A star can remain in the giant-star stage for about 90 percent of its total lifetime before it dies
Indicate whether the statement is true or false
False
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What happened to the quarks that existed freely during the particle era?
A) They combined to make protons, neutrons, and their antiparticles. B) They froze out of the soup of particles at the end of the era. C) They evaporated. D) They combined to make electrons and neutrinos. E) They combined to make W and Z bosons.
One type of early protocell (pre-cells) probably consisted of small droplets of
A) water B) clay C) concentrated amino acids D) nucleic acids
Both pendulum A and B are 3.0 m long. The period of A is T. Pendulum A is twice as heavy as pendulum B. What is the period of B?
A) 0.71T B) T C) 1.4T D) 2T E) 3T
The gravitational interaction was the first force figured out by scientist Sir Isaac Newton. However,
A. it is not a fundamental force of nature, only a symptom of inertia. B. gravitation has been the hardest force to unite with electroweak and strong nuclear interactions. C. until we can detect gravitational waves, it will remain a mystery. D. it will never be incorporated into a "theory of everything" because it is an attractive force.