One star has a temperature of 10,000 K and another star has a temperature of 5,000 K. Compared to the cooler star, how much more energy per second will the hotter star radiate from each square meter of its surface?
a. 16 times
b. 2 times
c. 1 × 10^16 times
d. 625 times
e. 25 times
a
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What keeps the Sun's outer layers from continuing to fall inward in a gravitational collapse?
A) neutrinos produced by nuclear fusion drag gas outward B) the strong force between protons C) electromagnetic repulsion between protons D) outward pressure due to super-heated gas
So far, beyond the solar system, the extrasolar planets found have been mostly
A) terrestrials with very elongated, distant orbits like comets. B) terrestrials very close to their star, and transiting its disk. C) large jovians very close to their star. D) large jovians orbiting solar-type stars about where our jovians are found. E) brown dwarfs much more massive than Jupiter.
Does a high-speed bullet's path bend more than a light beam bends as it passes near Earth?
A) Yes, because the bullet is heavier than the light beam. B) Yes, because the light beam has a greater acceleration that the bullet. C) Yes, because the bullet moves slower than the light beam. D) No, because all falling objects accelerate at the same rate. E) No, because of Einstein's equivalence principle.
As a rock sinks deeper and deeper into water of constant density, what happens to the buoyant force exerted on it by water on it if it started above the surface of the water?
A) The buoyant force keeps increasing steadily. B) The buoyant force remains constant. C) The buoyant force first increases and then remains constant. D) The buoyant force steadily decreases.