Young's Modulus: A 50-kg bucket of concrete is suspended from a steel wire that is 1.0 mm in diameter 1.0 mm and 11.2 m long. What distance will the wire stretch? Young's modulus for steel is 2.0 × 1011 Pa.
Fill in the blank(s) with the appropriate word(s).
35 mm
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For main-sequence stars, 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.
The Pauli exclusion principle tells us that no two electrons in an atom can have the same quantum number(s)
A) n, ?, m?, and ms. B) n, ? and m?. C) m? and ms. D) n and ?. E) n.
The Roche limit is the point at which
A) the mass of an object classifies it as a moon. B) a moon orbiting a planet experiences synchronous rotation. C) the external tidal forces on an object are strong enough to be felt by the object. D) the external tidal forces on an object become greater than the internal forces that hold it together. E) the internal forces that hold an object together weaken so that the object falls apart.
Direct motion of a planet is its normal motion ____________ among the stars
a. west to east along the ecliptic b. east to west along the ecliptic c. west to east along the celestial equator d. east to west along the celestial equator