A grand unified theory (GUT) refers to a type of theory intended to unify
A) the strong force with the electromagnetic and weak forces.
B) gravity with the strong and weak forces.
C) the electromagnetic and weak forces.
D) all four forces together.
A) the strong force with the electromagnetic and weak forces.
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The text states that luminous matter in the Milky Way seems to be much like the tip of an iceberg. This refers to the idea that
A) luminous matter emits white light, much like the light reflected from icebergs. B) black holes are much more interesting than ordinary stars that give off light. C) dark matter represents much more mass and extends much further from the galactic center than the visible stars of the Milky Way. D) the luminous matter of the Milky Way is essentially floating on the surface of a great sea of dark matter.
Galaxy A is 300 Mpc from Galaxy B. Hubble's Law says that V=H0 x D. About how fast is Galaxy A receding from the perspective of Galaxy B? Use a value of 75 km/s/Mpc for Hubble's constant.
A) 75 km/s B) 15000 km/s C) 30000 km/s D) 225 km/s E) 22500 km/s
All the ordinary matter, both luminous and nonluminous, makes up less than 5% of the Universe.
Answer the following statement true (T) or false (F)
A tiny gun made of a strong but very light material fires a bullet more massive than the gun itself. For such a weapon
A) the target would be safer than the shooter. B) recoil problems would be lessened. C) conservation of energy would not hold. D) conservation of momentum would not hold. E) both conservation of energy and momentum would not hold.