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

Physics & Space Science

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The horizon problem relates to the isotropy of the microwave background radiation

Indicate whether the statement is true or false

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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°

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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

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Which of the following statements is NOT correct about Bose-Einstein condensation?

a.The only fermions allowed in a Bose-Einstein condensation must come in pairs. b. Liquid 4He transitions to a superfluid as a Bose-Einstein condensate at a much higher temperature than liquid 3He transitions to a superfluid. c. A Bose-Einstein condensate has special properties because all of its constituent bosons are in the same quantum state. d. The wave functions of bosons in a Bose-Einstein condensate are forbidden to overlap due to the Pauli exclusion principle.

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