Explain why modulus of elasticity of simple thermoplastic
Explain why the modulus of elasticity of simple thermoplastic polymers, such as polyethylene and polystyrene, is expected to be low compared with that of metals and ceramics.
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Boron has a much lower coefficient of thermal expansion than aluminum, even though both are in the 3 B column of the periodic table. Explain, base on bonding energy, atomic size, and the energy well, why this difference is expected.
The partition is now removed, and the water expands to fill the entire tank. Determine the entropy change of water during this process if the final pressure in the tank is 40kPa.
The outlet area and velocity are 0.001 m^2 and 30m/s and the inlet velocity is 15 m/s. Determine the mass flow rate and the inlet area.
You are given three resistors, each of 10 kQ, and a 9-V battery whose negative terminal is connected to ground. With a voltage divider using some or all of your resistors, how many positive-voltage sources of magnitude less than 9 V can you design?
Steel is coated with thin layer pf ceramic to help protect against corrosion. what do you expect to happen to the coating when the temperature of the steel is increased significantly? Explain.
We have an urn with three green balls and two yellow balls. We pick a sample of two without replacement and put these two balls in a second urn. Next we sample two balls from the second urn with replacement.
how many positive-voltage sources of magnitude less than 9 V can you design? List them in order, smallest first. What is the output resistance (i.e., the Thevenin resistance) of each?
Air contained in a piston-cylinder assembly contains air, initially at 2 bar, 300 K and a volume of 2 m^3. The air undergoes a process to a state where pressure is 1 bar, during which the pressure-volume relationship is PV=constant.
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