作者Honor1984 (希望愿望成真)
看板TransPhys
标题Re: [考古] 请教考古题
时间Tue Jul 8 07:37:53 2008
※ 引述《reideen107 (理想一直都在)》之铭言:
: 6. Figure represents the total acceleration of a particle moving clockwise in
: a circle of radius
: 2.50 m at a certain instant of time. At this instant, find
: (a) the radial acceleration,
acos(π/6)
: (b) the speed of the particle, and
a = v^2 / r => v = √(ra)
: (c) its tangential acceleration.
asin(π/6)
: 7. A simple pendulum has a mass of 0.250 kg and a length of 1.00 m. It is
: displaced through an
: angle of 15.0 and then released. What are
: (a) the maximum speed,
MgL(1-cos(π/12)) = (1/2)MV^2
可以解出V
: (b) the maximum angular acceleration, and
在最低点的地方
V为(a)的结果
max a = (T-Mg)/M = V^2/L
: (c) the maximum restoring force?
左右两端的地方
Mgcos(π/12)
: 9.A 12.0-g wad of sticky clay is thrown horizontally at a 100-g wooden block
: initially at rest on
: a horizontal surface. The clay sticks to the block. After impact, the block
: slides 7.50 m before
: coming to rest. If the coefficient of friction between the block and the
: surface is 0.650, what
: was the speed of the clay immediately before impact?
滑行距离L
0^2 = (Vb)^2 - 2gμL
求出Vb
mv = (m+M)Vb
=>求出v
: 请敎一下,感谢@@"
: 附上题目网址
: http://0rz.tw/ab4hJ
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