13. A kettle is filled with water and the pressure at the bottom of the container is P. The kettle is later emptied halfway and topped with oil with a density of 0.8 × 103 kg/m3 , which floats on top of the water. What is the pressure at the bottom of the container now? a. new pressure < P b. the same pressure P c. new pressure > P d. Not enough information given.
13. A kettle is filled with water and the pressure at the bottom of the container is P. The
kettle is later emptied halfway and topped with oil with a density of 0.8 × 103
kg/m3
,
which floats on top of the water. What is the pressure at the bottom of the container
now?
a. new pressure < P
b. the same pressure P
c. new pressure > P
d. Not enough information given.
14. A water molecule moves at +4 m/s collides head on elastically with another water
molecule moving at −4 m/s. What is the velocity of the water molecules after the
collision?
a. Neither is moving.
b. −4 m/s, +4 m/s
c. +4 m/s, −4 m/s
d. −14 m/s, +14 m/s
15. What is the temperature of a system in thermal equilibrium with another system made up
of water and steam at 1 atm?
a. 0°F
b. 273 K
c. 0 K
d. 100°C
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