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A potential difference of 80 mV exists between the inner and outer surfaces of a cell membrane. The inner surface is negative relative to the outer surface. How much work is required to eject a positive sodium ion (Na+) from the interior of the cell?
Find the change in speed of a rock thrown straight down from the top of the wall at an initial speed of 7.90 m/s and moving between the same two points
A proton orbits a long charged wire, making 1.60 x 10^6 revolutions per second. The radius of the orbit is 1.40cm. What is the wire's linear charge density
A plank 2.00 cm thick and 15.7 cm wide is firmly attached to the railing of a ship by clamps so that the rest of the board extends 2.00 m horizontally over the sea below. find the shear modulus of the wood
Consider a hoop of mass 2.1 kg and radius 0.57 m that rolls without slipping down an incline. What forces act on the hoop
Rate Equations in a Four-Level Laser. Consider a four-level laser with an active volume V = 1 cm ^3 . The population densities of the upper and lower laser levels are N 2 and N 1 and N = N 2 - N 1 . The pumping rate is such that the steady-state p..
A person is riding a bicycle, and its wheels have an angular velocity of 10.6 rad/s. How much time does it take for the bike to come to rest
Two identical point charges are fixed to diagonally opposite corners of a square that is 0.455 m on a side. Each charge is +2.70 10-6 C. How much work is done by the electric force as one of the charges moves to an empty corner?
Consider an RC circuit with E = 12.0, R= 195 ohms, and C = 55.8 micro farrads. Find the initial current in the circuit
A 2500 kg satellite is to be launched and put in orbit at 750km above the surface of the earth. What gravitational force will the satellite experience? How fast is the Satellite traveling in orbit?
A physics professor, equipped with a rocket backpack, steps out of a helicopter at an altitude of 592 m with zero initial velocity. (Neglect air resistance.), What is the duration of her slowing-down period
A gun fires a bullet with muzzle velocity 0.6c. If an alien is on a spaceship which moves at 0.8c and fires the gun in the forward direction, what is the bullet's velocity according to you
A sport utility vehicle (SUV) and a sports car travel around the same horizontal curve. The SUV has a static stability factor of 0.74, At what maximum speed can the sports car negotiate the curve without rolling over
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