Physics

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$straight A space block space of space mass space straight m space rests space on space straight a space stationary space wedge space of space mass space straight M. space The space wedge space can space slide space freely space on space straight a space smooth space horizontal space surface space as space shown space in space figure. space If space the space block space starts space from space rest$

$the position of the centre of mass of the system will change$
$the position of the centre of mass of the system will change along the vertical but not along the horizontal$
$the total energy of the system will remain constant$
$All of the above$

The correct answer is: $All space of space the space above$

Ans: 4
Sol: Net horizontal force on system is zero, Therefore, centre of mass does not move in horizontal. Further, all surfaces are smooth. Therefore mechanical energy of the system remains constant.

$straight A space car space of space mass space 500 space kg space left parenthesis including space the space mass space of space straight a space block right parenthesis space is space moving space on space straight a space smooth space road space with space velocity space 1.0 space ms to the power of negative 1 end exponent space space along space positive space straight x space minus axis. space Now space straight a space block space of space mass space 25 space kg space is space thrown space outside space with space space absolute space velocity space of space space space 20 space ms to the power of negative 1 end exponent space along space positive space straight z space minus axis. space The space new space velocity space of space the space car space is space open parentheses m s to the power of negative 1 end exponent close parentheses$

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General

Physics

$From space the space circular space disc space of space radius space 4 straight R space two space small space discs space of space radius space straight R space are space cut space off. space The space centre space of space mass space of space the space new space structure space will space be space at$

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General

Physics

$The space net space force space acting space on space straight a space particle space moving space along space straight a space straight space line space varies space with space time space as space shown space in space the space diagram. space Force space is space parallel space to space velocity. space Which space of space the space following space graph space is space best space representative space of space speed space with space time ? space left parenthesis Initial space velocity space of space the space particle space is space zero right parenthesis$

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General

Physics

$straight A space man space of space mass space straight M space stands space at space one space end space of space straight a space stationary space plank space of space length space straight L comma space lying space on space straight a space smooth space surface. space The space man space walks space to space the space other space end space of space the space plank. space If space the space mass space of space the space plank space is space straight M divided by 3 comma space the space distance space that space the space man space moves space relative space to space the space ground space is$

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General

Physics

$straight A space ball space of space mass space straight m space moving space with space velocity space v subscript 0 italic space space collides space straight a space wall space as space shown space in space figure. space After space impact space it space rebounds space with space straight a space velocity space 3 over 4 straight nu subscript 0 space T h e italic space i m p u l s e italic space a c t i n g italic space o n italic space b a l l italic space d u r i n g italic space i m p a c t italic space i s$

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General

Physics

$straight A space particle space of space mass space straight m space moving space with space velocity space straight u space makes space an space elastic space one minus dimensional space collision space with space straight a space stationary space particle space of space mass space straight m. space They space come space in space contact space for space straight a space very space small space time space t subscript 0 space. space Their space force space of space interaction space increases space from space zero space to space F subscript 0 italic space space space linearly space in space time space 0.5 t subscript 0 space comma space and space decreases space linearly space to space zero space in space further space time space space 0.5 t subscript 0 italic space a s italic space s h o w n italic space i n italic space f i g u r e italic. italic space T h e italic space m a g n i t u d e italic space o f italic space F subscript italic 0 text is end text$

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General

Physics

$straight A space bullet space of space mass space straight m space hits space straight a space target space of space mass space straight M space hanging space by space straight a space string space and space gets space embedded space in space it. space If space the space block space rises space to space straight a space height space straight h space as space straight a space result space of space this space collision comma space the space velocity space of space the space bullet space before space collision space is$

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General

Physics

$Two space identical space blocks space straight A space and space straight B space of space mass space straight m space joined space together space with space straight a space massless space spring space as space shown space in space figure space are space placed space on space straight a space smooth space surface. space If space the space block space straight A space moves space with space an space acceleration space a subscript 0 space comma space then space theacceleration space of space the space block space straight B space is$

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General

Physics

$straight A space ball space of space mass space straight m space moving space at space straight a space speed space straight v space collides space with space another space ball space of space mass space 3 space straight m space at space rest. space The space lighter space block space comes space to space rest space after space collision. space The space coefficient space of space restitution space is$

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General

Physics

$none space of space the space space straight A space steel space ball space is space dropped space on space straight a space hard space surface space from space straight a space height space of space 1 space straight m space and space rebounds space to space straight a space height space of space 64 space cm. space The space maximum space height space attained space by space the space ball space after space space n to the power of t h end exponent text bounce is (in end text open straight m close parentheses$

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General

Physics

$straight A space boat space of space length space 10 space straight m space and space mass space 450 kg space is space floating space without space motion space in space still space water. space straight A space man space of space mass space 50 kg space standing space at space one space end space of space it space walks space to space the space other space end space of space it space and space stops. The space magnitude space of space thedisplacement space of space the space boat space in space metres space relative space to space ground space is$

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General

Physics

$straight A space machine space gun space shoots space straight a space 40 straight g space bullet space at space straight a space speed space of space 1200 space ms to the power of negative 1 end exponent space space. space The space man space operating space the space gun space can space bear space straight a space maximum space force space of space 144 straight N. space The space maximum space number space of space bullets space shot space per space second space is$

PhysicsGeneral

General

Physics

$straight A space ball space after space freely space falling space from space straight a space height space of space 4.9 space straight m space strikes space straight a space horizontal space plane. space If space the space coefficient space of space restitution space is space 3 divided by 4 comma space the space ball space will space strike space second space time space with space the space plane space after$

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General

Physics

$straight A space heavy space ball space moving space with space speed space straight v space collides space with space straight a space tiny space ball. space The space collision space is space elastic comma space then space immediately space after space the space impact comma space the space second space ball space will space move space with space straight a space speed space approximately space equal space to$

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General

Physics

$straight A space projectile space of space mass space straight m space is space fired space with space straight a space velocity space straight v space from space point space Pat space an space angle space 45 degree space. space Neglecting space air space resistance comma space the space magnitude space of space the space change space in space momentum space leaving space the space point space straight P space and space arriving space at space straight Q space is$

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$the position of the centre of mass of the system will change$
$the position of the centre of mass of the system will change along the vertical but not along the horizontal$
$the total energy of the system will remain constant$
$All of the above$

The correct answer is: $All space of space the space above$

Ans: 4
Sol: Net horizontal force on system is zero, Therefore, centre of mass does not move in horizontal. Further, all surfaces are smooth. Therefore mechanical energy of the system remains constant.

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The correct answer is:

Ans: 4Sol: Net horizontal force on system is zero, Therefore, centre of mass does not move in horizontal. Further, all surfaces are smooth. Therefore mechanical energy of the system remains constant.

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The correct answer is: $All space of space the space above$

Ans: 4
Sol: Net horizontal force on system is zero, Therefore, centre of mass does not move in horizontal. Further, all surfaces are smooth. Therefore mechanical energy of the system remains constant.