The average star spends ____ of its lifetime on the main sequence
a. 1%
b. 2%
c. 10%
d. 20%
e. 90%
E
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Earth doesn't experience a solar eclipse every month because
a. of unpredictable weather patterns. b. the moon always keeps its same side toward the Earth. c. the moon's position is not aligned with the Earth's orbit. d. its sometimes nighttime when the eclipse occurs. e. sometimes the moon is too far away.
On its own, a tow truck has a maximum acceleration of 3.0 m/s2. What will be its maximum acceleration when the truck is using a light horizontal chain to tow a bus of twice its own mass?
A) 2.5 m/s2 B) 2.0 m/s2 C) 1.5 m/s2 D) 1.0 m/s2
If the magnetic field in an EM wave is in the x-direction and the electric field in the wave is in the y-direction, the wave is traveling in the
A) x-y plane. B) direction halfway between the x- and y-directions. C) z-direction. D) x-direction. E) negative z-direction.
Which of the following is NOT true about vector images?
A. They are saved in a web-ready format. B. They are resolution-independent. C. You can create vector images using illustration software. D. They are created by combining shapes, curves, and lines.