Three small objects are positioned as follows: the 2.0-kg object at (0.0 m, 0.0 m), the 2.0-kg object at (2.0 m, 0.0 m), and the 4.0-kg object at (2.0 m, 1.0 m). Determine the coordinates of the center of mass of this system
A) (0.50 m, 1.5 m)
B) (1.5 m, 0.50 m)
C) (2.5 m, 1.5 m)
D) (2.5 m, 0.50 m)
B
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A 2.00-kg block of ice at 0.00°C is dropped into a very large lake at 25.0°C and completely melts
For water, the heat of fusion is 3.35 × 105 J/kg, the heat of vaporization is 2.25 × 105 J/kg, and the specific heat is 4190 J/kg ? K. The net change in entropy of the system consisting of the ice and the lake due to this melting process is closest to A) 2.45 × 103 J/K. B) 2.24 × 103 J/K. C) 2.06 × 102 J/K. D) -2.45 × 103 J/K. E) -2.06 × 102 J/K.
Since Lice = 333 J/g, the change in entropy (in cal/K) when 1.00 kg of ice melts is
a. 144 b. 291 c. 312 d. 516 e. 80
The pressure in a liquid depends on liquid
A) density. B) depth. C) both of these D) none of the above
Why did the era of nuclei end when the universe was about 380,000 years old?
A) The nucleosynthesis era that produced the nuclei heavier than helium ended. B) Photons were finally able to escape the plasma of the early universe and were no longer available to produce hydrogen and helium nuclei. C) Atomic nuclei were finally able to escape the plasma of the early universe. D) The universe had expanded and cooled enough for stable, neutral atoms to form. E) All the free particles had combined to form the nuclei of atoms.