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A typical cell has a membrane potential of -70 mV, meaning that the potential inside the cell is 70 mV less than the potential outside due to a layer of negative charge on the inner surface of the cell wall and a layer of positive charge on the outer surface. This effectively makes the cell wall a charged capacitor. Because a cell's diameter is much larger than the wall thickness, it is reasonable to ignore the curvature of the cell and think of it as a parallel-plate capacitor.How much energy is stored in the electric field of a 50-μm-diameter cell with a 7.0-nm-thick cell wall whose dielectric constant is 9.0? Express your answer to two significant figures and include the appropriate units.
A water tower, vented to the atmosphere, is drained by a pipe that extends to the ground. what is the absolute pressure in the drain pipe at ground level
A small loop of area A=7.4 mm^2 is inside a long solenoid that has n=747 turns/cm, find the amplitude of the emf induced in the loop
A certain freely falling object requires 1.6s to travel the last 38.00m before it hits the ground. From what height above the ground did it fall.
The drill pipe has an outer diameter of 75 mm, a wall thickness of 6 mm, and a weight of 0.8 kN/m. If it is subjected to a torque and axial load as shown, determine the principal stresses and maximum in-plane shear stress
A 1.10-mol sample of hydrogen gas is heated at constant pressure from 304 K to 422 K. Calculate the increase in its internal energy
The record distance in the sport of throwing cowpats is 81.1 m. This record toss was set by Steve Urner of the United States in 1981, Determine the initial speed of the projectile
The ramp is inclined at 30.0° with respect to the horizontal. The coefficient of kinetic friction between the log and the ramp is 0.800, and the log has an acceleration of 0.800 m/s2. Find out the tension in the rope.
If the parachutist comes to rest with fix acceleration over a distance of 0.660 meter, find what force does the ground exerts on her
When seven people whose average mass is 83 kg sit down in a car, they ?nd that the car drops 0.99 cm lower on its springs. What is the frequency of the car's vibration
A glass capillary tube with a diameter of 0.42 mm and length 11 cm is filled with a salt solution with a resistivity of 0.20 ohm•m. What is the resistance
A single-turn square loop of side Lis centered on the axis of a long solenoid. In addition, the planeof the square loop is perpendicular to the axis of the solenoid. The solenoid has 1460 turns per meterand a diameter of 4.00 cm, and carries a cur..
An all-terrain vehicle of 2000 kg mass moves up a 15 degree slope at a constant velocity of 6 m/s. The rate of change of gravitational potential energy with time is
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