The minimum size that makes it possible for a planetary surface to remain habitable over long time periods is a size that allows
A) plate tectonics to be present
B) a magnetic field to be present
C) an atmosphere to be present
D) hot spot volcanism to be present
A
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The internal energy of an ideal gas depends on
A) its pressure. B) its volume. C) its temperature. D) its temperature and pressure. E) its temperature, pressure, and volume.
Transistors are most useful devices electronic devices because
A. they are highly inductive. B. they are excellent signal amplifiers. C. they are excellent insulators. D. they are excellent conductors.
An object is placed 6.0 cm in front of a convex mirror with a radius of curvature of 16.0 cm. Which of the following statements describes the image?
A) The image is upright and 3.4 cm in front of the mirror. B) The image is inverted and 3.4 cm behind the mirror. C) The image is upright and 3.4 cm behind the mirror. D) The image is inverted and 3.4 cm in front of the mirror. E) none of the above
During takeoff a jet aircraft goes from 0 m/s to 60 m/s in 5 seconds. (a) What is the jet's acceleration? (b) What is the jet's speed after 22 seconds?