Suppose a woman does 600 J of work and -9400 J of heat transfer occurs into the environment in the process. (a) What is the decrease in her internal energy, assuming no change in temperature or consumption of food? (That is, there is no other energy transfer.) AE int -10000 J (b) The internal energy is stored energy due to food intake. Treating the change in internal energy as the input energy and work done as output, what is her efficiency? % Efficiency, Eff:

Suppose a woman does 600 J of work and -9400 J of heat transfer occurs into the environment in the process. (a) What is the decrease in her internal energy, assuming no change in temperature or consumption of food? (That is, there is no other energy transfer.) AE int -10000 J (b) The internal energy is stored energy due to food intake. Treating the change in internal energy as the input energy and work done as output, what is her efficiency? % Efficiency, Eff:

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)...

See similar textbooks

Similar questions

A large electrical power station generates 1050 MW of electricity with an efficiency of 37.0%. (a) Calculate the heat transfer (in J) to the power station, Q, in one day. (b) How much heat transfer Q. (in J) occurs to the environment in one day? (c) If the heat transfer in the cooling towers is from 35.0°C water into the local air mass, which increases in temperature from 18.0°C to 20.0°C, what is the total increase in entropy (in J/K) due to this heat transfer? J/K (d) How much energy (in J) becomes unavailable to do work because of this increase in entropy, assuming an 18.0°C lowest temperature? (Part of Q. could be utilized to operate heat engines or for simple space heating, but it rarely is.) to Additional Materials O Reading CS Scanned with CamScanner
Suppose that a heat engine takes 3.20 104 J of heat from the high-temperature reservoir to produce 1.90 104 J of mechanical work. (a) What is the efficiency of this engine? (b) How much waste heat does it produce?
A refrigerator does 26.0 k) of work while moving 117 kJ of thermal energy from inside the refrigerator. (a) Calculate the refrigerator's coefficient of performance. (b) Calculate the energy it transfers to its environment. kJ
1. Suppose a woman does 600 J of work and -9500 J of heat transfer occurs into the environment in the process. (a) What is the decrease in her internal energy, assuming no change in temperature or consumption of food? (That is, there is no other energy transfer.) J AE int (b) The internal energy is stored energy due to food intake. Treating the change in internal energy as the input energy and work done as output, what is her efficiency? Efficiency, Eff: % (c) What physics law did you use in this problem? Zeroth Law of Thermodynamics First Law of Thermodynamics Second Law of Thermodynamics
What is the change in internal energy () of a system when it does 27 J of work while absorbing 34 J of heat?
An experimental power plant at the Natural EnergyLaboratory of Hawaii generates electricity from the temperature gradientof the ocean. The surface and deep-water temperatures are 27C and6C, respectively. (a) What is the maximum theoretical efficiency of thispower plant? (b) If the power plant is to produce 210 kW of power, atwhat rate must heat be extracted from the warm water? At what ratemust heat be absorbed by the cold water? Assume the maximum theoreticalefficiency. (c) The cold water that enters the plant leaves it at atemperature of 10C. What must be the flow rate of cold water throughthe system? Give your answer in kg/h and in L/h.
(a) What is the best coefficient of performance for a refrigerator that cools an environment at -28 C and has heat transfer to another environment at 49 ° C? COP, = 3.18 ref (b) How much work must be done for a heat transfer of 4186 kJ from the cold environment? W = 1316.4 kJ (c) What is the cost of doing this if the work costs 10.0 cents per 3.6x10° J (a kilowatt-hour)? Cost in cents = 3.66 (d) How many kJ of heat transfer, Q, occurs into the warm environment? Qn = 1314.5
A haeat engine uses a heat source at 580 degrees C and has an ideal (Carnot) efficieng=cy of 22%. To increase athe ideal efficiency to 42 %, what must be the temperature of the heat source?
Suppose a woman does 650 J of work and 9250 J of heat is transferred from her into the environment in the process. What is the change in her internal energy, in joules, assuming she does not consume any food? AU= What is her percent efficiency? n (%) = ||
The input power to operate a boiler comes from an electrical circuit with a voltage of 110 volts [ V ] and a resistance of 3 ohms [ Ω ]. The boiler produces 70 kilojoules of heat per minute [ k J m i n ] . What is the efficiency of the boiler, expressed as a percentage [ % ] ?