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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 state trooper chases a speeder along a straight stretch of road; both vehicles move at 136 km/h. The siren on the tropper's vehicle produces a sound of 490 Hz. What frequency is heard by speeder? (Take the speed of sound in air to be 343 m/s.)
Three forces act on a body which moves with constant velocity. One force is 9 N acting at an angle of 70°, What is the angle of the third force
The active element of a certain laser is an ordinary glass rod 21.6 cm long and 1.22 cm in diameter. Calculate its increase in diameter
bloodhound a 1000 mph super-sonic car can accelerate from a standing start to 1000 mph in less than 42s. during this
You throw a 151 g ball straight up to a height of 43.0 m. Calculate the average force exerted by your hand while you are throwing it
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in the large hadron collider lhc located at cern in france and switzerland protons move in a circle of radius 4.96km.
A sign (mass 1700kg ) hangs from the end of a vertical steel girder with a cross-sectional area of 0.013m^2, What is the stress within the girder
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The rms current in a copy machine is 5.26 A, and the resistance of the machine is 19.7?. find the peak power delivered to the machine
A 15.0-µC particle with a mass of 2.80 10?5 kg moves perpendicular to a 1.01-T magnetic field in a circular path of radius 28.0 m. How long will it take the particle to complete one orbit
A 4.6muC charge is at the center of a cube 6.5 cm on each side. What is the electric flux through one face of the cube
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