What is the source of Jupiter's intense radio waves and magnetism?
A) charged particles trapped in Jupiter's solid iron core similar to Earth
B) liquid metallic hydrogen swirling in the rapidly spinning mantle
C) the ionized sulfur ejected into a torus around Jupiter by Io
D) the auroral displays in the polar regions, just like with the Earth
E) a liquid iron and nickel outer core, just like the Earth's magnetic field
B
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Angular Momentum: A uniform, solid, cylindrical flywheel of radius 1.4 m and mass 15 kg rotates at 2.7 rad/s. What is the magnitude of the flywheel's angular momentum?
A. 40 kg ? m2/s B. 20 kg ? m2/s C. 80 kg ? m2/s D. 60 kg ? m2/s
Herschel believed the Milky Way was a disk of stars, while Shapley found the extended halo more like a ball
Indicate whether the statement is true or false
According to present understanding, a nova is caused by ________
A) carbon fusion in the core of a white dwarf B) hydrogen fusion on the surface of a white dwarf C) a white dwarf that gains enough mass to exceed the 1.4-solar-mass limit D) hydrogen fusion on the surface of a neutron star
A piece of iron sinks to the bottom of a lake where the pressure is 21 times what it is at the surface of the lake. Which statement best describes what happens to the volume of that piece of iron?
A) Its volume increases slightly. B) Its volume decreases slightly. C) There has been no change in the volume of the iron. D) Its volume becomes 1/21 what it was at the surface. E) Its volume becomes 21 times greater than at the surface.