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[answered] MAE 2323 Dynamics - UT Arlington 1. The space satellite in


MAE 2323 Dynamics - UT Arlington

1. The space satellite in Figure 5.6 has a mass of 125kg and a moment of inertia Iz = 0.94kgm2, excluding the four solar panels A, B, C, and D. Each solar panel has a mass of 20kg and can be approximated as a thin plate. If the satellite is originally spinning about z axis at a constant rate ?z = 0.5rad/s when ? = 90?,determine the rate of spin if all the panels are raised and reach the upward position, ? = 0?, at the same instant.

2. The 80kg man in Figure 5.7 is holding two dumbbells while standing on a turntable of negligible mass,which turns freely about a vertical axis. When his arms are fully extended, the turntable is rotating with an angular velocity of 0.5rev/s. Determine the angular velocity of the man when he retracts his arms to the position shown. When his arms are fully extended, approximate each arm as a uniform 6kg rod having a length of 650mm, and his body as a 68kg solid cylinder of 400mm. With his arms in the retracted position,assume the man is an 80kg solid cylinder of 450mm diameter. Each dumbbell consists of two 5kg spheres of negligible size.

Figure 5.6 and Figure 5.7 attached

 


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