Engineering, 18.07.2019 01:30 yeeyee69

Compare the flow rates into a hood that needs to capture a contaminant at 12 inches vs 24 inches. assume that the minimum capture velocity of 200 ft/min and an 8-inch round hood opening

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Answer from: Quest

Idon’t know but you can ask someone i know irish

Answer from: Quest

answer: excel provides a method to add or to remove borders around and between cells. instead of selecting cells first and then formatting, you can choose the formatting tool that you want to use, and then apply the format to one or more cells.

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Answer from: Quest

Infrared sensor is most used sensor in wireless technology where remote controlling functions and detection of surrounding objects/ obstacles are involved. this post will discuss about what is infrared sensor, its working principle, how it works, types, applications, advantages and disadvantages. what is infrared sensor

ir sensor is a simple electronic device which emits and detects ir radiation in order to find out certain objects/obstacles in its range. some of its features are heat and motion sensing.

ir sensors use infrared radiation of wavelength between 0.75 to 1000µm which falls between visible and microwave regions of electromagnetic spectrum. ir region is not visible to human eyes. infrared spectrum is categorized into three regions based on its wavelength i.e. near infrared, mid infrared, far infrared.

wavelength regions of infrared spectrum

near ir – 0.75µm to 3 µm
mid ir – 3 µm to 6 µm
far ir – > 6 µm
1 introduction to infrared sensor

fig. 1 – introduction to infrared sensor

working principle of infrared sensor

infrared sensors works on three fundamental physics laws:

planck’s radiation law: any object whose temperature is not equal to absolute zero (0 kelvin) emits radiation.
stephan boltzmann law: the total energy emitted at all wavelengths by a black body is related to the absolute temperature.
wein’s displacement law: objects of different temperature emit spectra that peak at different wavelengths that is inversely proportional to temperature.
key elements of infrared detection system

the key elements of infrared detection system are:

ir transmitter

ir transmitter acts as source for ir radiation. according to plank’s radiation law, every object is a source of ir radiation at temp t above 0 kelvin. in most cases black body radiators, tungsten lamps, silicon carbide, infrared lasers, leds of infrared wavelength are used as sources.

transmission medium

as the name suggests, transmission medium provides passage for the radiation to reach from ir transmitter to ir receiver. vacuum, atmosphere and optical fibers are used as medium.

ir receiver

generally ir receivers are photo diode and photo transistors. they are capable of detecting infrared radiation. hence ir receiver is also called as ir detector. variety of receivers are available based on wavelength, voltage and package.

ir transmitter and receivers are selected with matching parameters. some of deciding specifications of receivers are photosensitivity or responsivity, noise equivalent power and detectivity.

Answer from: Quest

nitially, the gas is at pressure p_0 ... The diagram shows several possible processes of expansion. ... unusual: They represent the relative change in pressure and in volume. Which of the curves in the figure represents an isothermal process? ... The ideal gas law states that pV = nRT . ... to the final volume R_{\rm v}V_0 .

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The p V-diagram above represents the states of an ideal gas during one cycle of ... During process A B, the volume of the gas increases from V. to 2V, and the gas ... of thermodynamics, determine the work performed by or on the gas during the ... Four samples of ideal gas are each initially at a pressure P. and volume V., ...

What are PV diagrams? (article) | Khan Academywww.khanacademy.org › ... › Laws of thermodynamics

A convenient way to visualize these changes in the pressure and volume is by using a ... As a gas goes through a thermodynamics process, the state of the gas will shift ... How do we determine the sign of the work done from a PV diagram? ... The work done during a thermodynamic process is equal to the area under the ...

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by A Refrigerators

irreversible process that takes a system from an initial state i to a final state f is exactly equal to the entropy change S for any reversible ... volume Vf, the change S in the entropy of the gas is. (20-4). The Second Law of Thermodynamics This law, which is ... ergy extracted as heat from the low-temperature reservoir is con-.

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Disha Experts - 2019

A diatomic gas initially at 18oC is compressed adiabatically to one eighth of its original ... 2k mol of hydrogen at NTP expands isobarically to twice its initial volume. ... 109MJ (d) 1.09 MJ When a system is taken from state i to state falong the path iaf, ... What will be the final pressure if an ideal gas in a cylinder is compressed ...

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adiabatic, constant volume, and constant pressure). Use the heat ... Point i in the figure below represents the initial state of an ideal gas at tempemture T. Taking.

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At state 1, the gas has volume 1.50 × 10–3 m3, pressure 1.02 × 105 Pa, and the ... The metal block is removed and the gas expands to state 4 still at 100° C. ... page 3. (c) Indicate below whether the process from state 2 to state 3 is isothermal, ... An ideal gas initially has pressure p0, volume V0, and absolute temperature T0.

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work is done on it and its temperature increases; in an adiabatic expansion, the ... where the compressions of the gas-air mixture take place so quickly that there is ... A quasi-static, adiabatic expansion of an ideal gas is represented in (Figure), ... ideal gas makes a quasi-static adiabatic transition from a state with pressure ...

AP B Problems-Thermodynamics - School District of Claytonwww.claytonschools.net › lib › Centricity › Domain

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In terms of p0 and V0 calculate the work done by the gas in the process. b. In terms of p0 and V0 ... Four samples of ideal gas are each initially at a pressure Po and volume Vo, and a temperature To as shown on the diagram above. The samples are taken in separate experiment from this initial state to the final states I, II, III, ...

Qualification Exam: Statistical Mechanicspeople.physics.tamu.edu › abanov

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An adiabatic expansion from pressure P0, volume V0 to a volume 2V0; ... and F (Helmholtz free energy) for a homogeneous system in term of U (internal energy) and the ... Find the net work done in the process in terms of P0, V0. 2. ... The van der Waals equation of state for a mole of gas is given by (P +a/V 2)(V −b) =.

Searches related to An ideal gas is taken from initial state i at pressure P0 and volume V0 to final state f at pressure 2P0 and volume 2V0. The figures below represent four possible processes by which the gas can be taken from state i to state f. For which process is the work done by the gas greatest?

work done by gas changing pressure and volume

pv diagrams

what is the work w done by the gas as it expands isothermally from v0 to fvv0?

pv diagram problems and solutions

adiabatic

isobaric

what type of process does curve oa represent?

pressure vs volume graph

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