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1. A cell membrane has a surface area of 1.00 x 10-7 m2, a dielectric constant of 6.01 and a thickness of 7.76 nm. The membrane acts like the dielectric in a parallel plate capacitor; a layer of positive ions on the outer surface and a layer of negative ions on the inner surface act as the capacitor plates. The potential difference between the "plates" is 82.3 mV. How much energy is stored in this capacitor?
2. How many positive ions are there on the outside of the membrane? Assume that all the ions are singly charged (charge +e).
A square plate of copper with 47.0 cm sides has no net charge, Find the charge density of each face of the plate
PRACTICE IT Use the worked example above to help you solve this problem. A proton is released from rest at x = ?2.00 cm in a constant electric field with magnitude 1.50 103 N/C pointing in the positive x-direction. (a) Assuming an initial speed of..
A 24.0 g copper ring at 0.000°C has an inner diameter of D = 2.54000 cm. An aluminum sphere at 103.0°C has a diameter of d = 2.54508 cm. What is the mass of the sphere
The hard drive memory of desk-top computer used for word processing has a capacity of 4.0GByte (GB). (A byte is the amount of memory needed to store one alphabetic character.) A single page of double-spaced text requires about 6kB of memory and a ..
A car moves with a constant acceleration of 2.1 m/s2. At a time of 1 s, it is 170 m beyond a mile marker, Find the car's position after the mile marker at time 5 s
A negative charge orbits a positive charge. The orbit is a perfect circle, What is the period of the orbit of the negative charge
A solenoid 1.63 m long and 2.23 cm in diameter carries a current of 24.9 A. The magnetic field inside the solenoid is 30.7 mT. Find the length of the wire forming the solenoid
A galvanometer has a coil resistance of 48.0 ?. It is to be made into a voltmeter with a full-scale deflection equal to 100.0 V. what size resistor should be placed in series with the galvanometer
A child pulls a friend in a little red wagon with constantspeed. How much work does the child do on the wagon
question1you encounters a moving walkway that is 91 long and has the speed of 2.1 relative to the ground. how long
A movig particle encounters an external electric field thatdecreases its kinetic energy from 9510 eV to 6610 eV as theparticle moves from position A to position B. Theelectric potential at A is -59.0 V, and that at Bis +24.0 V. Determine the charge o..
A steel (Young's modulus 2.0 x 1011 N/m2) wire is strung between two supports attached to a ceiling. What is the radius of the wire
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