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Physics, 23.06.2019 00:10
During cooling, the kinetic energy of the molecules falls. why does this happen? a.the motion of the molecules increases. b. the motion of the molecules slows down. c.the van der waals forces between molecules decrease d. the forces of attraction between the molecules are overcome.
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Physics, 23.06.2019 00:30
What practical value did astronomy offer to ancient civilizations?
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Physics, 23.06.2019 02:40
If a rock is thrown upward on the planet mars with a velocity of 10 mys, its height in meters t seconds later is given by y β 10t 2 1.86t 2 . (a) find the average velocity over the given time intervals: (i) [1, 2] (ii) [1, 1.5] (iii) [1, 1.1] (iv) [1, 1.01] (v) [1, 1.001] (b) estimate the instantaneous velocity when t β 1.
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Physics, 23.06.2019 08:00
Use henry's law and the solubilities given below to calculate the total volume of nitrogen and oxygen gas that should bubble out of 1.7 l of water upon warming from 25 Λc to 50 Λc. assume that the water is initially saturated with nitrogen and oxygen gas at 25 Λc and a total pressure of 1.0 atm. assume that the gas bubbles out at a temperature of 50 Λc. the solubility of oxygen gas at 50 Λc is 27.8 mg/l at an oxygen pressure of 1.00 atm. the solubility of nitrogen gas at 50 Λc is 14.6 mg/l at a nitrogen pressure of 1.00 atm. assume that the air above the water contains an oxygen partial pressure of 0.21 atm and a nitrogen partial pressure of 0.78 atm.
Answers: 2
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