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The inner and outer surfaces of a cell membrane carry a negative and positive charge, respectively. Because of these charges, a potential difference of about 0.077 V exists across the membrane. The thickness of the membrane is 8.1 x 10-9 m. What is the magnitude of the electric field in the membrane?
Uniform rate of acceleration
what time delay Delta t is necessary. A boxcar of mass 600 tons at rest becomes uncoupled on a 5.00 grade. If the track is considered to be frictionless, what speed does the boxcar have after 15 seconds.
How to find out the elapsed time
A large tanker truck can carry 30 ton (30,000 lb) of liquid. (a) What volume of water can it carry? (b) What volume of gasoline can it carry.
A spring with spring constant 12.5 hangs from the ceiling. A 400 ball is attached to the spring and allowed to come to rest. It is then pulled down 6.80 and released. What is the time constant if the ball's amplitude has decreased to 3.90 after 57.0 ..
Find out the magnitude of the vertical component of the velocity
A car takes 11 s to go from v = 0 to v = 75 m/s at approximately constant acceleration. If you wish to find the distance travelled using equation d = 1/2 at2, what value should you use for a.
A particle of mass m moves next to the x axis. Its position varies with time according to x=(3m/s^3)t^3-(4m/s^2)t^2.
A diver releases an air bubble of volume 2.9 cm3 from the depth of 18 m below the surface of a lake, where the temperature is 7.2°C. What is volume of the bubble when it reaches just below the surface of the lake, where the temperature is 22°C.
A circular wire loop of radius 0.50 m lies in a plane vertical to a uniform magnetic field of magnitude 0.40 T. If in 0.10 s the wire is reshaped from a circle to a square, but remains in the plane, what is magnitude of the average induced emf in t..
How long can craft hover over the moon surface Contract between Einstein's calculations and observed precession
A 17-kg projectile is fired at an angle of 60° above the horizontal and with a speed of 240 m/s. At the highest point of its trajectory the projectile explodes into two fragments with equal mass, one of which falls vertically with zero initial spe..
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