121ss06fin_sol - Phy 121 Spring 2006 Final Exam Solutions...

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Phy 121 Spring 2006 Final Exam Solutions: Version A “Midterm 3 Part”: 1. (1) (A) Car is receding from the reflecting wall, " < , with : " > v f f f λ = . (2) (C) " " Car Car Car Car v v v v f f f f v v v v - + = = + - (3) (E) 2 4 P I d π = (4) (C) 2 2 2 -4 340 24 20 " 400 461 , =6.37 10 / 340 24 4 4 50 Car Car v v P f f Hz I W m v v d + + = = = = = × - - 2. (5) (D) 4 ( / 2) 8 d P Q L η = , decreases with increasing L (6) (B) 4 8 ( / 2) P L R Q d = = (7) (A) 3 4 4 6 ( / 2) (0.002/ 2) 2000 7.86 10 / 8 8 0.001 0.1 d P Q m s L - × = = = × × × (8) ( B ) 1 2 1 1 1 1 1 2 2 P P R R R R R R R R = + = + = = (9) (D) 4 4 4 ( '/ 2) ' ' constant ( '/ 2) ' constant (1.8 / 2) (2 ) 8 d P Q d P d P L = = × = × 4 4 = constant 1.8 2 ( / 2) ( ) = 21.0 constant d P Q × × × × × 3. (10) (C) The water temperature is lowered to 0 0 C (11) (A) The ice raises its temperature to 0 0 C before it melts (12) (D) 0 w w w ( 0 ) m c T C - (13) (A)
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121ss06fin_sol - Phy 121 Spring 2006 Final Exam Solutions...

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