Observations of young stars (as well as theory) tell us that when the Sun was young the solar wind
A) was weaker than it is today.
B) was stronger than it is today.
C) was about the same strength as it is today.
D) was nonexistent.
E) blew outward only along the Sun's poles.
B
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Which one of the words below is a name for a type of galaxy in the Hubble classification system?
a. red giant b. visual c. spiral d. 21-centimeter e. statuesque
A transverse wave is traveling on a string stretched along the horizontal x-axis. The equation for the vertical displacement y of the string is given by y = 0.0020 cos[?(15x - 52t)], where all quantities are in SI units
The maximum speed of a particle of the string is closest to A) 0.33 m/s. B) 0.43 m/s. C) 0.64 m/s. D) 0.53 m/s. E) 0.74 m/s.
Process of Science: If any single test of a scientific hypothesis contradicts it, the hypothesis must be revised
Indicate whether the statement is true or false
A friend from Europe asks what the length of a 100-yd football field would be in meters. After doing the conversion, what would you tell her?