課程名稱︰普通物理學甲
課程性質︰大一選修
課程教師︰蘇德潤
開課系所︰機械系
考試時間︰94/11/11 10:20~12:10
試題 :
1.(a) If the net force Ｆ is sum of two forces Ｆ１ and Ｆ２ on a plain with
components(Fix，Fiy; i=1,2),what are the components of Ｆ２ when the two of
Ｆ２ are perpedicular to Ｆ１？(１０%)
(b) When there is an force arm ｒ for all Ｆ and Ｆｉ,what are the magnitudes
and differences of torques τa, τb of the net forces for these two Ｆ２ ? Draw
a figure to explain. (１５%)
2.An early method of measuring the speed of light makes use of a rotating slo-
tted wheel.A beam of light passes through one of the slots at the outside edge
of the wheel,as in Fig.10-31,travels to a distant mirror,and retures to the wh-
eel just in time to pass through the next slot in the wheel.One such slotted
wheel has a radius of 5.0cm and 500 slots around its edge. Measurements taken
when the mirror is L = 500m from the wheel indicate a speed of light of 3.0*10^5
km/s (a)What is the (constant)angular speed of the wheel?(b) what is the linear
speed of a point on the edge of the wheel?(Problem in textbook 10-29) (２５%)
3.In Fig.8-50,a block slides along a track from one level to a higher level
after passing through an intermidiate valley. The track is frictionless until
the block reaches the higher level.There a frictional force stops the block in
a distance ｄ.The block's initial speed ｖo is 6.0 m/s, the height difference
ｈ is 1.1m, and the μk is 0.60.Find ｄ (Problem 8-50) (２５%)
4.Figure 6-5a shows a coin of mass m at rest on a book that has been tilted at
an angle θ with the horizontal.By experimenting,you find that when θ is increased
to 13度,the coin is on the ｖｅｒｇｅ of slinding down the book,which means that
even a slight increase beyond 13度 produces sliding. What is the coefficient
of static friction μs between the coin and the book?(Sample Problem 6-3)(２５%)
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