The great contribution of Tycho Brahe was to
A) observe planetary positions with sufficient accuracy that later enabled Kepler to discover the laws of planetary motion.
B) discover four moons orbiting Jupiter, thereby lending strong support to the idea that the Earth is not the center of the universe.
C) offer the first detailed model of a Sun-centered solar system, thereby beginning the process of overturning the Earth-centered model of the Greeks.
D) discover that planets orbit the Sun in elliptical orbits with varying speed.
A
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Two uniform solid spheres have the same mass, but one has twice the radius of the other. The ratio of the larger sphere's moment of inertia to that of the smaller sphere is
A) 9/5. B) 8/5. C) 4/5. D) 4. E) 2.
A vertical spring has a mass hanging from it, which is displaced from the equilibrium position and begins to oscillate. At what point does the system have the least potential energy?
A) at the highest point B) at one-fourth of the distance between the highest point and lowest point C) at the lowest point D) at the point where the spring is unstretched E) at the equilibrium point
The most massive planet in our solar system is
A) Saturn. B) Uranus. C) Mars. D) Jupiter. E) Neptune.
From laboratory measurements, we know that a particular spectral line formed by hydrogen appears at a wavelength of 486.1 nanometers (nm). The spectrum of a particular star shows the same hydrogen line appearing at a wavelength of 485.9 nm
What can we conclude? A) The star is moving toward us. B) The star is moving away from us. C) The star is getting hotter. D) The star is getting colder. E) The "star" actually is a planet.