A galaxy that has created a large number of young stars all at once is a(n) _______________ galaxy
Fill in the blank(s) with correct word
starburst
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Briefly discuss dark matter
What will be an ideal response?
In Ptolemy's view of the universe, a planet moves on an epicycle whose center moves around the Earth on the deferent circle
a. Correct b. FALSE; Ptolemy put the Sun at the center. c. FALSE; The planet stays on the deferent circle. d. FALSE; Earth is at the center of the epicycle. e. FALSE; Both c and d are correct.
Which of the following is one important reason why most large astronomical telescopes are reflecting telescopes rather than refracting telescopes?
A) Reflecting telescopes have their heaviest component (the mirror) at the bottom rather than the top of the telescope's tube. B) Reflecting telescopes take up less space than refracting telescopes. C) Reflecting telescopes are taller than refracting telescopes. D) For a mirror and lens of the same diameter, a mirror will collect more light.
A child pulls on a wagon with a horizontal force of 75 N. If the wagon moves horizontally a total of 42 m in 3.0 min, what is the average power generated by the child?
A) 18 W B) 22 W C) 24 W D) 27 W