During a lightning strike you don't want to be inside a building framed with
A) steel.
B) iron.
C) aluminum.
D) wood.
Answer: D
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A cheetah can maintain its maximum speed of 100 km/hr for 35.0 seconds. What minimum distance must a gazelle running 80.0 km/hr be ahead of the cheetah to escape?
a. 194 m c. 70.0 m b. 167 m d. 125 m
The temperature variations of the cosmic microwave background observed by the Planck telescope agree well with our model predictions. This provides persuasive evidence in favor of what?
A) both the Big Bang and inflation B) only the Big Bang, but not inflation C) not the Big Bang, but inflation D) neither the Big Bang nor inflation
An annular eclipse of the Sun occurs when the Moon doesn't quite cover the Sun in the zone of totality. This means that the Moon is
A) closer than usual to Earth. B) farther than usual from Earth. C) none of these
A bullet and a proton have the same momentum. Which has the longer wavelength?
A) the bullet B) the proton C) both the same