A spaceship is moving away from an observer at relativistic speed. Its length at rest is 100 m, but the observer measures its length as 60 m. A time interval of 84 s on the spaceship would be measured by the observer to be which of the following?
a. 50.4 s
b. 30.2 s
c. 134 s
d. 140 s
e. 84 s
d
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A 3 solar mass main sequence star is at the same distance as a 0.4 solar mass main sequence star. Which star appears brighter?
A. depends on the phase of the Moon B. the 0.4 solar mass main sequence star C. stars are approximately the same brightness D. the 3 solar mass main sequence star E. cannot tell with the information given
A temperature of degrees 5 Fahrenheit is equivalent to _____ Kelvin
a. 258.2 b. 278.0 c. –15.0 d. –268.0
How fast must a meter stick move, relative to the frame of the observer making the measurement, so its length will be measured to be 0.60 m?
A) 0.40c B) 0.90c C) 0.70c D) 0.80c E) 0.60c
The symbol indicating the atomic number of a nucleus is __________
Fill in the blank(s) with correct word