A thin rectangular piece of wood floats in water. You slowly pour oil with a density equal to that of the wood on the surface of the water until the height of the oil above the water is twice the height of the piece of wood. Which statement is correct?
A. The wood floats on top of the oil, so it sticks up in the air.
B. The wood does not change its position
C. The wood sinks below the surface of the water.
D. The wood is half in the water and half in the oil.
E. The wood floats in the oil just above the water.
Answer: E
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At the microscopic level, the difference between liquids and solids is that
A) in a liquid, the individual atoms are larger. B) the liquid's atoms move throughout the liquid, while the solid's atoms remain near their original locations. C) there is much more distance [at least 10 times more] between neighboring atoms in a liquid than between neighboring atoms in a solid. D) both answers A and B are correct. E) both answers B and C are correct.
The vapor pressure of water at 20°C is 2330 Pa. Suppose that you build a barometer that uses water as its working fluid instead of mercury
What would the height of the column of water be when the external pressure is 101 kPa and the water temperature is 20°C? A) 10.1 m B) 10.3 m C) 10.5 m D) 10.7 m E) 10.9 m
CFCs are
a. alcohols. b. hydrocarbons. c. alkyl halides. d. amides.
Recycling steel is more energy-efficient than recycling aluminum
What will be an ideal response?