What actually produces the energy in the Sun?
A: Matter and anti-matter annihilation in the corona of the Sun
B: A LOT of electricity occurring in the convection zone
C: Mass of reacting elements is larger than that of the products (some converted to energy in the core)
D: Gravitational collapse of the chromosphere
E: A combination of all of the above
Ans: C: Mass of reacting elements is larger than that of the products (some converted to energy in the core)
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the electromagnetic force on the proton 
A. The vector points in the +x direction. B. The vector points in the -x direction. C. The vector points in the +y direction. D. The vector points in the -y direction. E. The vector points in the +z direction. F. The vector points in the -z direction. T. The vector is zero.
Which of the following observations of an extrasolar planet system would be inconsistent with what we expect from the nebular theory of solar system formation?
A) a system which has two terrestrial planets close in and two jovian planets farther out B) a system in which some planets have small moons orbiting in a direction opposite to the planet's rotation C) a system in which some planets rotate in a direction opposite to their orbits D) a system in which all the planets orbit in completely different planes
A 900-kg car traveling east at 15.0 m/s collides with a 750-kg car traveling north at 20.0 m/s. The cars stick together. What is the speed of the wreckage just after the collision?
A) 6.10 m/s B) 12.2 m/s C) 25.0 m/s D) 35.0 m/s E) 17.3 m/s
In general, which of the following is usually the strongest bond?
A) van der Waals bond B) ionic bond C) hydrogen bond