The most numerous life on Earth is
A) insects
B) plants
C) human beings
D) microbes
D
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A faint white dwarf that temporarily increases in brightness as a consequence of nuclear explosions on its surface is termed
a. a nova. b. a Type II supernova. c. a bright nebula. d. a red giant.
The acceleration due to gravity at the surface of Planet X is 10 m/s2 . What is the acceleration due to gravity at an altitude of 3 000 km above the surface of this planet?
a. 10 m/s2 b. 8.0 m/s2 c. 4.4 m/s2 d. More information is needed.
If two vectors are perpendicular to each other, their cross product must be zero
A) True B) False
A deep space probe moving forward in space needs to make a course correction and so fires a thruster on the side of the probe 90° away from its direction of motion, as shown below. This thruster, while on, exerts a constant force on the probe perpendicular to its original direction of motion. While the thruster is operating, which trajectory best describes the probe’s motion? (Hint: Note that the thrust force delivers an upward impulse to the probe during every successive time interval. Consider what happens to the ball in figure C2.4 as it receives analogous continual downward impulses.)
A. A
B. B
C. C
D. D
E. E