The celestial equator always crosses the horizon at the east point and west point
a. True
b. False
Indicate whether the statement is true or false
True
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Spherical aberration can occur in
A) mirrors and lenses. B) mirrors but not lenses. C) lenses but not mirrors.
An inertial force can be felt by observers
A. in a vacuum. B. at rest in any medium. C. moving much more slowly than the speed of light. D. whose reference frame moves in a circle.
A comet’s plasma tail always points directly away from the Sun because __________.
a. of pressure exerted by the fast-moving charged particles in the solar wind b. centrifugal forces throw the tail outward as the comet travels around the Sun c. the comet’s nucleus overheats on the Sun-facing side, forcing energetic jets of gas to shoot out from the dark side d. the tail is left behind as the comet moves through its orbit
A 35-g block of ice at -14°C is dropped into a calorimeter (of negligible heat capacity) containing 400 g of water at 0°C
When the system reaches equilibrium, how much ice is left in the calorimeter? The specific heat of ice is 2090 J/kg ? K, that of water is 4186 J/kg ? K, and the latent heat of fusion of water is 33.5 × 104 J/kg. A) 32 g B) 33 g C) 35 g D) 38 g E) 41 g