In a real hemoglobin molecule, the tendency of oxygen to bind to a heme site increases as the other three heme sites become occupied. to model this effect in a simple way, imagine that a hemoglobin molecule has just two sites, either or both of which can be occupied. this system has four possible states (with only oxygen present). take the energy of the unoccupied state to be zero, the energies of the two singly occupied states to be -0.55 ev, and the energy of the doubly occupied state to be -1.3 ev (so the change in energy upon binding the second oxygen is -0.75 ev). as in the previous problem, calculate and plot the fraction of occupied sites as a function of the effective partial pressure of oxygen. compare to the graph from the previous problem (for independent sites). can you think of why this behavior is preferable for the function of hemoglobin?

a solenoid is created by wrapping a l = 90 m long wire around a hollow tube of diameter d = 4.5 cm.   the wire diameter is d = 0.9 mm.   the solenoid wire is then connected to a power supply so that a current of i = 9 a flows through the wire.

randomized variablesl = 90 m

d = 4.5 cm

d = 0.9 mm

i = 9 a                                          

write an expression for the number of turns, n, in the solenoid. you do not need to take into account the diameter of the wire in this calculation.

calculate the number of turns, n, in the solenoid.

write an expression for the length of the solenoid (l2) in terms of the diameter of the hollow tube d.

calculate the length of the solenoid (l2)   in meters.

calculate the magnitude of the magnetic field at the center of the solenoid in teslas.

explanation:

the temperature and the pressure affect solubility. temperature affects by changing the properties of the solvent. the increase in pressure increases solubility, the decrease in pressure decreases solubility.