Ocean trenches such as the Tonga and Marianas Trench, are
A) subduction zones where lithosphere is pulled down to the asthenosphere.
B) some of the steepest places on Earth.
C) found at continental-continental plate boundaries that mark the the deepest places on Earth.
Answer: A
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The compound Ni3Al is used to strengthen nickel based alloys used in high temperature gas turbine materials. The crystal structure of Ni3Al is a cube with Al atoms at the eight cube corners and Ni at all of the cube face centers.
(a) What is the Bravais lattice type for Ni3Al and (b) What are the atom positions?
Aberration: Chromatic aberration in lenses is due to the
A. reflection of light by the lens. B. refraction of light by the lens. C. dispersion of light by the lens. D. polarization of light by the lens. E. None of the other choices is correct.
Which of the following is not one of the four general themes or "story lines" that underlie this course?
A) energy B) practical "household" science that you can use around your home, your car, etc. C) how we know what we know in science D) comparisons and contrasts between Newtonian and contemporary physics E) the social context of physics
It takes no work to hold a cheerleader in the air, as shown here. If no work is done by the cheerleaders, why do they eventually tire?
a. Because maintaining the same position for a long time is boring. b. Their bodies expend chemical energy as their muscles function; this is "hard work," but not the same kind of work that moves a mass over a distance. c. The concept of work, as it apples in physics, does not apply to any process that involves people. d. The arrangement is unstable and they can easily fall over. e. The cheerleaders at the greater height have more potential energy.