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Dynamics HW4 Solutions

# Dynamics HW4 Solutions - Problem 4-1 The 4-kg collar starts...

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Problem 4-1: The 4-kg collar starts from rest at position 1 and slides down the smooth rigid wire. The y axis points upward, the spring constant is 20 N/m and its undeformed length is 3 m. What is the magnitude of the velocity of the collar when it reaches position 2?

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Problem 4-2: Masses A and B , each having a mass of 25 kg, are constrained to move in unidirectional slots, as shown in the diagram. The masses are connected by a light rod of length L = 300 mm. These masses are also connected to two massless linear springs, each having a spring constant k = 50 N/m. The springs are unstretched when the connecting rod is vertical. Determine the velocities of A and B , when A has descended a distance of 10 mm. Neglect friction in the slots and at the ends of the connecting rod.
Problem 4-2 (continued)

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The 20-lb package starts from rest, slides down the ramp, and is stopped by the spring. The coefficient of kinetic friction between the package and the ramp is 0.1. The package is brought to rest 4-in from the point of contact. What is the spring constant
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Dynamics HW4 Solutions - Problem 4-1 The 4-kg collar starts...

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