In an extrasolar planetary system containing a single planet, the parent star is measured to move about its center of mass every 24 years. Given this, what is the orbital period of the planet?
A) 48 years
B) 12 years
C) 24 years
D) this cannot be determined from this observation
C
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Most of the mass of a galaxy is contained in the
a. massive O and B stars in the galaxy. b. H I regions of the galaxy. c. H II regions of the galaxy. d. dark matter of the galaxy. e. disk of the galaxy.
The rigid object shown is rotated about an axis perpendicular to the paper and through point P. The total kinetic energy of the object as it rotates is equal to 1.4 J. If M = 1.3 kg and L = 0.50 m, what is the angular velocity of the object? Neglect the mass of the connecting rods and treat the masses as particles
a.
1.3 rad/s
b.
1.5 rad/s
c.
1.7 rad/s
d.
1.2 rad/s
e.
2.1 rad/s
Consider a situation where two moving objects collide and rebound from each other.Kinetic energy is definitely conserved
a. True b. False Indicate whether the statement is true or false
How do we think the first generation of stars would have been different from stars born today?
A) They would have lacked elements heavier than hydrogen and helium. B) They would have generated energy through fission rather than fusion. C) They would have all been very low in mass. D) They would have shined only with ultraviolet light, not visible light.