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)

Physics & Space Science

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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?

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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

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In general, which of the following is usually the strongest bond?

A) van der Waals bond B) ionic bond C) hydrogen bond

Physics & Space Science