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Two blocks of different metals are sitting on a steel platform as shown. The blocks are connected by a cord running over a frictionless pulley.

Two blocks of different metals are sitting on a steel platform as shown. The blocks are connected by a cord running over a frictionless pulley. The aluminum block has mass m1 = 4.60 kg and the copper block has mass m2 = 6.25 kg, and ? = 31.5. The blocks are released from rest.

1.) Will they move? If the blocks move, what is the magnitude of the acceleration (in m/s2) of the two-block system?

2.) If the blocks move, what is the magnitude of the tension force (in N) in the cord?

3.) If the blocks do not move, what is the sum of the magnitudes of the forces of friction (in N) acting on the blocks?

image text in transcribed
Coefficients of Friction Rubber on concrete 1.0 0.8 Steel on steel 0.74 0.57 Aluminum Aluminum on steel 0.61 0.47 Glass on glass 0.94 0.4 Copper on steel 0.58 0.36 72 1 Copper Wood on wood 0.25-0.5 0.2 Waxed wood on wet snow 0.14 0.1 Waxed wood on dry snow 0.04 Metal on metal (lubricated) 0.15 0.06 Teflon on Teflon 0.04 0.04 Steel Ice on ice 0.1 0.03 Synovial joints in humans 0.01 0.003 Note: All values are approximate. In some cases, the coefficient of friction can exceed 1.0

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