A Type I supernova is believed to occur when
a. the core of a massive star collapses.
b. hydrogen detonation occurs.
c. a white dwarf exceeds the Chandrasekhar limit.
d. the cores of massive stars collapse.
e. neutrinos in a massive star become degenerate and form a shock wave that explodes the star.
C
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This is a "thought" question. Why are few galaxies outside our own galaxy seen by our eyes in the circle around the sky where the Milky Way is located? This is because
a. there aren't any galaxies in those directions. b. dust in the Milky Way blots out our view of galaxies in those directions. c. the missing mass is in those directions. d. a massive explosion has blown galaxies away from those directions.
A transverse periodic wave is represented by the equation y(x, t) = -1.50 cm sin(1,500 rad/s t - 10.0
x). Another transverse wave is represented by the equation y(x, t) = +1.50 cm sin(1,500 rad/s t + 10.0
x). What is the equation that represents the superposition of the two waves?
A. y(x, t) = 3.0 cm sin(1,500 rad/s t - 10.0
x)
B. y(x, t) = 3.0 cm sin(1,500 rad/s t) cos(10.0x)
C. y(x, t) = +3.0 cm cos(1,500 rad/s t) sin(10.0x)
D. y(x, t) = 3.0 cm sin(1,500 rad/s t + 10.0x)
A spherical shell of inner diameter R and outer diameter 3R has a uniform density ?. What is the magnitude of the gravitational acceleration a distance 2R from the center of the spherical shell?
A) 15?G?R/7 B) 32?G?R/5 C) 25?G?R/12 D) 7?G?R/6 E) 7?G?R/3
The isotope 14C cannot be used in dating old samples of which of the following?
a. a bronze implement from a cave b. charcoal from a fire c. a bone buried in mud d. All of these choices can be dated using 14C.