Consider a membrane with a surface potential of -100 mv. assume the membrane is a flat sheet. the salt concentration of the medium is 50 mm kcl and 5 mm mgcl2. the ph of the medium is 7.0.
a. plot the electrical potential, the [k+], the [cl-], and the ph as a function of distance from the membrane.
b. plot the charge density as a function of distance from the membrane.
c. estimate the charge per unit area of the membrane from the charge density plot.
d. plot the magnitude of the electric field as a function of distance from the membrane.
this is physics practice not biology

Ogle–2013–blg–0723 is an exoplanet that is similar to earth in size and proximity to its star. this exoplanet has mass m=4.18×1024kg and radius r=5.66×106m. an astronaut whose weight on earth is w=735n lands on the planet. a. calculate m, the mass of the astronaut. b. calculate gp? , the acceleration due to gravity on the surface of ogle–2013–blg–0723. c. calculate wp? , the weight of the astronaut on the surface of ogle–2013–blg–0723. d. calculate v, the minimum velocity required to put an object into orbit above ogle–2013–blg–0723. e. calculate t, the time required to complete an orbit around ogle–2013–blg–0723.

Which example has gravitational potential energy? a.a horse slowing down from a run b.an apple about to fall from a tree branch c.a bicycle being pedaled down a horizontal path d.beaker sitting on the floor

For the car in the picture ,in which direction is the normal force? -into the screen -down -out of the screen -up