The brightest main-sequence star in a cluster has a temperature of 10,000 K and a luminosity about 100 times greater than the sun. What is the approximate age of the cluster?
A) About 1011 years B) About 107 years
C) About 109 years D) This cannot be answered using the HR diagram.
C
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Through a bizarre (and scientifically unexplainable) fluctuation in the spacetime continuum, a copy of a book titled Iguoonos: How We Evolved appears on your desk
As you begin to read, you learn that the book describes the evolution of the people living in the star system described above. In the first chapter, you learn that these people evolved from organisms that lived 5 billion years ago. Which of the following statements should you expect to find as you continue to read this book? A) As a result of traumatic experiences of their evolutionary ancestors, they dislike television. B) Their immediate ancestors were chimpanzees. C) They found that the presence of two stars in their system was critical to their evolution. D) They evolved on a different planet in a different star system and moved to their current location. E) They evolved from primitive wormlike creatures that had 13 legs, 4 eyes, and bald heads, thus explaining why such critters are now considered a spectacular delicacy.
The slope of a velocity vs. time graph is the __________
Fill in the blank(s) with correct word
Lillian sees a chair at the Exploratorium that has been scaled up by three. In attempting to lift it, she finds the chair is
A) three times as heavy. B) six times as heavy. C) nine times as heavy. D) more than nine times as heavy.
A television advertisement claiming that a product is light-years ahead of its time does not make sense because
A) it doesn't specify the number of light-years. B) it uses "light-years" to talk about time, but a light-year is a unit of distance. C) a light-year is an astronomically large unit, so a product could not possibly be so advanced. D) light-years can only be used to talk about light.