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
A
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An evening or morning star is a planet
a. True b. False Indicate whether the statement is true or false
What is the approximate diameter of the roundish region with a temperature of 300—500 K?
This frame from Figure 16.12 is from a supercomputer model of the formation of one of the first stars in the universe. Color indicates gas temperature: Blue and green represent cool gas (100—300 K), orange and red represent warm gas (500—3000 K), and yellow represents gas at intermediate temperatures (300—500 K). Use the information in the figure to answer the following questions.
The reason neutrinos are so penetrating is that
A) they are very heavy. B) they feel only strong nuclear force, and gravity. C) they are very light. D) they feel only the weak nuclear force, and gravity. E) they move so fast.
An ideal transformer is used to either increase or decrease the voltage in an AC circuit. When the output voltage is greater than the input voltage of a transformer then
A. the power output is smaller than the power input. B. the power output depends on the ratio of turns in the primary and secondary. C. the power output is the same as the power input. D. the power output is larger than the power input.