Physics

Heat

Easy

Question

At which of the following temperature would the molecules of a gas have twice the average kinetic energy they have at 20°C

40°C
80°C
313°C
586°C

The correct answer is: 313°C

$E equals 3 over 2 k subscript B T not stretchy rightwards double arrow E proportional to T$

Gas at a pressure P₀ is contained in a vessel. If the masses of all the molecules are halved and their speeds are doubled, the resulting pressure P will be equal to

PhysicsHeat

Heat

Physics

$Five space identical space rods space are space joined space as space shown space in space figure. space Point space straight A space and space straight C space are space maintained space at space space temperature space 120 degree straight C space and space 20 degree straight C space respectively. space The space temperature space of space junction space straight B space will space be space$

PhysicsHeat

Heat

Physics

$There space are space two space spherical space balls space straight A space and space straight B space of space the space same space material space with space same space surface comma space but space the space space diameter space of space straight A space is space half space that space of space straight B. space If space straight A space and space straight B space are space heated space to space the space same space temperature space and space space then space allowed space to space cool comma space then$

PhysicsHeat

Heat

Physics

$The space wavelength space of space maximum space intensity space of space radiation space emitted space by space straight a space star space is space 289.8 space nm. space The space space radiation space intensity space for space the space star space is space colon space left parenthesis Stefan ’ straight s space constant space 5.67 cross times 10 to the power of negative 8 end exponent Wm to the power of negative 2 end exponent straight K to the power of negative 4 end exponent space comma space constant space straight b equals space 2898 space straight mu mK right parenthesis$

PhysicsHeat

Heat

Physics

$If space at space temperature space straight T subscript 1 equals 1000 straight K space space the space wavelength space is space 1.4 cross times 10 to the power of negative 6 end exponent straight m comma space space then space at space what space temperature space the space space wavelength space will space be space 2.8 cross times 10 to the power of negative 6 end exponent straight m space space space$

PhysicsHeat

Heat

Physics

$Wein apostrophe straight s space constant space is space 2892 cross times 10 to the power of negative 6 end exponent space space MKS space unit space and space the space value space of space straight lambda subscript straight m space space from space moon space is space 14.46 space microns. space What space is space the space surface space temperature space of space moon$

PhysicsHeat

Heat

Physics

$The space two space opposite space faces space of space straight a space cubical space piece space of space iron space left parenthesis thermal space conductivity space equals space 0.2 space CGS space units right parenthesis are space at space 100 to the power of degree straight C space space and space 0 to the power of degree straight C space in space ice. space If space the space area space of space straight a space surfaces space is space 4 cm squared space comma space then space the space mass space of space ice melted space in space 10 space minutes space will space be$

PhysicsHeat

Heat

Physics

$Four space rods space of space silver comma space copper comma space brass space and space wood space are space of space same space shape. space They space are space heated space together space after space wrapping space straight a space paper space on space it comma space the space paper space will space burn space first space on$

PhysicsHeat

Heat

Physics

$In space straight a space steady space state space of space thermal space conduction comma space temperature space of space the space ends space straight A space and space straight B space of space straight a space 20 space cm space space long space rod space are space 100 to the power of degree straight C space space and space 0 to the power of degree straight C space space respectively. space What space will space be space the space temperature space of space the space rod space at space straight a space space point space at space straight a space distance space of space 6 space cm space from space the space end space straight A space of space the space rod$

PhysicsHeat

Heat

Physics

$Two space vessels space of space different space materials space are space similar space in space size space in space every space respect. space The space same space space quantity space of space ice space filled space in space them space gets space melted space in space 20 space minutes space and space 40 space minutes space respectively. space space The space ratio space of space thermal space conductivities space of space the space materials space is$

PhysicsHeat

Heat

Physics

$straight A space rod space of space 40 space cm space in space length space and space temperature space difference space of space space 80 to the power of degree space straight C space at space its space two space ends. space Another space space rod space straight B space of space length space 60 space cm space and space of space temperature space difference space 90 to the power of degree space straight C space comma space having space the space same space area space of space space cross minus section. space If space the space rate space of space flow space of space heat space is space the space same comma space then space the space ratio space of space their space thermal space space conductivities space will space be$

PhysicsHeat

Heat

Physics

$End space straight A space space of space straight a space rod space AB space is space being space pulled space on space the space floor space with space straight a space constant space velocity space v subscript 0 italic space space space as space shown. space Taking space the space length space of space space the space rod space as italic space l space comma space at space an space instant space when space the space rod space makes space an space angle space 37 degree space space with space the space horizontal comma space calculate space$

$The space velocity space of space end space straight B$

PhysicsHeat

Heat

Physics

$The space horizontal space beam space in space figure space weighs space 150 straight N comma space and space its space centre space of space gravity space is space at space its space centre. space Find space$

$The space horizontal space and space vertical space components space of space the space force space exerted space on space the space beam space at space the space wall space$

PhysicsHeat

Heat

Physics

$The space horizontal space beam space in space figure space weighs space 150 straight N comma space and space its space centre space of space gravity space is space at space its space centre. space Find space$

$The space tension space in space the space cable space$

PhysicsHeat

Heat

Physics

$Coefficient space of space real space expansion space of space mercury space is space 0.18 cross times 10 to the power of negative 3 end exponent divided by straight C presuperscript ring operator space space If space the space density space of space mercury space at space 0 degree straight C space is space 13.6 space gm divided by cc. space its space density space at space 473 straight K space is$

PhysicsHeat

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Can’t find what you’re looking for?

At which of the following temperature would the molecules of a gas have twice the average kinetic energy they have at 20°C

40°C
80°C
313°C
586°C

The correct answer is: 313°C

$E equals 3 over 2 k subscript B T not stretchy rightwards double arrow E proportional to T$

Related Questions to study

Gas at a pressure P₀ is contained in a vessel. If the masses of all the molecules are halved and their speeds are doubled, the resulting pressure P will be equal to

Gas at a pressure P₀ is contained in a vessel. If the masses of all the molecules are halved and their speeds are doubled, the resulting pressure P will be equal to

$The space horizontal space beam space in space figure space weighs space 150 straight N comma space and space its space centre space of space gravity space is space at space its space centre. space Find space$

$The space tension space in space the space cable space$

$The space horizontal space beam space in space figure space weighs space 150 straight N comma space and space its space centre space of space gravity space is space at space its space centre. space Find space$

$The space tension space in space the space cable space$

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Can’t find what you’re looking for?

At which of the following temperature would the molecules of a gas have twice the average kinetic energy they have at 20°C

40°C80°C313°C586°C

The correct answer is: 313°C

Related Questions to study

Gas at a pressure P0 is contained in a vessel. If the masses of all the molecules are halved and their speeds are doubled, the resulting pressure P will be equal to

Gas at a pressure P0 is contained in a vessel. If the masses of all the molecules are halved and their speeds are doubled, the resulting pressure P will be equal to

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40°C
80°C
313°C
586°C

Gas at a pressure P₀ is contained in a vessel. If the masses of all the molecules are halved and their speeds are doubled, the resulting pressure P will be equal to

Gas at a pressure P₀ is contained in a vessel. If the masses of all the molecules are halved and their speeds are doubled, the resulting pressure P will be equal to