A 20 solar mass star will stay on the main sequence for 10 million years, yet its iron core can exist for only a:
A) day.
B) week.
C) month.
D) year.
E) century.
A
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What is a compound?
A) a group of molecules B) a molecule containing hydrogen C) a molecule containing two or more elements D) an ionized molecule E) a molecule containing carbon
This chapter discusses the "critical density" of the universe. More generally, when we say that something is a "critical value" in science, we mean
A) a number that signifies some boundary or change. B) a value that has been heavily criticized. C) an idea, representing a value system, that is very important. D) any number that has been very precisely measured.
Consider the potential energy U(x) = (1.0 J/m3)x3 - (8 J/m2)x2 + (15 J/m)x + 8.0 J. Find the turning points of the bound motion when the energy E is 8.0 J
A) 1.0 m and 7.0 m B) 3.0 m and 4.0 m C) 2.0 m and 4.0 m D) 3.0 m and 5.0 m E) 1.44 m and 5.56 m
The image of radio emission uses different colors to represent different levels of intensity. Which color represents the brightest radio emission? Which color represents the lowest levels of brightness?
What will be an ideal response?