Why is the inner core solid even though it is hotter than the outer liquid core?
A. The dynamo effect causes ions in Earth's interior to become solid.
B. The great pressure at Earth's center forces the atoms in the core together, causing it to solidify.
C. Radioactivity causes liquid materials to become solid.
D. This is not unusual: hotter things tend to be more solid.
Answer: B
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A newly discovered planet has twice the mass and three times the radius of the earth. What is the free-fall acceleration g at the surface of the earth?
a. 2/9 g b. 2/3 g c. 3/4 g d. 4/3 g
Each of the following is a prediction of the theory of relativity. Which one is crucial to understanding how the Sun provides light and heat to Earth?
A) If you observe someone moving by you, you'll see their time running slowly. B) Gravity is curvature of spacetime. C) E = mc2 D) Time runs slower on the surface of the Sun than on Earth. E) Space is different for different observers. Time is different for different observers. Spacetime is the same for everyone.
White dwarfs lie on the lower left portion of the H-R diagram
Indicate whether the statement is true or false
The source of an atom's electronegativity is the
A) repulsive force occurring among electrons within the same shell. B) repulsive force occurring between electrons within neighboring shells. C) positively charged atomic nucleus. D) kinetic energy electrons have orbiting the nucleus.