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  3. 1 to examine the forces that occur within the spectrinactin...

Question: 1 to examine the forces that occur within the spectrinactin...

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1. To examine the forces that occur within the spectrin-actin network that adds structural integrity to the cell membrane of red blood cells, lets consider a section of the network and model it as a truss as shown in Figure 1. The truss is comprised of members of length a 200 nm (nm-nanometer-10% m). Thus, each of the small triangles (e.g. ABC, BDC, etc.) is an equilateral triangle with each side of the triangle having length a 200 nm. A force F 200 pN (pN picoNewton 1012 N) is applied vertically at joint C, and a force F 200 pN (pN picoNewton 10 N) is applied vertically at joint D, as shown. a. Determine the reaction force at E Hint: you can express this as a magnitude and direction or as a vector if you tell the coordinate system youre using. Be sure to include units on your answers b. Determine the reaction force at A Hint: you can express this as a magnitude and direction or as a vector if you tell the coordinate svstem youre using Figure 1. Schematic of truss. The length of each member (e.g. AC, CD, etc.) is a 200 nm. A force F 200 pN is applied to vertically downward at point C and a force F 200 pN is applied to vertically downward at point D. C. Determine the magnitude of the force in member AC d. Determine the magnitude of the force in member AB. e. Determine the magnitude of the force in member BC f. Determine whether members AC, AB, and BC are loaded in tension or compression. Hint: the answer isnt necessarily the same for each.

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