Bank robbers have pushed a 1000 kg safe to a 2nd story floor-to-ceiling window. They plan to break the window, then lower the safe 3.0 m to their truck. Not being too clever, they stack up 500 kg of furniture and ie a rope over a pulley. Then they push a safe out the window. Acceleration was too large and the safe slammed on the truck with large velocity (6.1 m/s), breaking through the truck floor. Now the robbers decide that they learned their lesson. They plan to redo, and decide that the safe should not hit the truck with a velocity less than 1.5 m/s. a) What is the max acceleration that they can have in order to limit the impact velocity to 1.5 m/s? b) To limit a value, robbers plan to put cloth on the furniture to increase friction. What is the minimum coefficient of friction they need to do this to make this work?
Bank robbers have pushed a 1000 kg safe to a 2nd story floor-to-ceiling window. They plan to break the window, then lower the safe 3.0 m to their truck. Not being too clever, they stack up 500 kg of furniture and ie a rope over a pulley. Then they push a safe out the window. Acceleration was too large and the safe slammed on the truck with large velocity (6.1 m/s), breaking through the truck floor. Now the robbers decide that they learned their lesson. They plan to redo, and decide that the safe should not hit the truck with a velocity less than 1.5 m/s.
a) What is the max acceleration that they can have in order to limit the impact velocity to 1.5 m/s?
b) To limit a value, robbers plan to put cloth on the furniture to increase friction. What is the minimum coefficient of friction they need to do this to make this work?
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