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Bundles of protein filaments inside tissue cells are structural elements that can generate contractile
force against the materials to which they adhere. Figure 3 shows struts called "stress fibers" that extend from one end of the cell to the other. These fibers are made of crosslinked, filamentous actin, with an average diameter of 2 µm and an effective "stiffness" E of 16 kN/m2.
If we assume the connections at either end of the stress fiber can be modeled as pins, how much force P,would the cell need to generate to buckle the longest of these stress fibers?
a viscous incompressible newtonian fluid flows down a vertical wall. the liquid is exposed to atmospheric pressure and
Using the knon height and calculated base lenghth, what is the length of the slope of the ramp.
Air in a piston-cylinder device is compressed from an initial state (temperature = 80 °C, pressure = 100 kPa, volume = 0.3 m3) to a final state (temperature = 250 °C, pressure = 600 kPa), during a polytropic process (n = 1.28094065700868). What is th..
The drag, d, on a washer-shaped plate placed normal to a stream of fluid can be expressed as D = f(d1, d2, V, μ, ρ) where d1 is the outer diameter, d2 the inner diameter, V the fluid velocity, µ the fluid viscosity, and ρ the fluid density. Some ..
Steam at 75 kPa and 13 percent quality is contained in a spring-loaded piston-cylinder device, as shown in the figure, with an initial volume of 5.28 m^3. Steam is now heated until its volume is 13.20 m^3 and its pressure is 300 kPa.
Water flows in a rectangular duct that is 6-cm high and 8-cm wide (into the paper) with the following velocity profile. The velocity at the centerline of the duct is 10 m/s. Calculate the average velocity, mass flow rate and volume flow rate in the d..
a rigid tank contains a two-phase mixture consisting of 0.2 lb of liquid water and 0.1 lb of water vapor initially at a
When a fast-breeder reactor is shut down quickly, the temperature of the surface of a number of components drops from 600°C to 400°C in less than a second. These components are made of a stainless steel and have a thick section the bulk of which r..
air enters a one-inlet one-exit control volume at 6 bar 500 k and 30 ms through a flow area of 28 cm2. at the exit the
consider refrigerant r-134a flowing in a smooth horizontal 10-mm-inner-diameter tube of wall thickness 2 mm. the
the gases in the cylinder of an internal combustion engine have a specific internal energy of 800 kjkg and a specific
a steady-flow compressor is used to compress helium from 15 psia and 70of at the inlet to 200 psia and 600of at the
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