For small angle approximations
a. the angle must be 10° or less
b. the angle must be 10 radians or less
c. the angle must be 1° or less
d. the angle must be 1 radian or less
e. the angle must be 45° or less
a
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Suppose we discover a "super-Earth" at a distance of 10AU from its star. Should we consider it to be potentially habitable?
A) Yes, its atmosphere may contain substantial amounts of greenhouse-type gases that can keep the planet warm beyond the usual boundaries assumed for habitable zones. B) Yes, because its host star must be much bigger in order to have a super-Earth, so it will be much hotter there. C) No, only planets at approximately 1AU will ever be potentially habitable. D) No, greenhouse gases "freeze-out" at those distances.
What must be the diameter of a cylindrical 120-m long metal wire if its resistance is to be 6.0 ?? The resistivity of this metal is 1.68 × 10-8 ? ? m
A) 0.065 mm B) 0.65 mm C) 0.65 cm D) 0.325 mm E) 0.0325 mm
For a gas at thermal equilibrium the average speed v, the most probable speed vp, and the root-mean-square speed vrms are in the order:
A. vp < vrms < v
B. vrms < vp < v
C. v
The unit of measure called the "newton" is:
a. the force needed to accelerate a 1-kilogram mass at 1 meter per second per second. b. the force needed to accelerate a 1-pound mass at 1 ft/s2. c. the acceleration resulting when a 1-kilogram mass moves 1 m/s2. d. the acceleration of a 1-pound mass moving at 1 m/s2. e. the force needed to accelerate a 1-kilogram mass to a speed of 1 m/s.