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A cell membrane has a resistance and a capacitance and thus a characteristic time constant. What is the time constant of a 8.5nm -thick membrane surrounding a 4.0×10^-2mm -diameter spherical cell? Assume the resistivity of the cell membrane as 3.6×10^6 ?×m and the dielectric constant is approximately 9.0.
Consider a neutron star whose mass is twice the mass of the Sun and whose radius is 14.1 km. What is the radius of the geostationary orbit for this neutron star
You took a job as a space station scientist. On a spacewalk you get separated from the station. At what speed will you move back toward the station
A cubical piece of heat-shield-tile from the space shuttle measures 0.12 m on a side and has a thermal conductivity of 0.065 J/(s·m·C°). The outer surface of the tile is heated to a temperature of 1110°C, while the inner surface is maintained at a..
In an experiment designed to measure the speed of light, a laser isaimed at a mirror that is 59.0 km due north. A detector is placed122 m due east of the laser. The mirror is to be aligned so thatlight from the laser refelects into the detector.
Vector B has magnitude of 8.0 at an angle of -10.0 o from the x-axis. Let C=A+B. Let D=A-B. Let V=2*A-B. What is the x-component of vector C. What is the y-component of vector C.
A yo-yo is made of two solid cylindrical disks, each of mass 0.051 and diameter 0.080 , joined by a (concentric) thin solid cylindrical hub of mass 0.0049 and diameter 0.012. What fraction of its kinetic energy is rotational
is it possible for both the pressure and volume of a monatomic ideal gas to change without causing the internal energy
A water droplet of radius 0.015 mm remains hanging stationary in the air. If the electric field of Earth is 100 N/C, how many electrons must the water droplet lack? In which direction the electric field of Earth must be directed for that problem to m..
A weightlifter lifts 50 kg a total vertical distance of 0.28 m at a constant speed in 1.00 seconds. What power was exerted
q1. on a frictionless horizontal surface. the spring is compressed 4.0 cm and released from rest.a determine the
The position of an object connected to a spring varies with time according to the expression x = (4.3 cm) sin(6.9?t). Find the amplitude and frequency of the motion
You keep your coffee in a sealable thermal mug which has thermal conductivity k-0.036 W/m k. how long (in minutes) will it take the coffee to cool down
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