Twenty milliseconds is 0.020 s
Indicate whether the statement is true or false
T
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The speed of the solar wind is approximately 400 km/s and the distance from the Sun to Saturn is 9.5 AU (1 AU = 1.5 × 10^8 km). How long does it take a particle in the solar wind to reach Saturn?
a. about 4.1 hours b. about 4.1 days c. about 41 days d. about 4.1 years e. about 41 years
Rank these magnetic fields, from weakest to strongest
A) Venus, Mars, Mercury, Earth B) Mars, Mercury, Venus, Earth C) Earth, Venus, Mars, Mercury D) The Moon, Mercury, Mars, Venus E) Mars, Venus, Earth, Mercury
In the simplified Drake equation, the total number of life-bearing planets in our galaxy is given by
A) NHP B) flife C) NHP × flife D) NHP / flife
A "critical mass" is needed for a chain reaction because
A) if the mass is too small the temperature achieved during fission will be too low to sustain the reaction. B) if the mass is too large, the temperature will get too high and the entire mass will blow up without fissioning. C) if the mass is too large, the density will be too high to sustain a chain reaction. D) if the mass is too small, too many neutrons will leak out without causing fission. E) if the mass is too small, there will not be enough uranium to start the reaction.