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Physics

Mechanics

Easy

Question

A 3 kg ball strikes a heavy rigid wall with a speed of 10 m/s at an angle of 60° with the wall. It gets reflected with the same speed at 60° with the wall. If the ball is in contact with the wall for 0.2 s, the average force exerted on the ball by the wall is

300 N
zero
$150 \sqrt{3} N$
150 N

The correct answer is: $150 square root of 3 straight N$

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A uniform solid sphere of mass m and radius R is kept on the rough horizontal surface with co-efficient of friction $mu$ = 1/3 as shown in figure. An impulse of $J equals m v subscript 0$ is applied tangentially on the sphere at an angle 37° with the horizontal as shown in the figure. (assuming J >> mgdt, g = 10 m/s2, $open tan invisible function application 37 to the power of ring operator equals 3 divided by 4 close parentheses$ )

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PhysicsMechanics

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$F i g u r e space s h o w space a space b l o c k space A space o f space m a s s space 9 space m space h a v i n g space a space s m o o t h space s e m i c i r c u l a r space g r o o v e space o f space r a d i u s R space p l a c e d space o n space a space s m o o t h space h o r i z o n t a l space s u r f a c e. space A space b l o c k space B space o f space m a s s space m space i s space r e l e a s e d space f r o m space a space p o s i t i o n space i n space g r o o v e space w h e r e space i t s space r a d i u s space i s space h o r i z o n t a l. space F i n d space t h e space s p e e d space o f space b i g g e r space b l o c k space w h e n space s m a l l e r space b l o c k space r e a c h e s space i t s space b o t t o m m o s t space p o s i t i o n.$

$F i g u r e space s h o w space a space b l o c k space A space o f space m a s s space 9 space m space h a v i n g space a space s m o o t h space s e m i c i r c u l a r space g r o o v e space o f space r a d i u s R space p l a c e d space o n space a space s m o o t h space h o r i z o n t a l space s u r f a c e. space A space b l o c k space B space o f space m a s s space m space i s space r e l e a s e d space f r o m space a space p o s i t i o n space i n space g r o o v e space w h e r e space i t s space r a d i u s space i s space h o r i z o n t a l. space F i n d space t h e space s p e e d space o f space b i g g e r space b l o c k space w h e n space s m a l l e r space b l o c k space r e a c h e s space i t s space b o t t o m m o s t space p o s i t i o n.$

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$A space s m a l l space b l o c k space o f space m a s s space m space i s space p r o j e c t e d space o n space a space l o n g space p l a n k space o f space m a s s space 3 space m space w i t h space v e l o c i t y v subscript 0 space a s space s h o w n space i n space f i g u r e. space F i n d space t h e space w o r k space d o n e space b y space f r i c t i o n space w h e n space s l i p p i n g space s t o p s.$

$A space s m a l l space b l o c k space o f space m a s s space m space i s space p r o j e c t e d space o n space a space l o n g space p l a n k space o f space m a s s space 3 space m space w i t h space v e l o c i t y v subscript 0 space a s space s h o w n space i n space f i g u r e. space F i n d space t h e space w o r k space d o n e space b y space f r i c t i o n space w h e n space s l i p p i n g space s t o p s.$

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$T w o space t r o l l e y s space A space a n d space B space a r e space f r e e space t o space m o v e space o n space a space l e v e l space f r i c t i o n l e s s space t r a c k comma space a n d space a r e space i n i t i a l l y space s t a t i o n a r y. space A space m a n space o n space t r o l l e y space A space t h r o w s space a space b a g space o f space m a s s space 10 space k g space w i t h space a space h o r i z o n t a l space v e l o c i t y space o f space 4 space m s to the power of negative 1 end exponent space w i t h space r e s p e c t space t o space h i m s e l f space o n space t o space t r o l l e y space B space o f space m a s s space 100 space k g. space T h e space c o m b i n e d space m a s s space o f space t r o l l e y space A space left parenthesis e x c l u d i n g space b a g right parenthesis space a n d space t h e space m a n space i s space 140 space k g. space F i n d space t h e space r a t i o space o f space v e l o c i t i e s space o f space t r o l l e y s space A space a n d B comma space j u s t space a f t e r space t h e space b a g space l a n d s space o n space t r o l l e y space B.$

$T w o space t r o l l e y s space A space a n d space B space a r e space f r e e space t o space m o v e space o n space a space l e v e l space f r i c t i o n l e s s space t r a c k comma space a n d space a r e space i n i t i a l l y space s t a t i o n a r y. space A space m a n space o n space t r o l l e y space A space t h r o w s space a space b a g space o f space m a s s space 10 space k g space w i t h space a space h o r i z o n t a l space v e l o c i t y space o f space 4 space m s to the power of negative 1 end exponent space w i t h space r e s p e c t space t o space h i m s e l f space o n space t o space t r o l l e y space B space o f space m a s s space 100 space k g. space T h e space c o m b i n e d space m a s s space o f space t r o l l e y space A space left parenthesis e x c l u d i n g space b a g right parenthesis space a n d space t h e space m a n space i s space 140 space k g. space F i n d space t h e space r a t i o space o f space v e l o c i t i e s space o f space t r o l l e y s space A space a n d B comma space j u s t space a f t e r space t h e space b a g space l a n d s space o n space t r o l l e y space B.$

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$A space m u d space b a l l space a t space r e s t space e x p l o d e s space i n t o space t h r e e space f r a g e m e n t s space o f space m a s s e s space i n space t h e space r a t i o space l colon 2 colon 1. space T h e space t w o space e q u a l space m a s s e s space m o v e space w i t h space v e l o c i t i e s space 2 space i with hat on top plus 5 space j with hat on top minus 6 space k with hat on top space a n d space space i with hat on top plus 3 space j with hat on top plus 2 space k with hat on top. F i n d space t h e space v e l o c i t y space o f space t h e space t h i r d space m a s s.$

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PhysicsMechanics

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$A space s h e l l space i s space f i r e d space f r o m space a space c a n n o n space w i t h space a space s p e e d space o f space 100 m divided by s space a t space a n space a n g l e space 30 to the power of 0 space w i t h space t h e space v e r t i c a l space left parenthesis y minus d i r e c t i o n right parenthesis. space A t space t h e space h i g h e s t space p o i n t space o f space i t s space t r a j e c t o r y comma space t h e space s h e l l space e x p l o d e s space i n t o space t w o space f r a g m e n t s space o f space m a s s e s space i n space t h e space r a t i o space 1 colon 2. space T h e space l i g h t e r f r a g e m e n t space m o v e s space v e r t i c a l l y space u p w a r d s space w i t h space a n space i n i t i a l space s p e e d space o f space 200 space m divided by s. space W h a t i s space t h e space s p e e d space o f space t h e space h e a v i e r space f r a g e m e n t space a t space t h e space t i m e space o f space e x p l o s i o n ?$

PhysicsMechanics

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