Of the five rock-forming mineral groups—the silicates, carbonates, oxides, sulfides, and sulfates—which two form economically important ores?
A) silicates and carbonates
B) carbonates and oxides
C) oxides and sulfides
D) sulfides and sulfates
Answer: C
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Center of Mass: Three small masses are positioned as follows: 2.0 kg at (0.0 m, 0.0 m), 2.0 kg at (2.0 m, 0.0 m), and 4.0 kg at (2.0 m, 1.0 m). Determine the coordinates of the center of mass (or center of gravity) of this system.
A. (0.50 m, 1.5 m) B. (1.5 m, 0.50 m) C. (2.5 m, 1.5 m) D. (2.5 m, 0.50 m)
The superposition of two waves
?
and
?
at the location x = 0 in space results in
A. beats at a beat frequency of 3 Hz. B. a pure tone at a frequency of 153 Hz. C. a pure tone at a frequency of 156 Hz. D. beats at a beat frequency of 6 Hz. E. beats at a frequency of 156 Hz.
Monochromatic light (? = 500 nm) is incident on a soap bubble (n = 1.4) that is 50 mm thick. What is the change of phase of the light reflected from the front surface?
A. 0 B. 180° C. ?/2 D. ?/2 E. 55°
Which of the following types of data provide evidence that helps us understand the life tracks of low-mass stars?
A) H-R diagrams of globular clusters B) H-R diagrams of open clusters C) spacecraft observations of the Sun D) observing a low-mass star over many years