An extraterrestrial observer would pick up the strongest radio signals when:
A) the Earth was at perihelion.
B) North America was either rising or setting for the observer.
C) North America was directly in front of the observers.
D) at new or full Moon.
E) Saturday Night Live is on.
B
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A wooden block contains some nails so that its average density is exactly equal to that of water. If it is placed in a tank of water and released from rest when it is completely submerged, it will
A) rise to the surface. B) sink to the bottom. C) remain where it is released.
What is a rem?
A) A rem is a unit for measuring radiation exposure. B) A rem is the maximum exposure limit for occupational safety. C) Rem stands for Rapid Electron Motion. D) A rem is the number of radiation particles absorbed per second. E) Rem is an '80s rock group.
Which is the latest stage of a star?
A) Helium collects within the core. B) Carbon collects within the core. C) The surface of the star expands into a red giant. D) The star contracts into a blue giant.
Where did the asteroid that is believed responsible for the extinction of the dinosaurs hit the surface of the Earth?
A) in Siberia in Russia B) in the desert in Arizona C) in the middle of the Pacific Ocean D) in the Yucatan peninsula in Mexico