A binary system has two stars of mass M circling their common center of mass on opposite sides of a circle of radius R. What is the potential energy of the system?

What will be an ideal response?


-GM2/R

Physics & Space Science

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If a 10°C piece of iron is heated until it has twice as much internal energy, its temperature will be

A) 20°C. B) 273°C. C) 293°C. D) 566°C. E) none of the above

Physics & Space Science

Venus may have started with an ocean's worth of water. If so, where is its water now?

A) The original water remains vaporized in the atmosphere due to Venus's intense heat. B) Most of the water is frozen beneath the surface. C) Most of the water combined with rocks in chemical reactions. D) The water was lost when ultraviolet light broke apart water molecules and the hydrogen escaped to space. E) The water changed to carbon dioxide through chemical reactions.

Physics & Space Science

Which of the following is true about low-mass stars compared to high-mass stars?

A) Low-mass stars are cooler and less luminous than high-mass stars. B) Low-mass stars are hotter and more luminous than high-mass stars. C) Low-mass stars are cooler but more luminous than high-mass stars. D) Low-mass stars are hotter but less luminous than high-mass stars. E) Low-mass stars have the same temperature and luminosity as high-mass stars.

Physics & Space Science

Mars, Jupiter, Saturn, and Venus are the Jovian planets.

a. true b. false

Physics & Space Science