What are cnidocytes? What is the name of the organelle inside cnidocytes? What are the biologica functions of this structure?
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- What is unit of modulus of elasticity? What is unit of surface tension?A dry rock weighs 250 grams and has a bulk density of 2.5 grams per cubic centimeter. When saturated with pure water at room temperature (T = 25 °C), it weighs 260 grams. At room temperature, specific volume of water is 1.00295E-03 m^3/kg. Calculate the porosity of the sample.Nylon 6,6 is a thermoplastic polymer with high mechanical strength, high resistance to chemical environments, and good stability under heat. Therefore, it is well suited to be used in 3D structural objects. A cylindrical nylon 6,6 pipe is made by injection molding. The pipe is 1 m long with an outer diameter of 8cm, and a thickness of 2mm. The crystallinity of the pipe is 25%. The density and associated percent crystallinity for two nylon 6,6 samples are measured as below: ρ(g/cm3) crystallinity (%) 1.190 67 1.155 44 If the degree of polymerization is 500, calculate the number of chains in the pipe. (Assume the chains are equal in length).
- Nylon 6,6 is a thermoplastic polymer with high mechanical strength, high resistance to chemical environments, and good stability under heat. Therefore, it is well suited to be used in 3D structural objects. A cylindrical nylon 6,6 pipe is made by injection molding. The pipe is 1 m long with an outer diameter of 8cm, and a thickness of 2mm. The crystallinity of the pipe is 25%. The density and associated percent crystallinity for two nylon 6,6 samples are measured as below: ρ(g/cm3) crystallinity (%) 1.190 67 1.155 44 Calculate the density of this pipe, which has 25% crystallinity.Calculate the heat capacity of liquid water per molecule, in terms of k. Suppose (incorrectly) that all the thermal energy of water is stored in quadratic degrees of freedom. How many degrees of freedom would each molecule have to have?6. If we approximate the atmosphere to be 79% Nitrogen (N2) by volume and 21% oxygen (O2), estimate the density of air (kg/m3) and ppmv at 1 atmosphere and ambient temperatures of 40 C and 450 C. (Atomic weight of nitrogen=14)
- How many nanostructured dimensions does a C nanotube have? Does a C nanotube with its nanostructured dimensions always have the same properties? If not, explain what the electrical conductivity properties in a nanotube depend on?What sort of material is this? What are the viscosity and spring constant of the material? What is the time threshold that determines whether the material acts as a liquid or solid? What is the characteristic frequency of the material? What real world material property does this model describe?Thermal Diffusivity Estimate the thermal diffusivity of butter at 20°C.
- Intense research is underway to develop adiabatic engines that require no cooling of the engine block. Such engines are based on ceramic materials because of the ability of such materials to withstand high temperatures. Write an essay on the current status of adiabatic engine development. Also determine the highest possible efficiencies with these engines, and compare them to the highest possible efficiencies of current engines.Nanotechnology, the field of building ultrasmall structures one atom at a time, has progressed in recent years. One potential application of nanotechnology is the construction of artificial cells. The simplest cells would probably mimic red blood cells, the body’s oxygen transporters. Nanocontainers, perhaps constructed of carbon, could be pumped full of oxygen and injected into a person’s bloodstream. If the person needed additional oxygen—due to a heart attack or for the purpose of space travel, for example—these containers could slowly release oxygen into the blood, allowing tissues that would otherwise die to remain alive. Suppose that the nanocontainers were cubic and had an edge length of 25 nanometers. What is the volume of one nanocontainer? (Ignore the thickness of the nanocontainer’s wall.)Nanotechnology, the field of building ultrasmall structures one atom at a time, has progressed in recent years. One potential application of nanotechnology is the construction of artificial cells. The simplest cells would probably mimic red blood cells, the body’s oxygen transporters. Nanocontainers, perhaps constructed of carbon, could be pumped full of oxygen and injected into a person’s bloodstream. If the person needed additional oxygen—due to a heart attack or for the purpose of space travel, for example—these containers could slowly release oxygen into the blood, allowing tissues that would otherwise die to remain alive. Suppose that the nanocontainers were cubic and had an edge length of 25 nanometers. Suppose that each nanocontainer could contain pure oxygen pressurized to a density of 85 g/L. How many grams of oxygen could be contained by each nanocontainer?