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You have a fuel cell that can produce a maximum of 3.5 kW of electrical power. The device has a mass of 115 lbm. (a) Determine the weight of the fuel cell in English and SI units. Strategy This problem requires the use of unit conversions and the factor g. to determine weight in Ibr and N. Solution Using the equation W = mg and that g = 9.8066 m/s² = 32.174 fus?. %3D 115lb 32.174n In English units, we have: W 1lb, Ib - ft/s lb, In SI units, we have: 1 kg Ib 115 lb. IN m kg - m/s (b) Determine the "specific power" of the fuel cell in units of W/kg and compare with an internal combustion engine with a specific power of 550 W/kg. Strategy This problem requires the use of unit conversions. Solution Start with the required ratio and convert units as needed. 3.5kW Ib 115 lb. kW kg kg This value is about _x less than in the internal combustion engine.

You have a fuel cell that can produce a maximum of 3.5 kW of electrical power. The device has a mass of 115 lbm. (a) Determine the weight of the fuel cell in English and SI units. Strategy This problem requires the use of unit conversions and the factor g. to determine weight in Ibr and N. Solution Using the equation W = mg and that g = 9.8066 m/s² = 32.174 fus?. %3D 115lb 32.174n In English units, we have: W 1lb, Ib - ft/s lb, In SI units, we have: 1 kg Ib 115 lb. IN m kg - m/s (b) Determine the "specific power" of the fuel cell in units of W/kg and compare with an internal combustion engine with a specific power of 550 W/kg. Strategy This problem requires the use of unit conversions. Solution Start with the required ratio and convert units as needed. 3.5kW Ib 115 lb. kW kg kg This value is about _x less than in the internal combustion engine.

Introduction to Chemical Engineering Thermodynamics
Introduction to Chemical Engineering Thermodynamics
8th Edition
ISBN:9781259696527
Author:J.M. Smith Termodinamica en ingenieria quimica, Hendrick C Van Ness, Michael Abbott, Mark Swihart
Publisher:J.M. Smith Termodinamica en ingenieria quimica, Hendrick C Van Ness, Michael Abbott, Mark Swihart
Chapter1: Introduction
Section: Chapter Questions
Problem 1.1P
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Answer the blank in a and b. show solutions. this is chemical engineering calculations.

You have a fuel cell that can produce a maximum of 3.5 kW of electrical power. The device has a mass of 115 lbm. (a) Determine the weight of the fuel cell in English and SI units. Strategy This problem requires the use of unit conversions and the factor g. to determine weight in Ibr and N. Solution Using the equation W = mg and that g = 9.8066 m/s? = 32.174 f/s?. %3D 115lb 32.174 N In English units, we have: W 1lb, Ib - ft/s? lb In SI units, we have: 115 lb. 1 kg IN m W = Ib. kg - m/s (b) Determine the "specific power" of the fuel cell in units of W/kg and compare with an internal combustion engine with a specific power of 550 W/kg. Strategy This problem requires the use of unit conversions. Solution Start with the required ratio and convert units as needed. 3.5kW Ib_ 115 lb kW kg kg This value is about _x less than in the internal combustion engine.
Transcribed Image Text:You have a fuel cell that can produce a maximum of 3.5 kW of electrical power. The device has a mass of 115 lbm. (a) Determine the weight of the fuel cell in English and SI units. Strategy This problem requires the use of unit conversions and the factor g. to determine weight in Ibr and N. Solution Using the equation W = mg and that g = 9.8066 m/s? = 32.174 f/s?. %3D 115lb 32.174 N In English units, we have: W 1lb, Ib - ft/s? lb In SI units, we have: 115 lb. 1 kg IN m W = Ib. kg - m/s (b) Determine the "specific power" of the fuel cell in units of W/kg and compare with an internal combustion engine with a specific power of 550 W/kg. Strategy This problem requires the use of unit conversions. Solution Start with the required ratio and convert units as needed. 3.5kW Ib_ 115 lb kW kg kg This value is about _x less than in the internal combustion engine.
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