# Physics

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Solution Library **

#### Calculation of Thermal Diffusivity and Biot Number of a Process

Question A process for preserving peas involves heating them quickly to a high temperature by immersion in boiling water. In a particular case, peas with an average diameter of 10.0 mm are to be heated to an average temperature of 950 C by rapid immersion in boiling water at 1000 C. the initial tem ... Read More

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#### Calculation of Heat Transfer Rate and Enthalpies of Liquids

Question A double- effect evaporator is to be designed to concentrate a 5.0% (mass) NaOH solution to 30%. Steam is available at 3300F, 77.3 psia and the condensing temperature of the vapor from the lowest pressure effect is 1800 F. an initial guess for the T of the first effect results in the value ... Read More

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#### Determination of Minimum Gas Flow Rate

Question A packed tower is to be designed to remove ammonia from an aqueous liquid stream by stripping with air. The entering liquid has an NH3 mole fraction of 0.0425 and a flow rate of 0.4 kmol/min; the gas is pure air, 80% of the ammonia is to be removed from the liquid. The figure below shows t ... Read More

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#### Total Apparent Power Burden on the Current Transformer

Question If a watthour meter draws 1.5 W and 11.3 vars from a potential transformer, and 1.2 W and 1.8 vars from a current transformer, the total apparent power burden on the current transformer is Summary: This question belongs to electrostatics in physics and discusses about total apparent power ... Read More

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#### Calculation of the Ratio Correction Factor

Question If a 0.6 accuracy class current transformer has phase angle beta of +10 at 100% rated current, the ratio correction factor is Summary: This question belongs to electrostatics in physics and discusses about class current transformer and to determine the ratio correction factor. Total word ... Read More

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#### Calculation of RCF Value of a Transformer

Question If a 1.2 accuracy class current transformer used at a lagging phase angle gamma of 10, the RCF value is Summary: This question belongs to electrostatics in physics and discusses about class current transformer that has a lagging phase angle gamma and to determine the RCF value. Total wor ... Read More

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#### 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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