Which of the following stars spends the longest time in the protostellar phase of life?
A) a 1 solar-mass star
B) a 2 solar-mass star
C) a 3 solar-mass star
D) a 4 solar-mass star
E) a 5 solar-mass star
A) a 1 solar-mass star
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An effective theory must
A) have been proven. B) must have been around for centuries or longer. C) be continuously tested. D) include mathematical formulae.
How is the age of the galaxy determined?
a. measuring the metallicity of Population II stars b. finding the turnoff point in the H-R diagram of globular clusters c. from the motion of stars in the galactic halo d. counting the number of open clusters in the spiral arms
In Problem 4.7, the force in truss member BG is:
(A) 20.83P (B) 0.83P (C) 1.24P (D) 2.08P
A 6.0-kg object moving 2.0 m/s in the positive x direction has a one-dimensional elastic collision with a 4.0-kg object moving 3.0 m/s in the opposite direction. What is the total kinetic energy of the two-mass system after the collision?
a. 30 J b. 62 J c. 20 J d. 44 J e. 24 J