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Solution K3-72 (Figure K3.7 condition 2 SM Targ 1988)
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Solution K3-72 (Figure K3.7 condition 2 SM Targ 1988)
A rectangular plate (Figure K3.0-K3.5) or a circular plate of radius R = 60 cm (Fig. K3.6-K3.9) rotates about a fixed axis with a constant angular velocity ω given in Table. K3 (with a minus sign, the direction of ω is opposite to that shown in the figure). The axis of rotation in Fig. K3.0-K3.3 and K3.8, K3.9 is perpendicular to the plane of the plate and passes through the point O (the plate rotates in its plane); in Fig. K3.4-K3.7 axis of rotation OO1 lies in the plane of the plate (the plate rotates in space). On the plate along the straight line BD (Figure K3.0-K3.5) or along the circumference of the radius R, ie along the rim of the plate (Figure K3.6-K3.9), the point M moves. The law of its relative motion, expressed in the equation s = AM = f (t) (s - in centimeters, t - in seconds), is given in Table. K3 separately for Fig. K3.0-K3.5 and for Fig. K3.6-K3.9, while in Fig. 6-9 s = AM and is counted along the arc of the circle; b and l are given there. In all figures, the point M is shown in the position at which s = AM> 0 (for s <0 the point M is on the other side of point A). Determine the absolute velocity and absolute acceleration of point M at time t1 = 1 s.
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