Aristotle was a great Greek philosopher with many amazing ideas. Which of these statements about him is not true? a.Many of his claims about physics and astronomy were wrong. b.He was the first person to recognize that dolphins should be considered as land mammals. c.He was a student of the Greek philosopher Plato. d.He was a tutor to 'Alexander the Great'. e.He believed that the circle was a perfect object and therefore concluded that the earth traveled a perfect circular orbit.

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The Hertzsprung-Russell diagram contains a region called the main sequence. Stars on this sequence have specific characteristics not found in other stars. What are these characteristics?

a.Stars on the Hertzsprung-Russell diagram main sequence have roughly the same age.
b.Stars on the main sequence of the Hertzsprung-Russell diagram are all roughly the same radius.
c.Stars on the main sequence of the Hertzsprung-Russell diagram have an orderly arrangement of stellar masses, decreasing in mass from lower right to upper left.
d.Stars on the main sequence of a Hertzsprung-Russell diagram do not produce heavy elements like iron.
e.Stars on the main sequence of a Hertzsprung-Russell diagram all generate energy from nuclear fusion.
f.None of the mentioned choices.
Aristotle was a great Greek philosopher with many amazing ideas. Which of these statements about him is not true?
a.Many of his claims about physics and astronomy were wrong.
b.He was the first person to recognize that dolphins should be considered as land mammals.
c.He was a student of the Greek philosopher Plato.
d.He was a tutor to 'Alexander the Great'.
e.He believed that the circle was a perfect object and therefore concluded that the earth traveled a perfect circular orbit.
Which of these is true about an M6 type star?
a.It will be a red star but slightly hotter than an M7 star
b.It will be a red star but slightly cooler than an M7 star
c.It will be a blue star but slightly hotter than an M7 star
d.it will be a blue star but slightly cooler than an M7 star.
e.It will be dwarf star in the temperature range of about 3000k.
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