GPS stands for
a. the metric system of measurement
b. grams per second
c. Global Positioning System
d. a space shuttle
e. none of the above
C
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The three principal sources of internal heat of terrestrial planets are
A) conduction, differentiation, and accretion. B) accretion, differentiation, and radioactivity. C) accretion, differentiation, and eruption. D) convection, differentiation, and eruption. E) conduction, convection, and eruption.
Gravitational lensing occurs when
A) massive objects bend light beams that are passing nearby. B) massive objects cause more distant objects to appear much larger than they should and we can observe the distant objects with better resolution. C) dark matter builds up in a particular region of space, leading to a very dense region and an extremely high mass-to-light ratio. D) telescope lenses are distorted by gravity.
A child has a temperature of 101°F. If her total cross-sectional area is 2 m2, find the energy lost each second (in W) due to radiation, assuming the emissivity is 1. (Assume the room temperature is 70°F.)
A. 217 B. 180 C. 90 D. 68 E. 850
A wave travels in a string at 58 m/s. A second string of 10% greater linear density has the same tension applied as in the first string. What will be the resulting wave speed in the second string?
a. also 58 m/s b. 61 m/s c. 180 m/s d. 55 m/s e. 61 m/s