The Permian extinction event was mostly likely caused by
A) widespread volcanic activity in Siberia
B) an asteroid impact
C) the onset of a snowball Earth phase
D) the reversal of the Earth's magnetic field
Question 2A 1.0-kg object is moving with a constant velocity 2.0 m/s toward the north. There are two forces acting on the object. One of the forces is 3.0 N north. What is the second force that acts on the object?
A) 1.0 N north.
B) 3.0 N north.
C) 3.0 N south.
D) 2.0 N north.
E) 0.
Question 3Orphan planets are
A) planets which have been flung out into interstellar space as a result of inward migration
B) moons of gas-giant planets which are in unstable orbits and escape becoming planets themselves
C) planets which have been gravitationally captured by other stars
D) bodies blasted from rocky planets by giant impacts becoming planets themselves
Question 4The minimum size that makes it possible for a planetary surface to remain habitable over long time periods is a size that allows
A) plate tectonics to be present
B) a magnetic field to be present
C) an atmosphere to be present
D) hot spot volcanism to be present
Question 5A 1 mF, a 2 mF, and a 3 mF capacitor are connected in series, the combination being connected across a 9 volt battery.
(a) Which capacitor has the greatest charge?
(b) Which capacitor has the greatest voltage?
Question 6Aluminum has a positive coefficient of thermal expansion. Consider a round hole that has been drilled in a large sheet of aluminum. As the temperature increases and the surrounding metal expands, the hole diameter will
A) increase.
B) decrease.
C) remain constant.
D) depends how much metal surrounds the hole
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