In moving out of a dormitory at the end of the semester, a student does 2.12 x 104 Jof work. In the process, his internal energydecreases by 4.01x 104 J. Determine each of the following quantities (including the algebraic sign): (a)W, (b)AU, and (c)Q.(a) NumberUnitsUnits(b) NumberUnits(c) Number

according to 2md law of thermodynamics Q = W + U Q = heat given to the system W = work done b…

Answered: In moving out of a dormitory at the end…

College Physics

11th Edition

ISBN:9781305952300

Author:Raymond A. Serway, Chris Vuille

Publisher:Raymond A. Serway, Chris Vuille

Chapter1: Units, Trigonometry. And Vectors

Section: Chapter Questions

Problem 1CQ: Estimate the order of magnitude of the length, in meters, of each of the following; (a) a mouse, (b)...

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A certain coal-fired power plant has a rated power capacity of P = 850 MW. The output of this plant is W = 0.26QH, where QH is the energy input as heat from the hot reservoir. a. If the power plant operates for a full day at its rated capacity, how much energy QH in MJ is needed? b. If, on average, one ton of coal contains Q = 25 GJ of energy, how many tons nH of coal would the plant need to operate for a day at its rated capacity? c. How many tons nC of this coal is exhausted as wasted heat to QC in a single day?
A furnace supplies 36.0 kW of thermal power at 230 °C to an engine that exhausts waste energy at 20.0°C. At the very best, how much work W can the system do per second? W = J
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Problem 1: Which of the following would violate the Second Law of Thermodynamics? Choose one that applies. OA 130 °F cup of hot coffee is placed on the table in a 75 °F room. Without any work being exerted and with no chemical reactions the cup of coffee heats up. O1,000 kJ of energy are available from a hot thermal reservoir. A heat engine converts 600 kJ to work and rejects 500 kJ to a lower temperature reservoir. A swinging pendulum gets lower and lower as friction takes energy out of the system. As a block slides down a rough incline heat is generated from friction. O Work is done and heat is made to go from a lower temperature reservoir to a higher temperature reservoir. O An inventor builds a device that is able to convert a specific amount of heat entirely to work in a thermodynamic cycle.
In a game of football outdoors on a cold day, a player will begin to feel exhausted after using approximately 8.0 x 10 J of internal energy. (a) One player, dressed too lightly for the weather, has to leave the game after losing 7.0 x 10° Jof heat. How much work has he done? (b) Another player, wearing clothes that offer better protection against heat loss, is able to remain in the game long enough to do 2.3x 105 J of work. What is the magnitude of the heat that he has lost? (a) Number Units (b) Number Units <.
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If the gravitational potential energy of the water is equal to the increase in the internal energy of the water, compute the change in its temperature (in Kelvin), if water drops from a height of 50 m. Assume no work is done on/by the water (C = 4184 J/kg K) Sol. Using the first law of thermodynamics: Delta U= Q - ______ Since W = _____ Then Delta U =Q But, by virtue of the problem, the internal energy is equal to Delta U= ___________ g _________ While Q = _______ delta T Then ______h= ________ delta T Delta T=___________ / ____________= _______________K (2 decimal place)
20. Six grams of helium (molecular mass 5 4.0 u) expand isothermally at 370 K and does 9600 J of work. Assuming that helium is anideal gas, determine the ratio of the fi nal volume of the gas to the initialvolume
Over the course of a day, 4.0 kg of water evaporates from the leaves of a corn plant. a) How much energy is required to evaporate the water? (Assume that the temperature of the leaves is 30C.) b) If the plant is active for 12 hours, how much power does this correspond to? You can think of this as the necessary power to drive transport in the plant.
5. (a) How much heat transfer occurs to the environment by an electrical power station that uses1.25 × 10^14 J of heat transfer into the engine with an efficiency of 42.0%? (b) What is the ratioof heat transfer to the environment to work output? (c) How much work is done?

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