How is the lifetime of a star related to its mass?
A) More massive stars live slightly shorter lives than less massive stars.
B) More massive stars live much longer lives than less massive stars.
C) More massive stars live much shorter lives than less massive stars.
D) More massive stars live slightly longer lives than less massive stars.
C
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The horizon problem relates to the isotropy of the microwave background radiation
Indicate whether the statement is true or false
A hobbyist launches a projectile from ground level on a horizontal plain. It reaches a maximum height of 72.3 m and lands 111 m from the launch point, with no appreciable air resistance. What was the angle of launch if g = 9.80 m/s2?
A) 69.0° B) 67.4° C) 22.6° D) 44.8°
Ten kilograms of water at 0°C is mixed with 10 kg of water at 100°C. The change in entropy (in cal/K) of the system is
a. 1 000 b. 480 c. ?720 d. 240 e. ?168
Which of the following statements is NOT correct about Bose-Einstein condensation?