Six seconds after starting from rest, a freely-falling baseball has a speed of
A) 10 m/s.
B) 30 m/s.
C) 60 m/s.
D) 70 m/s.
Answer: C
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When we look at an object that is 1,000 light-years away we see it
A) as it was 1,000 years ago. B) as it was 1,000 light-years ago. C) as it is right now, but it appears 1,000 times dimmer. D) looking just the same as our ancestors would have seen it 1,000 years ago.
What is the most significant drawback of possibly sending humans to Mars?
A) the fact that there would be no possible source of water on the surface B) the high probability of contamination of the Martian surface by microbes associated with human beings C) the high probability of Martian microbes contamination of contaminating the crew D) the fact that astronauts could not breathe in the Martian atmosphere
The 105°W longitude meridian is the center of the ______________ Standard Time zone in the United States
a. Pacific b. Mountain c. Eastern d. Central
A small source radiates an electromagnetic wave with a single frequency into vacuum, equally in all directions. As the wave moves, the amplitude of its electric field:
1.increases. 2.decreases. 3.stays constant.