Engr240-HW8 - Engr240-HW8 Amelito Enriquez Canada College...

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Engr240-HW8 Amelito Enriquez: Canada College
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Chapter 13, Solution 134 The block does not move until 4 lb. P From 0 to 2 s, 5 . t t P t Thus, the block starts to move when 4/5 0.8 s. t ( a ) For 0 2 s t , , 5 P t 1 2 1 0.8 s 2 s, 0 t t v 2 1 1 2 1 2 5 2 0.8 ( ) 4 0 5 4(2 0.8) t t mv Pdt W t t mv tdt v g 2 2 2 2 (32.2 ft/s ) 5 lb/s [(25) (0.8 s) ] (4 lb)(25 0.8 s) (4 lb) 2 v 2 28.98 ft/s v 2 29.0 ft/s v ( b ) From 2 s to 3 s t t 2 2 3 29.0 ft/s, from ( ) 10 lb 2 s 3 s 2 s 3 s v a P t t t # # 3 2 2 3 2 3 3 3 2 ( ) 4 4 (29.0) 10 4(3 2) t t mv Pdt W t t mv dt v g g 2 3 3 3 (32.2 ft/s ) (29.0 ft/s) [(6 lb)(1s)] (4 lb) 29.0 48.3 77.3 ft/s v v v 3 77.3 ft/s v
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Chapter 13, Solution 156 ( a ) 0 A B m m m e Conservation of total momentum . 2 A B mv mv mv 1 ( ) 2 A B v v v   ( b ) Energy loss .   2 2 2 2 ( ) 1 1 ( ) 2 2 L A B A B L A B E T T T T E m v v m v v From ( a ), 1 ( ) 2 A B v v v         2 2 2 2 2 2 2 2 2 2 1 1 1 ( ) 2 2 2 1 1 2 2 4 1 2 4 1 ( ) 4 L A B A B L A B A A B B L A A B B A B E m v v m v v E m v v m v v v v E m v v v v m v v
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Chapter 13, Solution 173 Directions x , y , n
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Engr240-HW8 - Engr240-HW8 Amelito Enriquez Canada College...

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