Why does the star's core get hotter as the core shrinks?
A. The core spins faster and friction heats it.
B. The core is compressed and compression heats a gas.
C. The fusing elements settle there to liberate their heat.
D. The statement is false. A shrinking core cools.
E. None of these choices is correct.
Answer: B
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Two masses are being pulled up a 30.0 degrees incline by a force F parallel to the incline. The acceleration down the incline is 1.00 
and the velocity is up the incline. The force is applied to a 200 kg mass and a string connects the 200 kg mass to a 150 kg mass. The coefficient of kinetic friction is 0.200. The tension in the string is
A. 840 N. B. 980 N. C. 1,140 N. D. 1,530 N. E. 2,660 N.
What are the different colored horizontal layers that we see in this photo of a wall in the Grand Canyon?
A) They are sediments deposited at different times in the past, so that layers near the bottom are the oldest and layers near the top are the youngest. B) They are different types of volcanic rock that cooled at different rates after a single, large volcanic eruption. C) They formed as the Colorado River carved out the canyon, so that the layers near the top are the oldest and the layers at the bottom are the youngest. D) They got their coloration from ancient civilizations that painted the rock.
The ground observer shown here sees the cans explode at the same time, yet the observer in the van sees the can on the right explode first. Suppose instead that the cans were side-by-side, one on the driver's side of the van and the other on the passenger's side. If the ground observer again saw the cans explode at the same time, what would the observer in the van see?
a. The can on the driver's side of the van explodes first. b. The can on the passenger's side explodes first. c. The cans explode at the same time.
In which of the following types of galaxies would you expect to find active star formation?
a. elliptical galaxies only b. elliptical and spiral galaxies c. spiral galaxies only d. elliptical and irregular galaxies e. spiral and irregular galaxies