fixed oxide charge

Consider an aluminum gate-silicon dioxide p type silicon MOS structure with tox=450 angstroms. The silicon doping is Na=2x10^11cm^-3 and the flat-band voltage is Vfb=-1.0V. Determine the fixed oxide charge Q'ss.

flatband and threshold voltages

An Al-silicon dioxide-silicon MOS capacitor has an oxide thickness of 450Angstroms and a doping of Na=10^15 cm^-3. The oxide charge density is Q'ss=3x10^11cm^-2. Calculate (a) the flat-band voltage and (b) the threshold voltage. Sketch the electric field through the structure at the onset of inversion.

How does a roller coaster create brain injury by impulsive inertial loading.

I have a subject who sustained acute bilateral subdural hematomas. I need to explain the mechanics of how this injury was sustained by subject who rode a roller coaster which accelerated from 0 to 54 mph in 4 seconds pulling 4.5 g's. The point of contact was with the headrests and subjects head.

A 324 lb. man rides a roller coaster and suffers a brain injury.

What is the force with which the 324 man is assaulted if the roller coaster accelerates from 0 to 54 mph in 4 seconds and generates 4.5 g's during acceleration. Impulsive inertial loading creates injury upon contact between his head and the headrest during deceleration. It upon deceleration that the impact occurs. What is the level of the force created upon this 324 man during this roller coaster ride? Don't know the rate of deceleration. Lim's are used to power the roller coaster which "shoot" it out of a starting agte. It goes through 30 vertical tuyrns, 25 compound turns and 4 inversions. If the 4.5 g's exert 445.44 (appx.) newtons on a person of average weight 70 kg p, i.e. pers... click for more

Packing, calculation of density

Physics, Solid State Physics Year 4 Packing, calculation of density, etc, -------------------------------------------------------------------------------- I do not know how to show this problem exclusively to you but I just put your name on tope instead. Please write very clearly so that I can read the material well. Please be very detailed especially in math because my mathematical skills are very weak. All the problems I need to know how to solve are on the attachment. Please only solve problem 3 on the attachment. . (See attached file for full problem description)