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.
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
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
In general, which of the following is usually the strongest bond?
A) van der Waals bond B) ionic bond C) hydrogen bond