## Homework Physics 471J fall 2016

**Please make sure your name is on all of your homeworks!**

**Homework 1 due ****10/12/16**

Do not look up **anything** when trying these problems. Show, initial guess and all steps in making OOM approximation.

1) What is the mass of a cow?

2) What is a range of flows for the Chena river?

**Homework 2 due ****10/19/16 **

Do not look up **anything** when trying these problems. Show, initial guess and all steps in making OOM approximation.

1) Imagine a long steel rod hanging under its own weight. How does the maximum length before it breaks depend on its cross-sectional area? Remember the max yield stress is the max force over the area.

2) Given the mass of the sun is ~2 x10^30 kg and the radius of the earth is ~6x10^6 m. Estimate the mass of earth and the ratio mass of sun/mass of earth

**Homework 3 due ****10/26/16 **

Last updated **
14 October, 2016
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