課程名稱︰普通物理學甲
課程性質︰
課程教師︰黃暉理
開課學院：工
開課系所︰工海
考試日期（年月日）︰99/10/5
考試時限（分鐘）：50
是否需發放獎勵金：是
（如未明確表示，則不予發放）
試題 :
1. A batter hit a pitched ball when the center of the ball is 1.5m above the
ground.
The ball leaves the bat ay an angle of 45° with the ground. With the launch,
the ball should have a horizontal range of 110m.
(a)Does the ball clear a 7m-high fence that is 98m horizontally from the
launch point?
(b)At the fence, what is the distance between the fence top and the ball
center?
2. Three connected blocks are pulled to the right on a horizontal
frictionless table by a force of magnitude T3 = 144.0 N. If m1 = 12.0 kg, m2
= 24.0 kg, and m3 = 36.0 kg, calculate
(a) the magnitude of the system's acceleration,
(b) the tension T1, and (c) the tension T2.
┌────┐
┌────┐ │ │
┌───┐ T1 │ │ T2 │ │ T3
│ m1 │------ │ m2 │----│ m3 │-------
└───┘ └────┘ └────┘
3. The two blocks ( m = 20kg and M = 80kg ) are not attached to each other.
The coefficient of static friction between the blocks is μs=0.4,but the
surface beneath the large block is frictionless. What is the minimun
magnitude of the horizontal force F required to keep the smaller block from
slipping down the large block?
┌──────┐
┌──┤ │
──→ │ m │ │
F │ │ │
└──┤ │
│ M │
│ │
│ │
───┴──────┴──
4. The only force action on a4.0kg body as it moves alonge a positive x axis
has x component Fx = -3xN, with x in meters. The velocity at x = 3.0m is
10m/s.
(a)What is the velocity of the body at x = 5.0m?
(b)At what positive value of x will the body have a velocity of 15m/s?
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