Physics 266 Lab I

- Find the magnitude of
the forces F
_{12}, F_{1b}, F_{1w}, and F_{2w}. That is find the forces in terms of W and q. - Check the solutions

**1)** Two
logs, each of weight W, lie in a trough with vertical walls in such a way that when
viewed end-on the line between their centers makes an angle q with the horizontal. The magnitude of the
forces on the bottom log due to the top log, the bottom of the trough, and one
wall on the trough are F_{12}, F_{1b}, and F_{1w},
respectively. Similarly the forces on the top log due to the bottom one and the
other wall are F_{21} and F_{2w}. Since F_{12} = F_{21},
three equations for static equilibrium are

-F_{12}
cos(q) + F_{1w} = 0

F_{1b}
- W - F_{12} sin(q) = 0

F_{12}
cos(q) - F_{2w} = 0

Assuming that all frictional forces are negligible. Find a fourth equation and use Maple to

**2)**Consider
the binding of nitric oxide to methemoglobin

Let K be the dissociation equilibrium constant so that

K = [NO][MetHb]/[MetHb-NO].

Take K to be 250 micromolar, expressing all values in micromolar, solve for how much free NO and MetHb are present when the initial concentrations of NO and MetHb are 30 and 1000 microlmolar.