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1. Explain why low-density polyethylene is good to make grocery bags, however, super high molecular weight polyethylene must be used where strength and very high wear resistance is needed.
2. The molecular weight of polymethyl methacrylate (see Table 16-3) is 250,000 g/mol. If all of the polymer chains are the same length,
(a) calculate the degree of polymerization, and
(b) the number of chains in 1 g of the polymer.
in an experimental study designed to simulate the manner in which a cat drinks a glass plunger simulating a cats tongue
At a section where the diameter is 4 in, methane flows with the veloctiy of 50ft/s and a pressure of 85 psia. At a downstream section, where the diameter has increased to 6 in, the pressure is 45 psia. Assuming the flow to be isothermal, compute the ..
Steam enters an adiabatic turbine 1MPa, 500 degree C and exits at 10 kPa. During this process, entropy is generated at .2 kj/kg-k. Determine the turbine efficiency.
Air (ideal gas) inside a cylinder filled with a frictionless piston undergoes a polytrophic process having an exponent n = 1.33. The initial pressure of the air is 3.34 MPa and the T (final) is 750 K and during the process the volume of the air is in..
twenty pounds of a gas mixture is contained in a tank with volume 30 cubic feet at 30 psia and 70 f. the gas mixture
the 2 mg car is being towed by a winch. if the winch exerts a force of t125s on the cable where 13m is the displacement
Application: Parameters of coaxial line. The RG-l1/U coaxial line has the following properties: Z0 = 75 Ω and vp = 2c/3 m/s. Assuming the line to be lossless, calculate its inductance and capacitance per unit length.
Assuming uniform shower flow, estimate the exit velocity from the showerhead jets. loss of the propellant, assuming that the exit gas has a molecular weight of 28.
1 when a computer is turned off its cpu begins to cool off. imagine that the internal energy of the cpu is given by u
The 60-mm diameter shaft rotates at 300 rev/min. this motion is caused by the unequal belt tensions on the pully of 800 N and 450 N. Determine the power transmitted and the maximum shear stress developed in the shaft.
Annular fins are integrally cast with the cylinder to increase heat transfer to the surroundings. Consider five such fins, which are of thickness t = 6 mm, length L = 20 mm, and equally spaced. What is the increase in heat transfer due to use of th..
the flow rate of liquid metal into the downsprue of a mold 1 ls. the cross-sectional area at the top of the sprue 800
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