What is thought to prevent the formation of stars with masses larger than about 300 times that of our Sun?
A) Molecular clouds do not have enough material to form such massive stars.
B) Such massive stars would fragment into binary stars because of their rapid rotation.
C) Such massive stars would generate so much light that radiation pressure would blow them apart.
D) The onset of degeneracy pressure would prevent such massive stars from forming.
C) Such massive stars would generate so much light that radiation pressure would blow them apart.
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Hot gas created during the big bang should be detectable becausethe ____
a. gas has traveled with galaxies as they formed and is spread through the Universe of the present day b. big bang occurred everywhere at once, and should be visible in any direction at long look-back times c. big bang occurred in a certain location, and the radiation from the gas is concentrated there d. gas has travelled to the edges of the Universe and will be visible at negative redshifts e. radiation emitted by the gas has travelled at the same speed as the expanding Universe and is visible all around us
How do astronomers define the "superforce"?
A) a force connecting electromagnetism with the strong and the weak nuclear forces B) the GUT, with all five forces combined C) the GUT, but with no dark energy added in D) a force connecting gravity and the electroweak force E) a force including only dark energy and gravity
The oldest rocks found on the Earth's surface date back about ________ billion years
A) one B) two C) three D) four E) four and a half
A syringe has an inside radius of its barrel of 0.50 cm and at the opening at the end of the needle the radius is 1.0 mm. If a force F is applied to the plunger, what is the force produced at the opening of the needle?
a. 5F b. 25F c. F/5 d. F/25