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A typical cell membrane is 7.1 nm thick and has an electrical resistivity of 1.3 x 10^7 m. If the potential difference between the inner and outer surfaces of a cell membrane is 70mV, how much current flows through an area of 1.0 m^2 of the membrane?
Suppose the thickness of the membrance is doubled, but the resistivity and potential difference remain the same. Does the current increase or decrease?
By what factor does the current increase or decrease?
q1. a 21-cm-long zero-resistance wire is pulled outward on zero-resistance rails at a steady speed of 1.0 in a 0.10
A car started frm rest and accelerated for 5s at 6.00m/s2.Then it stayed at a constant speed for 20 s. It next slowed down at 3m/s2 until it came to a stop? how far did it travel during the first 5 s.
The potential difference across a cell membrane form outside to inside is initially at -90 mV (when in its resting phase). How many ions move through the membrane
A hare and a tortoise compete in a race over a straight course 2.25 km long. The tortoise crawls at a speed of 0.180 m/s toward the finish line. For how long in time was the hare stationary
A 2.0 N force is applied to the plunger of a hypodermic needle. The diameter of the plunger is 1.2 cm and that of the needle is 0.30 mm. With what force does the fluid leave the needle
An artillery shell of mass 10.00 kg, lying at rest on the ground, accidentally detonates, exploding into three pieces of shrapnel. find the angle at which the remaining piece of shrapnel travels
at some point in space,the x and y components of the electric field are Ex= 1.73 N/C, respectively and Ey= 3.75 N/, respectively. What is the net charge of the particle
A golf club makes impact with a 0.045 kg golf ball during a drive off the tee. The loft angle of the club (the angle between the club face and vertical) is 10 degrees. What is the direction of this resultant force
q1. wire carries a stable current of 2.60 a. a straight section of the wire is 0.750 m long and lies along the x axis
A 0.156kg toy is undergoing SHM on the end of a horizontal spring with force constant 306 N/m. Find the maximum speed attained by the object during its motion
A 20-cm-radius ball is uniformly charge to 80nC. What is the ball's volume charge density and How much charge is enclosed by spheres of radii 5, 10 and 20 cm
A plastic film of thickness 290 nm appears to be green (?green = 510 nm), What is the plastic's index of refraction
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