physics

mechanics

Easy

Question

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

$\hat{2 i} - 3 \hat{j} + 2 \hat{k}$
$\hat{i} + 4 \hat{j} + 2 \hat{k}$
$\hat{i} - 4 \hat{j} + 2 \hat{k}$
$\hat{i} - 4 \hat{j} - 2 \hat{k}$

The correct answer is: $\hat{i} - 4 \hat{j} + 2 \hat{k}$

$text Apply conservation of momentum: end text rightwards double arrow m subscript 1 v with rightwards arrow on top subscript 1 plus m subscript 2 v with rightwards arrow on top subscript 2 plus m subscript 3 v with rightwards arrow on top subscript 3 equals 0 m left parenthesis 2 i with hat on top plus 5 j with hat on top minus 6 k with hat on top right parenthesis plus 2 m v with rightwards arrow on top subscript 2 plus m left parenthesis negative 4 i with hat on top plus 3 j with hat on top plus 2 k with hat on top right parenthesis equals 0 v with rightwards arrow on top subscript 2 equals i with hat on top minus 4 j with hat on top plus 2 k with hat on top$

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

PhysicsMechanics

Mechanics

Physics

$A space b l o c k space o f space m a s s space m space i s space i n i t i a l l y space l y i n g space o n space a space w e d g e space o f space m a s space M space w i t h space a n space a n g l e space o f space i n c l i n a t i o n space theta comma space a s space s h o w n space i n space f i g u r space C a l c u l a t e space t h e space d i s p l a c e m e n t space o f space t h e space w e d g e space w h e n space t h e space b l o c space i s space r e l e a s e d space a n d space r e a c h e s space t o space t h e space b o t t o m space o f space t h e space w e d g e.$

PhysicsMechanics

Mechanics

Physics

$A c a r t space o f space m a s s space M space i s space a t space r e s t space o n space a space f r i c t i o n l e s s space h o r i z o n t a l space s u r f a c space a n d space a space p e n d u l u m space b o b space o f space m a s s space m space h a n g s space f r o m space t h e space r o o f space o f space t h e space c a r t. space T h e space s t r i n g space b r e a k s comma space t h e space b o b space f a l l s space o n space t h e space f l o o r comma space m a k e space s e v e r a l space c o l l i s i o n s space o n space t h e space f l o o r space a n d space f i n a l l y space l a n d s space u p space i n space s m a l l space s l o t space m a d e space o n space t h e space f l o o r. T h e space h o r i z o n t a l space d i s tan c e space b e t w e e r space t h e space s t r i n g space a n d space t h e space s l o t space i s space L. space F i n d space t h e space d i s p l a c e m e n t space o f space t h e space c a r t space d u r i n g space t h i s space p r o c e s s.$

PhysicsMechanics

Mechanics

Physics

$A n space e x p l o s i o n space b l o w s space a space r o c k space i n t o space t h r e e space p a r t s. space T w o space p i e c e s space g o space o f f space a t space r i g h t space a n g l e s space t o space e a c h space o t h e r semicolon space 1.0 space k g space p i e c e space w i t h space a space v e l o c i t y space o f space 12 space m space divided by space s space a n d space o t h e r space 2.0 space k g space p i e c e space w i t h space a space v e l o c i t y space o f space 8 space m space divided by space s. space I f space t h e space t h i r d space p i e c e space f l i e s space o f f space w i t h space a space v e l o c i t y space o f space 40 space m space divided by space s comma space c o m p u t e space t h e space m a s s space o f space t h e space t h i r d space p i e c e.$

PhysicsMechanics

Mechanics

Physics

$A space b o d y space o f space m a s s space 5 space m space e x p l o d e s space a t space r e s t space b r e a k space u p space i n t o space t h r e e space p a r t s. space I f space t w o space p a r t s space h a v i n g space e q u a l space m a s s e s space f l y space o f t space p e r p e n d i c u l a r l y space t o space e a c h space o t h e r space w i t h space a space v e l o c i t y space o f space 18 space m space divided by space s comma space t h e n space c a l c u l a t e space t h e space v e l o c i t y space o f space t h e space t h i r d space p a r t space w h i c h space h a s space a space m a s s space 3 space t i m e s space t h e space m a s s space o f space e q u a l space p a r t s.$

PhysicsMechanics

Mechanics

Physics

$A space 5.0 space g space b u l l e t space m o v i n g space a t space 100 space m space divided by space s space s t r i k e s space a space log. space A s s u m e space t h a t space t h e space b u l l e t space u n d e r g o e s space u n i f o r space d e c e l e r a t i o n space a n d space s t o p s space i n space 6.0 space c m. space F i n d space t h e space t i m e space t a k e n space f o r space t h e space b u l l e t space t o space s t o p$

PhysicsMechanics

Mechanics

Physics

$T h e space n e t space f o r c e space v e r s u s space t i m e space g r a p h space o f space a space r o c k e t space i s space s h o w n space i n space f i g u r e. space T h e space m a s s space o f space t h e space r o c k e t space i s space 1200 space k g space C a l c u l a t e space v e l o c i t y space o f space r o c k e t comma space 16 space s e c o n d s space a f t e r space s t a r t i n g space f r o m space r e s t. space N e g l e c t space g r a v i t y.$

PhysicsMechanics

Mechanics

Physics

$A space b a l l space o f space m a s s space m comma space t r a v e l l i n g space w i t h space v e l o c i t y space 2 i with hat on top plus 3 j with rightwards arrow on top space j r e c e i v e s space a n space i m p u l s e minus 3 m i with hat on top. space W h a t space i s space t h e space v e l o c i t y d space t h e space b a l l space i m m e d i a t e l y space a f t e r w a r d s ?$

PhysicsMechanics

Mechanics

Physics

$A space t r u c k space o f space m a s s space 2 cross times 10 cubed space k g space t r a v e l l i n g space a t space 4 space m space divided by space s space i s space b r o u g h t space t o space r e s t space i n space 2 space s space w h e n space i t space s t r i k e s space a space w a l l. space W h a t space f o r c e space left parenthesis a s s u m e space c o n s tan t right parenthesis space i s space e x e r t e d space b y space t h e space w a l l space ?$

PhysicsMechanics

Mechanics

Physics

$A space b u l l e t space o f space m a s s space 10 to the power of negative 3 end exponent k g space s t r i k e s space a n space o b s t a c l e space a n d space m o v e s space a t space 6 space r space t o space i t s space o r i g i n a l space d i r e c t i o n. space I f space i t s space s p e e d space a l s o space c h a n g e s space f r o m space 20 space m space divided by space s space t o space 10 space m space divided by space s. space F i n d space t h e space m a g n i t u d e space o f space i m p u l s e space a c t i n g space o n space t h e space b u l l e t space m equals 10 to the power of negative 3 end exponent k g.$

PhysicsMechanics

Mechanics

Physics

$A space p a r t i c l e space o f space m a s s space 2 space k g space i s space i n i t i a l l y space a t space r e s t. space A space f o r c e space s t a r t s space a c t i n g space o n space i t space i n space o n e space d i r e c t i o n space w h o s e space m a g n i t u d e space c h a n g e s space w i t h space t i m e. space T h e space f o r c e space t i m e space g r a p h space i s space s h o w n space i n space f i g u r e. space F i n d space t h e space v e l o c i t y space o f space t h e space p a r t i c l e space a t space t h e space e n d space o f space 10 space s.$

PhysicsMechanics

Mechanics

Physics

$A space t i m e space v a r y i n g space f o r c e comma space F equals 2 space t space i s space a c t i n g space o n space a space p a r t i c l e space o f space m a s s space 2 space k g space m o v i n g space a l o n g space x minus a x i s. space v e l o c i t y space o f space t h e space p a r t i c l e space i s space 4 space m space divided by space s space a l o n g space n e g a t i v e space x space minus a x i s space a t space t i m e t equals 0. space F i n d space t h e space v e l o c i t y space o f space t h e space p a r t i c l e space a t space t h e space e n d space o f space 4 space s.$

PhysicsMechanics

Mechanics

Physics

$A space b a l l space o f space m a s s space 200 space g space i s space p r o j e c t e d space w i t h space a space v e l o c i t y space o f space 30 space m space divided by space s space a t space 30 to the power of 0 space f r o m space h o r i z o n t a l. space U sin g space t h e space c o n c e p t space o f space i m p u l s e comma space f i n d space c h a n g e space i n space v e l o c i t y space i n space 2 space s. T a k e space g equals 10 space m space divided by space s squared.$

PhysicsMechanics

Mechanics

Physics

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

PhysicsMechanics

Mechanics

Physics

$A space b a l l space o f space m a s s space m space i s space a t t a c h e d space t o space a n space i n e x t e n s i b l e space l i g h t space s t r i n g. space N o w space t h e space b a l l space i s space r e l e a s e d space f r o m space t h e space p o s i t i o n space i n space t h e space s e c o n d space f i g u r e. space S u b s e q u e n t l y space w h i l e space f a l l i n g comma space s t r i n g space b e c o m e s space t a u t. A t space t h a t space m o m e n t space i m p u l s e space i m p a r t e d space b y space t h e space s t r i n g space t o space t h e space b a l l space w o u l d space b e$

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