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energy unit
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Gravity
Terms in this set (5)
Energy
the ability to cause changes in matter, exists in many different forms
Thermal energy
the energy associated with the motion of the particles of matter, heat is the transfer of thermal energy
Radiant energy
energy transferred through electromagnetic waves such as visible light, ultraviolet light, or x-rays
Solar Energy
A type of radiant energy from the sun that provides light and heat for Earth; solar energy can be used to generate electricity
Chemical energy
Energy stored in chemical bonds
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Verified questions
ENGINEERING
Pulverized coal pellets, which may be approximated as carbon spheres of radius $r_{o}=1 \mathrm{mm}$, are burned in a pure oxygen atmosphere at 1450 K and 1 atm. Oxygen is transferred to the particle surface by diffusion, where it is consumed in the reaction $\mathrm{C}+\mathrm{O}_{2} \rightarrow \mathrm{CO}_{2}$. The reaction rate is first order and of the form $N_{\mathrm{O}_{2}}^{\prime \prime}=-k_{1}^{\prime \prime} C_{0_{2}}\left(r_{o}\right)$, where $k_{1}^{\prime \prime}=0.1 \mathrm{m} / \mathrm{s}$. Neglecting changes in $r_{0}$, determine the steady-state $O_{2}$ molar consumption rate in kmol/s. At 1450 K, the binary diffusion coefficient for $O_{2}$ and $CO_{2}$ is $1.71 \times 10^{-4} \mathrm{m}^{2} / \mathrm{s}$.
ENGINEERING
Parseval’s theorem is only for nonperiodic functions. (a) True (b) False
ENGINEERING
How would you compare the enthalpy of water vapor at $20^{\circ} \mathrm{C}$ and 2 kPa with the enthalpy of water vapor at $20^{\circ} \mathrm{C}$ and 0.5 kPa?
ENGINEERING
The space heating of a facility is accomplished by natural gas heaters that are 85 percent efficient. The compressed-air needs of the facility are met by a large liquid-cooled compressor. The coolant of the compressor is cooled by air in a liquid-to-air heat exchanger whose airflow section is 1.0 m high and 1.0 m wide. During typical operation, the air is heated from 20 to 52$^\circ{}$C as it flows through the heat exchanger. The average velocity of air on the inlet side is measured at 3 m/s. The compressor operates 20 hours a day and 5 days a week throughout the year. Taking the heating season to be 6 months (26 weeks) and the cost of the natural gas to be $1.25/therm (1 therm = 105,500 kJ = 100,000 Btu), determine how much money will be saved by diverting the compressor waste heat into the facility during the heating session.
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