# Week 7 SUSTAIN Spring 2015

Elasticity, Fluids.

Day 1: Monday: I’ve posted a response to your feedback on the main webpage.
Before Class: Read all of chapter 11: 11.1-11.9. You’ll find that most of the beginning is review, so you may not need to actually read it, but just check what it is. Try to do problems 11.5, 11.11, 11.14-11.16, 11.23, 11.25, 11.27, 11.40.
Make sure you know:
a) Relationship between pressure and force, be able to explain how hydraulics work – with recognition that it is energy not force that is conserved!
b) Use Archimedes Principle – that a body in a liquid experiences a buoyant force = to the weight of the displaced liquid.

In Class:

Day 2: Tuesday 180-262:
Before Tuesday’s Class: see video about how air pressure drops off exponentially with elevation.
I posted “solutions” for PS#4 and PS#5. They are rough and incomplete. However, I think that they are correct.
Make sure you know:
a) Relationship between pressure and force, be able to explain how hydraulics work – with recognition that it is energy not force that is conserved!
b) Use Archimedes Principle – that a body in a liquid experiences a buoyant force = to the weight of the displaced liquid.

In Class: Big Exam #6

Day 3: Wednesday: 180-269
Before lab: Review lenses

I set up an online homework called LON-CAPA at http://loncapa.calpoly.edu/. To get started,

1. Go to the website and click the “Forgot password?” link.
2. Enter your regular Cal Poly username (e.g. “pschwart”) and e-mail address (e.g. “pschwart@calpoly.edu“).
3. Leave the domain set to “calpoly” and click “Proceed.
4. Within several minutes, you’ll receive an email with instructions to log in.
5. You will need to set a new password that is just for LON-CAPA.

I posted “solutions” for PS#4 and PS#5. They are rough and incomplete. However, I think that they are correct.
During Lab: Make lots of optical devices

Day 4: Thursday Meet in 180-262,
Before Class: Prepare for Midterm #2

In Class: Take Midterm #2