Week 9

Read: Now you should definitely read Submerged Bodies (ASGv2 Chap. 15); Syringes, Siphons and Suckling Infants (ASGv2 Chap. 16); and Life Under a Sea of Air (ASGv2 Chap. 17).

Key topics: hydrostatic pressure, barometers, siphons, weighing earth's atmosphere, barometric formula (PHY 201 folks).
Homework:
1. Ice cube: A large ice cube, whose density is 0.917 g/cc, is placed in a glass. Water is then poured into the glass until the glass is full to the rim.
• First, what fraction of the ice cube is submerged?
• When the ice melts, will the water level overflow the glass, will it fall below the rim, or will it remain the same? Explain your answer.

Lab: Canoe Conundrum (Ex. 15.3), Bell Jar Laboratory (Ex. 16.6)

Chapter 15 (7 videos):

Canoe conundrum video?

Chapter 16 (6 videos):

Chain siphon videos (2 optional videos; only watch these if you are bored and have time on your hands): These two fun videos discuss the "siphoning" of a string of beads out of an elevated jar. Notice, however, that a string of beads is "siphoned" for a very different reason than the siphons we've been discussing. In particular: the siphoning action is -not- caused by atmospheric pressure. Rather, it is caused by the cohesion of the beads to one another. Strictly speaking, water could also be "siphoned", like these beads, without an atmosphere -if- the internal cohesion of water was strong enough (but it is not).

Chapter 17 (2 videos):

Physics 1