Which recording formats employ magnetism?
a. videotape b. CD
c. DVD d. floppy disk
a, d
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You run directly towards a plane mirror at 5 m/s. How fast do you approach your image?
A) 0 m/s B) 5 m/s C) 7 m/s D) 10 m/s E) 2 m/s
Which of the following are not relativistically invariant quantities?
a. the speed of light, c c. mass b. time d. energy
The molecular building blocks of life have been found
A) only on the Earth B) on the Earth, in interstellar clouds, and in meteorites C) on the Earth and in meteorites D) on the Earth and on Mars
Compared with the standard hour of 60 minutes used today, the hour of ancient Egypt
A) was longer than the hour used today. B) was shorter than the hour used today. C) differed in length depending on the pharaoh in power at the time. D) was longer than 60 minutes in the summer and shorter than 60 minutes in the winter. E) divided the entire day into 12 equal parts.