3rdLE_2007_summer_SampleExam

3rdLE_2007_summer_SampleExam - U n i v e r s i t y o f t h...

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Unformatted text preview: U n i v e r s i t y o f t h e P h i l i p p i n e s C o l l e g e o f S c i e n c e P H Y S I C S 7 1 S u m m e r 2 7 3 r d L o n g E x a m i n a t i o n N a t i o n a l I n s t i t u t e o f P h y s i c s 3 r d L o n g E x a m i n a t i o n P h y s i c s 7 1 A- 2 I N S T R U C T I O N S : C h o o s e t h e b e s t a n s w e r . I g n o r e a i r r e s i s t a n c e a n d f r i c t i o n , u n l e s s o t h e r w i s e s t a t e d i n t h e q u e s t i o n . A c c e l e r a t i o n d u e t o g r a v i t y i s 9 . 8 m / s 2 . 1 . S t a t E q C o n d i t i o n s . W h i c h o f t h e f o l l o w i n g a r e n e c e s s a r y c o n d i t i o n s t o a t t a i n s t a t i c e q u i l i b r i u m ? I . T h e o b j e c t s h o u l d b e s t a t i o n a r y o r m o v i n g a t c o n s t a n t s p e e d . I I . T h e n e t e x t e r n a l f o r c e o n t h e s y s t e m s h o u l d b e z e r o . I I I . T h e n e t e x t e r n a l t o r q u e o n t h e s y s t e m s h o u l d b e c o n s t a n t . A . I o n l y B . I I o n l y C . I I I o n l y D . I I a n d I I I o n l y E . I , I I a n d I I I 2 . C e n t e r o f G r a v i t y . W h i c h o f t h e f o l l o w i n g s t a t e m e n t s i s N O T N E C E S S A R Y r e g a r d i n g c e n t e r o f g r a v i t y ( A s s u m p t i o n s a r e m a d e o n t h e s u r f a c e o f t h e E a r t h , w h e r e a c c e l e r a t i o n d u e t o g r a v i t y i s a p p r o x i m a t e l y c o n s t a n t . ) ? I . T h e c e n t e r o f g r a v i t y a l w a y s c o i n c i d e s w i t h t h e c e n t e r o f m a s s . I I . T h e c e n t e r o f g r a v i t y i s a l w a y s a t t h e g e o m e t r i c c e n t e r o f a b o d y . I I I . T h e r e m u s t b e m a t e r i a l a t t h e c e n t e r o f g r a v i t y o f a n o b j e c t . A . I o n l y B . I a n d I I o n l y C . I a n d I I I o n l y D . I I a n d I I I o n l y E . I , I I a n d I I I 3 . S t a t E q R o d . O n e e n d o f a r o d i s t i e d t o t h e c e i l i n g b y a r o p e . T h e o t h e r e n d r e s t s o n a f r i c t i o n l e s s s u r f a c e . W h a t i s t h e b e s t c o n f i g u r a t i o n f o r t h e r o d t o b e i n s t a t i c e q u i l i b r i u m ? . . . . . I n s u f f i c i e n t i n f o r m a t i o n i s g i v e n t o s o l v e h e p r o b l e m . N a t i o n a l I n s t i t u t e o f P h y s i c s 3 r d L o n g E x a m i n a t i o n P h y s i c s 7 1 A- 3 c g c g . m . m . m 4 . W a t i s L e v e r a r m . T w o m a s s e s ( r e c t a n g l e a n d t r i a n g l e ) a r e p l a c e d o n a u n i f o r m s e e s a w w h i c h i s p i v o t e d a t t h e c e n t e r . T h e l e v e r a r m o f r e c t a n g l e i s _ _ _ _ _ _ _ a n d t h a t o f t r i a n g l e i s _ _ _ _ _ _ ....
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This note was uploaded on 08/11/2008 for the course PHY 71 taught by Professor Singidas during the Fall '08 term at University of the Philippines Diliman.

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3rdLE_2007_summer_SampleExam - U n i v e r s i t y o f t h...

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