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ruben lozano

ruben l.

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Determine the number of valence electrons for selenium, Se. 34 7 5 6

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The four steps that economists use to study how the economy works are observing events, formulating a hypothesis, building a model, and testing the model with data. True False

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During walking at the speed of 1 m/sec person A needs 30mlO * 2 / k * gmin person B needs 25 1O2/kg bullet kgmin, and person C needs 35 O * 2 / k * gmin Which of the following is true?

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According to your text, evaluative conditioning is similar to Group of answer choices observational learning. operant conditioning. classical conditioning. the mere exposure effect.

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Building code has little influence on the interior finishes of a building. True False

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Jenna is an environmentalist. Which type of intelligence would most accurately describe Jenna's abilities?

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Please complete the following questions/items using the Power Point for Chapter 6. 1. Approximately ____ % of adults in the U.S. have at least one type of anxiety disorder in any given year, and about ____ % of people with an anxiety disorder also have another anxiety disorder or a mood disorder. 2. A phobia is a persistent, ____ fear of an object or situation that leads to ____ behaviors. 3. Obsessions are repetitive, ____ thoughts or impulses that cause anxiety, and compulsions are repetitive behaviors or ____ used to reduce that anxiety. 4. To be diagnosed with panic disorder, the person must have at least one panic attack that involves ____ or more symptoms that develop quickly and reach a peak with ____ minutes, and if the person develops a fear of situations/places he/she cannot escape and then avoids those places he or she might be diagnosed with panic disorder with

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if you wish to have \$30,000 every year for the next 5 years, how much should you put into the saving account now? consider 3\% compound interest rate

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QUESTION 4 (20 MARKS) a) What are the limitations of the classical Dulong Petit law for explaining the specific heat of solids? What are the assumptions made by Einstein to explain the experimentally observed specific heat of solids? What are the most significant assumptions made by Debye as opposed to Einstein to interpret the specific heat of solids? (4 marks) 3 SSCP 4423 b) Explain in detail how the concept of normal modes and Debye cutoff frequency for the phonons are used to derive the formula for Debye's T³ law for the molar heat capacity of solids. (4 marks) c) What conclusion can be drawn by comparing the Debye and Einstein model to explain the low temperature (T) behavior of lattice heat capacity ($C_v$) in solid (use a plot of $C_v$ ~ T)? Why Einstein theory could not explain the experimentally observed low temperature specific heat of solids? (4 marks) d) What are the main differences between the Drude-Lorentz formula and Wiedemann- Frantz law? What is the information of solids one obtains from the Lorenz number? Why does the Drude theory fails to explain the experimentally observed thermal and electrical properties of solids? (3 marks) e) Estimate the value of Lorenz number for copper at room temperature of 300 K. The density of electrons in copper is 8.5 \cdot 10^{28} m^{-3} and mean free path length is 0.26 nm.

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45 40 35 30- 25 20- 15 10- 5 Prios Supply Demand 20 40 60 80 100 120 140 160 Quantity The graph illustrates the domestic supply and domestic demand in the coffee market in Brazil. Without Trade 1. Brazil is not trading internationally and is currently at equilibrium. a. Calculate Consumer Surplus. b. Calculate Producer Surplus. c. Calculate Total Surplus. Under Free Trade 1) The world price of coffee is $5. Draw the world price on the graph. a. If Brazil is open to international trade will they import or export coffee? How much? b. Calculate Consumer Surplus c. Calculate Producer Surplus d. Calculate Total Surplus e. What are the gains from trade?

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