The net charge difference across the membrane, just like the charge difference across the plates of a capacitor, is what leads to the voltage across the membrane. How much excess charge (in picocoulombs, where 1 pc = 1x10-12 C) must lie on either side of the membrane of an axon of length 2 cm to provide this potential difference (0.07 V) across the membrane? You may consider that a net positive charge with this value lies just outside the axon cell wall, and a negative charge with this value lies just inside cell wall, like the equal and opposite charges on capacitor plates. Previous Info:An average cylindrical axon has a cell wall that is d = 5 × 10 − 9 m thick and has a radius r = 5 × 10 − 6 m. The dielectric constant of the lipid bilayer κ = 7. Find the capacitance then of the axon cell wall membrane for an axon of length 4 cm. You may consider the cell membrane as having the geometry of a parallel plate capacitor by unrolling the cylinder, which yields parallel capacitor plates with an area A = 2 π r l where l = 1.0 cm is the length of the axon. Give your answer to the nearest nanofarad where 1 nanofarad = 1x10-9 F.

For problems 1-3, consider a simple dc brush motor with a permanent magnet stator. with an an consider a simple dc brush motor with a permanent magnet ae supply voltage of 100 v, the no-load speed of the motor is 1000 rpm. this motor can provide a torque of 1.9 n-m at 800 rpm drawing a current of 2 a current are both zero at no load.) 1. with an armature supply voltage of 100 v, the motor is operated at 900 rpm. what is the motor torque? what is the mechanical power delivered by the motor? what is the current draw? what is the electrical power input? what is the energy efficiency of the motor? with an armature supply voltage of 100 v, the motor is operated at 1100 rpm (where it acts as a generator). what torque input is required? what mechanical power is required what current is generated? what is the electrical power generated? what is the energy efficiency of the motor acting as a generator? 2. with an armature supply voltage raised to 120 v, the motor is operated at 1000 rpm. what is the no-load speed? what is the motor torque? what is the mechanical power delivered by the motor? what is the current draw? what is the electrical power input what is the energy efficiency of the motor? 3.

Which levels of government establish and implement educational requirements for minors

Ascientific blank must be testable and capable of being proven false?