A type II supernova
a. occurs when a white dwarf's mass exceeds the Chandrasekhar limit.
b. is the result of helium flash.
c. is characterized by a spectrum that shows hydrogen lines.
d. occurs when the iron core of a massive star collapses.
e. is characterized by a spectrum that shows hydrogen lines and occurs when the iron core of a massive star collapses.
e
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Electrons orbit the atomic nucleus in just the same way that planets orbit the Sun.
Answer the following statement true (T) or false (F)
A 7.0-kg bowling ball experiences a net force of 6.0 N. What will be its acceleration?
a. 0.86 m/s2 c. 7.0 m/s2 b. 6.0 m/s2 d. 42 m/s2
Globular clusters are too small to have black holes at their center
Indicate whether the statement is true or false
A 160 lb person has a mass of 160/32 = 5 slugs. A 160-lb person steps into an elevator and stands on a bathroom scale. Determine the scale reading for the given scenarios. After moving downwards at constant speed, the elevator is slowing down at 2 m/s2 as it is coming to rest
a. 150 lb b. 160 lb c. 170 lb d. none of the above