第九章单元测试
Object M with weight P=10N, is placed on a smooth inclined plane, which can rotate about the Y-axis. Rope length L=2m, inclined angle θ=30°, and the uniform rotational speed n=10r/min, then the tension of the rope is （ ）.- If two particles have the same mass and are acted upon by the same force, their velocities and accelerations are equal at any instant. （ ）
As shown in the figure, the trolley moves upward along the inclined plane with the uniform acceleration a, and an object A with the mass m is placed on the flat top of the trolley to move with the trolley. In order to prevent the object from falling off from the trolley, the minimum static friction coefficient between the object and the trolley should be （ ）.
As shown in the figure, a small ball with mass m suspended by two ropes is at rest. If rope A is cut, the tension of rope B at this instant is （ ）.
The small ring slides from the top A of the fixed smooth half cylinder without initial velocity, as shown in the figure, then the position angle φ at which the ring is detached from the half cylinder is （ ）.
A:4.68N B:5.68N C:7.68N D:6.68N
答案:6.68N
A:错 B:对
A:
B:
C:
D:
A:
B:
C:
D:
A:58.2° B:45° C:50° D:48.2°
温馨提示支付 ￥3.00 元后可查看付费内容,请先翻页预览!
