Khát v?ng - Aspiration
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Give a slender slat being homogeneous, having equilateral section, mass m, length l, can turn round the horizontal axis going through one slat tip and being perpendicular to the slat. Skip friction in rotation axis and environmental resistance. The inertia moment of slat with respect to the rotation axis is ml²/3 and the free fall acceleration is g. If the slat is dropped zero first velocity from horizontal position, when the slat goes to vertical position, it will have an angle speed ? is
A. ?[3g/(2l)].
B. ?[2g/(3l)].
C. ?(3g/l).
D. ?[g/(3l)].
A. ?[3g/(2l)].
B. ?[2g/(3l)].
C. ?(3g/l).
D. ?[g/(3l)].