Observer A is 3.0 m from a tiny light bulb and observer B is 12.0 m from the same bulb. Assume that the light spreads out uniformly and undergoes no significant reflections or absorption
If observer B sees a light of intensity I, the light intensity that A sees is
A) I.
B) 9I.
C) 16I.
D) 36I.
E) 144I.
Answer: C
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An 80-g aluminum calorimeter contains 380 g of water at an equilibrium temperature of A piece of metal, initially at 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.
Consider a gun with a pellet that is more massive than the gun. The firing speed is greater for the
A) pellet. B) recoiling gun. C) both are the same D) none of the above
Explain the stage in which the solar system formed pretty much in a plane
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