第十章单元测试
The length of the rod AB is 40cm, the original length of the spring is 20cm, the spring constant k=200N/m, and the moment of couple M =180Nm. When the rod AB moves from the position shown in the diagram to the horizontal position A'B, find the work of the elastic force and the work of the couple M.（ ）
Determine the moment of inertia of a homogeneous disk (mass m, radius r) about the O-axis, where the distance between the O-axis and the mass center C is e. （ ）
The homogeneous bar AB, with mass m and length l, rotates about axis A with angular velocity ω, and axis A moves horizontally with velocity v. Find the kinetic energy of bar AB at the moment shown in the figure. （ ）
If the pendulum is released from the horizontal position, the velocity of its bob in the vertical position is （ ）.
The center of a homogeneous wheel (mass m, radius r) has the velocity v0 in the initial position as shown in the figure. The wheel rolls without slipping. Calculate the velocity v of its center in the position shown by the broken lines.（ ）
A:-1.46 J, -30π J B:1.46 J, -30π J C:1.46 J, 30π J D:-1.46 J, 30π J
答案:1.46 J, -30π J
A:
B:
C:
D:
A:
B:
C:
D:
A:21 m/s B:3.8 m/s C:6.9 m/s D:14.7 m/s
A:
B:
C:
D:
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