Current location - Education and Training Encyclopedia - Educational institution - (2008? As shown in the figure, OA is a beam with uniform mass distribution, which is always in a horizontal state and is pulled by a light steel cable AB, O.
(2008? As shown in the figure, OA is a beam with uniform mass distribution, which is always in a horizontal state and is pulled by a light steel cable AB, O.
Let the length of OA rod be L, the gravity be G 1, and the weight be G2.

For the study of rod OA, based on the O-axis and moment balance conditions, it is obtained that

TLsinA=G 1 12L+G2X

T=G2sinAX+G 12sinA is obtained, and the T-X image is an inclined straight line without passing through the origin.

T=G2a2sinAt2+G 12sinA can be obtained from the problem X= 12at2. When t=0, T > 0 is a parabola with an upward opening. Therefore, A is correct.

So choose a.

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