A star less massive than our Sun
A) will have a longer lifetime
B) will have a shorter lifetime
C) will have the same lifetime as the Sun
D) could have either a longer lifetime or a shorter lifetime depending on its chemical composition
A
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What primary wavelength and corresponding photon energy is emitted by a body at:
(a) 400.°C? (b) 800.°C? (c) 1200.°C?
It is often easier to keep a heavy object sliding than it is to start it sliding in the first place
Indicate whether the statement is true or false
What is the approximate density of the Sun's core?
A. 16 g/cm3 B. 160 g/cm3 C. 1.6 g/cm3 D. 1600 g/cm3
The site from which an airplane takes off is the origin. The x axis points east; the y axis points straight up. The position and velocity vectors of the plane at a later time are given by
?
m and 
m/s.
?
The plane is most likely
A. just touching down. B. in level flight in the air. C. ascending. D. descending. E. taking off.