課程名稱︰普通物理(甲)上
課程性質︰大一共同必修
課程教師︰黃暉理
開課學院：生農學院
開課系所︰生物產業機電工程學系
考試日期（年月日）︰12/24/2008
考試時限（分鐘）：50 minutes
是否需發放獎勵金：yes
（如未明確表示，則不予發放）
試題 :
1.A string oscillates according to the equation
Y'=(1cm)sin[(1/3cm^-1)x]cos[(40πs^-1)t]
What are the (a)amplitude and (b)speed of the two waves(identical except for
direction of travel)whose superposition gives this oscillation? (c)what is
the distance between nodes? (d)what is the transverse speed of a partical of
the string at the position x=2cm when t=1s ?
2.Two trains are traveling toward each other at 30m/s relative to the ground.
One train is blowing a whistle at 550Hz.(assume speed of sound in the air is
343m/s)
(a)What frequency is heard on the other train in still air?
(b)What frequency is heard on the other train if the wind is blowing at
30m/s toward the whistle and away from the listener?
(c)What frequency is heard if the wind direction is reversed?
3.At a result of a temperature rise of 35度C,a bar with a crack at its center
buckles upward.If the fixed distance L0 is 3m and the coefficient of linear
expansion of the bar is 25×10^-6/度C,find the rise x of the center.
╴╴╴╴╴╴╴╴╴╴
∣ ︱
█￣￣￣￣￣￣￣￣￣￣█
█← L0 →█ ↘
╴ ╴
╱╱↑╲╲
╱╱ X ╲╲
╱╱ ↓ ╲╲
█ █
█← L0 →█
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