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Q5:
Ql: The velocity of pomt O of the bat is Vo = —183i—4.27j (m/s), and the bat rotates about the z axis with a counterclockwise angular velocity of 4 rad/s. What are the x and y coordinates of the bat’s instanta- neous center? Q2: The bar is in two-dimensional motion y in the x—y plane. The velocity of point A is vy = 8i (m/s), and B is moving in the direction parallel to the bar. Determine the velocity of B (a) by using Eq. (17.6) and (b) by using the instantaneous center of the bar. Q3: Bar 4B rotates with a counterclock- wise angular velocity of 10 rad/s. At the instant shown, what are the angular velocities of bars BC and CD? (See Active Example 17.4.) Qa: The crank 4B is rotating in the clock- y wise direction at 2000 spm (revolutions per minute). (a) At the instant shown, what are the coordinates of the mstantaneous center of the connecting rod BC? (b) Use instantaneous centers to determine the angular velocity of the connecting rod BC at the instant shown. Qs: The horizontal member ADE support- ing the scoop is stationary. The link BD is rotating im the clockwise direction at 1 rad/s. Use instantaneous centers to determine the angular velocity of the scoop. Q6: In a test of an energy-absorbing bumper, a 12700 N car is driven into a barrier at 8knvh. The duration of the impact is 0.4 seconds. When the car rebounds from the barrier, the magnitude of its velocity is 1.6 knv/h. (a) What is the magnitude of the average horizontal force exerted on the car during the impact? (b) What is the average deceleration of the car during the impact? 
