Warm-Up Exercise 9

Due 2:00 pm, Tuesday, March 10

The buoyant force on an object totally submerged in a fluid depends on
the mass of the object,
the volume of the object, or
both.

Air flows from a pipe with large diameter into a pipe with smaller diameter. The pressure of the air in the small tube is
greater than,
less than, or
equal to
the pressure in the large tube.

Consider ice floating in a glass of water. When the ice melts, what will happen to the water level? Will it rise, fall, or remain where it was? Explain.
The level remains where it was. Before the ice melts, it displaces its weight in water. After it melts, it has the same weight, but now it's water, and the water from the ice exactly fills the space where water was displaced by the ice.

Suppose we have two jars of gas, one of helium and one of neon. If both jars have the same volume, and the two gases are at the same pressure and temperature, which jar contains the greatest number of gas molecules?
jar of helium
jar of neon
Both jars contain the same number.
Consider both gases to obey the ideal gas law. Also note that the mass of a neon molecule is greater than the mass of a helium molecule.

I mix some helium and neon gas together in the same container. The average kinetic energy per helium molecule is
greater than,
less than, or
equal to
the average kinetic energy per neon molecule.
Consider both gases to obey the ideal gas law. Also note that the mass of a neon molecule is greater than the mass of a helium molecule.
Note: The information needed to answer this question is in the section, "Kinetic Theory of Gases," which was not part of the reading assignment. Scan that section (in chapter 10) and try to find the information you need to answer this question.