At age 21, you set out for a star that is 50 light-years from Earth. How fast would your spaceship have to travel in order to reach that star when you are 61 years old? One light-year is the distance light travels in one year
A) 0.58c
B) 0.68c
C) 0.78c
D) 0.88c
E) 0.96c
C
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A weightless astronaut in an orbiting satellite is
A) shielded from Earth's gravitational field. B) beyond the pull of gravity. C) like the satellite, pulled by Earth's gravitation. D) none of the above
For all reversible processes involving a system and its environment:
A. the entropy of the system does not change B. the entropy of the system increases C. the total entropy of the system and its environment does not change D. the total entropy of the system and its environment increases E. none of the above
Pluto is no longer classified as a planet
Indicate whether the statement is true or false
Explain the relationship between the general circulation of the air and the circulation of ocean currents
What will be an ideal response?