A) heliocentric universe B) eccentric universe C) geocentric universe D) concentric universe
Consider a child who is swinging. As she reaches the lowest point in her swing:
a. the tension in the rope is equal to her weight. b. the tension in the rope is equal to her mass times her acceleration. c. her acceleration is downward at 9.8 m/s2. d. none of the above.
A person in a boat sees a fish in the water (n = 1.33), the light rays making an angle of 40° relative to the water's surface. What is the true angle (in degrees) relative to the water's surface of the same rays when beneath the surface?
a. 40 b. 35 c. 50 d. 55 e. 61