The average density of each planet in the solar system is determined by taking its mass and dividing that by its:
A) radius.
B) diameter.
C) surface area.
D) radius squared.
E) volume.
E
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By the time the Universe was about two minutes old, protons and neutrons could link to form _____, the nucleus of a heavy hydrogen atom, and not be broken apart again
A) uranium B) helium C) nitrogen D) deuterium
Compared to a sound of 40 decibels, the intensity of a sound of 50 decibels is
A) 10 times as much. B) 100 times as much. C) 1000 times as much. D) 10,000 times as much. E) more than 10,000 times as much.
What is the change in entropy of the lead when 2.0 kg of molten lead solidifies? [Data: Lv = 207. kcal/kg at 1744.°C; Lf = 5.9 kcal/kg at 328.°C]
What will be an ideal response?
Which of the following is true?
1.A moving car with constant acceleration can never stop and stay stopped. 2.If a car is traveling eastward, its acceleration is eastward. 3.If a car is slowing down, its acceleration must be negative. 4.If a car is speeding up, its acceleration must be greater than zero.