Barrel to fall spinning toward the ground
A 100-kg barrel with a radius of 25.9 cm has two ropes wrapped around it, as shown in the figure. The barrel is released from rest, causing the ropes to unwind and the barrel to fall spinning toward the ground.
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A piece of wire with mass per unit length 70 runs horizontally at right angles to a horizontal magnetic field. A 5.7 current in the wire results in its being suspended against gravity.
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