# ps2 - PHY395S Problem Set 2 Due Thursday Feb 17th at 5:00pm...

This preview shows pages 1–2. Sign up to view the full content.

PHY395S: Problem Set 2 Due Thursday, Feb. 17 th at 5:00pm in Drop Box 25 Note: Q1-5 are each worth 3 marks, so the total problem set value is 15 marks. 1) Assume that the radioactive elements in the crust are uniformly distributed (i.e. H=constant). The surface heat flux is q y = 0 = q s ˆ j where q s =70 mW/m 2 , and the heat flow into the bottom of the crust is q y = y b = 1 3 q s ˆ j . Furthermore, k= 2.8 Wm -1 K -1 , T s = 0 C, and the temperature at the bottom of the crust (y b ) is 1500 C. Assuming a steady-state, what is the thickness of the crust y b ? (Your answer should be a numerical value) 2) In many geodynamic applications, it is most appropriate to consider the continental crust as a two layer system. Assume the upper layer, 15 km thick, has an internal heat generation ( ρΗ ) of 2.8 μ W/m 3 , and the lower layer, 30 km thick, has no internal heat generation. Assume that the heat flow at the bottom of the lower layer is 2 x 10 -2 W/m 2 , that the surface temperature is T=0 C and that the thermal conductivity is 2.5 W m -1 K -1 .

This preview has intentionally blurred sections. Sign up to view the full version.

View Full Document
This is the end of the preview. Sign up to access the rest of the document.

{[ snackBarMessage ]}

### What students are saying

• As a current student on this bumpy collegiate pathway, I stumbled upon Course Hero, where I can find study resources for nearly all my courses, get online help from tutors 24/7, and even share my old projects, papers, and lecture notes with other students.

Kiran Temple University Fox School of Business ‘17, Course Hero Intern

• I cannot even describe how much Course Hero helped me this summer. It’s truly become something I can always rely on and help me. In the end, I was not only able to survive summer classes, but I was able to thrive thanks to Course Hero.

Dana University of Pennsylvania ‘17, Course Hero Intern

• The ability to access any university’s resources through Course Hero proved invaluable in my case. I was behind on Tulane coursework and actually used UCLA’s materials to help me move forward and get everything together on time.

Jill Tulane University ‘16, Course Hero Intern