Why do some scientists say that the Moon may have been important for the evolution of human life?
A) It created the tides in the ocean, where life most likely started.
B) It stabilized Earth's axis tilt and prevented large climate changes.
C) Meteorites from the Moon were the seeds of life on Earth.
D) It gave humans the inspiration to explore worlds beyond Earth.
E) It most certainly wasn't—only lunatics would think so.
B
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Seismic waves are classified as body waves and surface waves. An example of a body wave is a
A) Primary wave (P-wave). B) Love wave. C) Rayleigh wave. D) Tertiary wave (T-wave).
Snell's Law: A beam of light in air enters a glass slab with an index of refraction of 1.40 at an angle of incidence of 30.0°. What is the angle of refraction?
A. 20.9° B. 47.5° C. 51.8° D. 30.0° E. 14.9°
Angular Momentum: A person sits on a freely spinning lab stool that has no friction in its axle. When this person extends her arms,
A. her moment of inertia decreases and her angular speed increases. B. her moment of inertia decreases and her angular speed decreases. C. her moment of inertia increases and her angular speed increases. D. her moment of inertia increases and her angular speed decreases. E. her moment of inertia increases and her angular speed remains the same.
If a convex lens were made out of very thin clear plastic filled with air, and were then placed underwater where n = 1.33 and where the lens would have an effective index of refraction n = 1, the lens would act in the same way
a. as a concave mirror in air. b. as a concave lens in air. c. as a convex lens in air. d. as a flat refracting surface between water and air as seen from the water side. e. as the glasses worn by a farsighted person.