Physics, 10.05.2020 08:57 griffislandon74
A model of a red blood cell portrays the cell as a spherical capacitor -- a positively charged liquid sphere of surface area A separated from the surrounding negatively charged fluid by a membrane of thickness t. Tiny electrodes introduced into the interior of the cell show a potential difference of 100 mV across the membrane. The membrane's thickness is estimated to be 95 nm and its dielectric constant is 5.00.
(a) If an average red blood cell has a mass of 1.00 10-12 kg, estimate the volume of the cell and thus find its surface area. The density of blood is 1100 kg/m3.
volume = 9.09e-16 m3
surface area = 4.548e-10 m2
(b) Estimate the capacitance of the cell. F
(c) Calculate the charge on the surface of the membrane. C
How many electronic (elementary) charges does the surface charge represent?
Answers: 2
Physics, 21.06.2019 21:20
Jason is a body builder. despite being more fit, he weighs more than his brother ryan, who is the same height. which is a possible reason? a. jason has more muscle mass than ryan does. b. jason has more body fat than ryan does. c. jason has more muscle mass and body fat than ryan does d. jason has less body fat than ryan does.
Answers: 1
Physics, 22.06.2019 12:30
An ice-making machine inside a refrigerator operates in a carnot cycle. it takes heat from liquid water at 0.0 degrees celsius and rejects heat to a room at a temperature of 19.2 degrees celsius. suppose that liquid water with a mass of 76.3kg at 0.0 degrees celsius is converted to ice at the same temperature. take the heat of fusion for water to be l_f = 3.34*10^5 j/kg.how much energy e must be supplied to the device? express your answer in joules.
Answers: 1
Physics, 22.06.2019 13:30
6–48 bananas are to be cooled from 24 to 138c at a rate of 215 kg/h by a refrigeration system. the power input to the refrigerator is 1.4 kw. determine the rate of cooling, in kj/ min, and the cop of the refrigerator. the specific heat of banana above freezing is 3.35 kj/kg·8c.
Answers: 3
A model of a red blood cell portrays the cell as a spherical capacitor -- a positively charged liqui...
Social Studies, 24.03.2021 15:20
Social Studies, 24.03.2021 15:20
Mathematics, 24.03.2021 15:20
Spanish, 24.03.2021 15:20
Social Studies, 24.03.2021 15:20
Biology, 24.03.2021 15:20
Chemistry, 24.03.2021 15:20
Mathematics, 24.03.2021 15:20
Mathematics, 24.03.2021 15:20
English, 24.03.2021 15:20
Chemistry, 24.03.2021 15:20
French, 24.03.2021 15:20