Physics

Solution Library


Calculation of Combined PACF of the Transformer

Question In a single -phase wattmeter application at full load, the potential transformer phase-angle error gamma is -9 and the current transformer phase angle error beta is -3. If the load operates at a 0.90 leading pf, the combined PACF of the transformer is Summary: This question belongs to ele ... Read More

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Quantitative and Qualitative Assessment of a Reactor

Question Find the most suitable reactor for the situation posed. The company you work for makes a product, GREATSTUFF (G). To make G, reactants NEEDED (N) and ALSO (A) are used. Therefore, G, is made by the following reaction (1):             ... Read More

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Stress Required to Stretch the Sample to 25 cm Length

Question A strip of elastomer 1 cm x 1 cm x 10 cm is stretched to 25-cm length at 25°C, a stress of 1.5 x 10-7 dynes/cm2 being required. a) Assuming a tetrafunctional cross-linking mode, how many moles of network chains are there per cubic centimeter? b) What stress is required to stretch the ... Read More

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Youngs Modulus and Shear Modulus for an Elastometer

Question Young’s modulus for an elastomer at 25°C is 3 x 107 dynes/cm2. What is its shear modulus? What is the retractive stress if a sample 1 cm x 1 cm x 10 cm is stretched to 25 cm length at 100°C? Summary This question belongs to physics and discusses about Young’s Modulus ... Read More

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Creep and Creep Recovery Curves for Three Element Model

Question Draw the creep and creep recovery curves for the three-element model consisting of a Kelvin element and a spring in series. Summary This question belongs to physics and discusses about creep and creep recovery curves. Word count: NA   ... Read More

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Viscosity of the Polymer when Molecular Weight is Doubled

Question A new polymer with a mer weight of 211 g/mol and five atoms in the chain was found to have a weight-average molecular weight of 300,000 g/mol. Its melt viscosity is 1500 poises. What is the viscosity of the polymer if its molecular weight is doubled? Summary This question belongs to phys ... Read More

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Melt Viscosity at 140 Degrees C and Zw is 900

Question A polymer with a Tg of 110°C and a Zw of 400 was found to have a melt viscosity of 5000 Pa.s at 160°C. What is its melt viscosity at 140°C when Zw = 900? [Hint: Combine the WLF equation with the DP dependence]. Summary This question belongs to physics and discusses about mel ... Read More

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Radial Wave Function of a Mass Moving in a Spherically Symmetric Potential

Question Summary This question belongs to physics and discusses about radial wave function of a mass moving in a spherically symmetric potential. Word count: NA   ... Read More

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Oceans  and its Physical Properties

Question The physical properties of water make it a very unusual substance and determine many of the properties of the oceans. Here are two simple experiments that can help us investigate how things dissolve in water and how water freezes. Experiment Materials: A glass (with a smooth even rim), ... Read More

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Properties of Oceans and Freezing Properties of Water

Question The physical properties of water make it a very unusual substance and determine many of the properties of the oceans. Here are two simple experiments that can help us investigate how things dissolve in water and how water freezes. Materials: 4 glasses (8 to 12 oz.), water, salt, food col ... Read More

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Integrated Circuits of Patterning Aluminum by Plasma Etching and Patterning of Copper by Damascene Plating

Question Very- large-scale integration (VLSI) of integrated circuits (ICs) is the combination of thousands of transistors on a single piece of silicon wafer. Metallic interconnects from one transistor to another on the silicon wafer make VLSI possible. Plasma etching is a process in which the plasm ... Read More

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Formation of Sputter-deposited Aluminum

Question Plated copper is more conductive than sputter-deposited aluminum which leads to less hat and smaller ICs but copper is more expensive than aluminum. If you could electroplate aluminum from a ionic liquid solution in a structure like figure 2, then can you have a better IC? Than with an IC ... Read More

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