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Suppose biological cell membrane has a specific capacitance of ~1μF/cm^2. Calculate the capacitance of a typical cell with diameter of ~10 μm. Suppose the membrane potential is -60mV, calculate the amount of net charge kept inside the cell. Calculate how many Na+ ions need to go across the membrane to alter the membrane potential from -60mV to 40 mV. Note: The charge of a single Na+ ion = 1.602x 10^(-19) C (Reference: https://www.scholarpedia.org/article/Electrical_properties_of_cell_membranes)
The left end of a long glass rod 8.00cm in diameter and with an index of refraction of 1.60 is ground and polished to a convex hemispherical surface with a radius of 4.00cm. Find the height of the image formed by paraxial rays incident on the conv..
A large fake cookie sliding on a horizontal surface is attached toone end of a horizontal spring with springconstant k = 440 N/m; What will be the kinetic energy of the cookie as it slides back through the equilibrium position
A ball with a mass of 0.65 kg is dropped on a table. The initial height of the ball is 0.85 meters. Calculate the change in the momentum of the ball during its collision with the table
A visual binary system is at a distance of 5.0 pc. The distance between the two stars subtends an angle of 4.5 arcseconds. What is the mass of each of the stars
A baseball pitcher throws a fastball at a speed of 45.00m/s. The acceleration occurs as the pitcher holds the ball in his hand and moves it throughout an almost straight-line distance of 4.0 m. compute the acceleration; assume that it is constant ..
A small package is fired off Earth's surface with an unknown launchspeed at a 42.0^\circ angle with the local horizontal. What was the launch speed of the package
A heat pump has a coefficient of performance of 3.90, How much energy does it deliver into a home during 12 h of continuous operation
A cosmic ray proton streaks through the lab with velocity 0.80c at an angle of 49° with the +x direction, Compute the magnitude and direction of the proton's velocity when viewed from frame S'
At this point you are getting very tired and would like to get back as quickly as possible, but all of the available trails seem to lead you deeper into the woods. You would like to take a shortcut directly through the woods (ignoring the trails)...
A car slows down uniformly from a speed of 24.0 m/s to rest in 4.00 s. How far did it travel in that time
Determine the orbital speed of a satellite that circles the Earth with a period of 2.50 104 s. The mass of the Earth is 5.97 1024 k
A boy is trying to retrieve his toast from a toaster using a metal knife. He touches one of the wires inside, which is connected to 120 V. What is the current through his body
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