# Week 8

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,

PHY 201 Lecture: Atmospheric pressure, compressible fluids, and the barometric formula.
Quiz: Quiz covering week 7 material.

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. (a) First, what fraction of the ice cube is submerged? (b) 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.
2. Hydrostatic Pressure and Buoyancy (Ex. 15.1)
3. Valved Siphon (Ex. 16.4)
4. Weighing Venus' Atmosphere (Ex. 17.2)

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

Chapter 15 (7 videos)

Chapter 16 (6 videos):

Chapter 17 (2 videos):

Chain siphon videos (2 optional videos): 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).

Physics 1