At the time of the winter solstice (the start of winter) the sunlight is at a lower angle and thus is ____ than(as) in the start of summer in the northern hemisphere
a. less intense
b. more intense
c. the same intensity
a
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The critical temperature the core must reach for a star to shine by fusion is
A) 5,800 K. B) 11,000 K. C) 127,000 K. D) 10 million K. E) 100 million K.
An 80-g aluminum calorimeter contains 380 g of water at an equilibrium temperature of 20°C. A 120-g piece of metal, initially at 352°C, is added to the calorimeter. The final temperature at equilibrium is 32°C
Assume there is no external heat exchange. The specific heats of aluminum and water are 910 J/kg•K and 4190 J/kg•K, respectively. The specific heat of the metal is closest to A) 520 J/kg ? K. B) 480 J/kg ? K. C) 390 J/kg ? K. D) 350 J/kg ? K. E) 560 J/kg ? K.
The diameter of an atom is 1.4 × 10-10 m and the diameter of its nucleus is 1.0 × 10-14 m. What fraction of the atom's volume is occupied by its nucleus?
A) 7.1 × 10-5 B) 2.6 × 10-17 C) 5.1 × 10-9 D) 3.6 × 10-13
The laws of physics are the same in all inertial frames of reference
Indicate whether the statement is true or false