The white dwarf that remains when our Sun dies will be mostly made of ________
A) hydrogen B) neutrons C) helium D) carbon
D
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What causes the outward gas pressure that balances the inward pull of gravity in a main sequence star?
a. The rapid outward flow of gas. b. The rapid inward flow of the gas. c. The high temperature of the gas. d. The high density of the gas. e. c and d
Radioactivity Basics: The isotope 
U is radioactive and decays in a series to 
Th. In this series, the particles ejected from the nucleus are
A. one alpha particle and three beta-minus particles. B. three alpha particles and one beta-minus particle. C. one alpha particle and four beta-minus particles. D. four alpha particle and one beta-minus particle. E. two alpha particles and two beta-minus particles.
On sunny days, why do hot-air balloons suddenly rise when they drift over a wide road or a black asphalt parking lot?
What will be an ideal response?
Two identical balls are at rest side by side at the bottom of a hill. Some time after ball A is kicked up the hill, ball B is given a kick up the hill. Ball A is headed downhill when it passes ball B headed up the hill. At the instant when ball A passes ball B,
a. it has the same position and velocity as ball B. b. it has the same position and acceleration as ball B. c. it has the same velocity and acceleration as ball B. d. it has the same displacement and velocity as ball B. e. it has the same position, displacement and velocity as ball B.