The Sun rotates with its equator inclined _____ to Earth's orbit
A) 7.2°
B) 14°
C) 21.4°
D) 28°
A
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What eventually halts the gravitational collapse of an interstellar gas cloud that forms a brown dwarf rather than a true (main-sequence) star?
A) The central object becoming hot enough to sustain nuclear fusion in its core B) Degeneracy pressure caused by the high density of electrons in the core C) Thermal pressure from the high core temperature D) The onset of convection in the object's outer layers
An object is moving with constant non-zero acceleration in the +x direction. The position versus time graph of this object is
A) a horizontal straight line. B) a vertical straight line. C) a straight line making an angle with the time axis. D) a parabolic curve.
According to the first law of thermodynamics, the sum of the heat gained by a system and the work done on that same system is equivalent to which of the following?
a. entropy change c. temperature change b. internal energy change d. specific heat
During each cycle of operation a refrigerator absorbs 45 cal from the freezer compartment and expels 85 cal to the room. If one cycle occurs every 8.0 s, how many minutes will it take to freeze 500 g of water, initially at 0°C? (Lv = 80 cal/g)
a. 800 min c. 120 min b. 4400 min d. 150 min