The silicates are the largest mineral group because silicon and oxygen are
A) the hardest elements on Earth's surface.
B) the two most abundant elements in Earth's crust.
C) found in the common mineral quartz.
Answer: B
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The total mass of the pair of stars in spectroscopic binaries are difficult to estimate because
a. we can't measure the radial velocities of each star in the system. b. we can't see the shape or tilt of the orbit. c. we can't find the diameters of the stars. d. we can't determine the luminosities of the stars. e. the Doppler shift is not measurable.
Which constellation is this?
A) Andromeda, the Princess B) Pegasus, the Winged Horse C) Orion, the Hunter D) Cepheus, the King E) Draco, the Dragon
Explain why white clothing keeps us cool, whereas black clothing warms us. Which is the better reflector? Which is the better absorber?
What will be an ideal response?
A body oscillates with simple harmonic motion along the x axis. Its displacement varies with time according to the equation x = 5 sin (?t + ?/3). The phase (in rad) of the motion at t = 2 s is
a. 7?/3 b. ?/3 c. ? d. 5?/3 e. 2?