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When a slice of buttered toast is accide...

When a slice of buttered toast is accidentally pushed over the edge of a counter, it rotates as it falls. If the distance to the floor is 76 cm and for rotation less than 1 rev, what are the (a) smallest and (b) largest angular speeds that cause the toast to hit and then topple to be butter-side down?

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To solve the problem of the buttered toast falling off the counter and determining the smallest and largest angular speeds that cause it to hit and then topple butter-side down, we will follow these steps: ### Step 1: Calculate the time of fall We know the height \( h = 0.76 \, \text{m} \) and the acceleration due to gravity \( g = 10 \, \text{m/s}^2 \). The time \( t \) it takes to fall can be calculated using the formula: \[ t = \sqrt{\frac{2h}{g}} \] Substituting the values: ...
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When a slice of buttered toast is accidentally pushed over the edge of a counter, it rotates as it falls. If the distance to the floor is 80 cm and for rotation less than 1 rev , what are the (i) smallest and (ii) largest angular speeds that cause the toast to hit and then topple to be butter-side down ?

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Even some seasoned roller coaster riders blanch at the thought of riding the Rotor, which is essentially a large, hollow cylinder that is rotated rapidly around its central axis. Before the ride begins, a rider enters the cylinder through a door on the side and stands on a floor, up against a canvas covered wall. The door is closed, and as the cylinder begins to turn, the rider, wall, and floor move in unison. When the rider's speed reaches some predetermined value, the floor abruptly and alarminglly falls away. The rider does not fal with it but instead is pinned to the wall while the cylinder rotates, as if an unseen (and somewhat unfriendly) agent is pressin the body to the wall. Later, the floor is eased back to the rider's feet, the cylinder slows. and the rider sinks a few centimeters to regain footing on the floor. (Some riders consider all this to be fun.) Suppose that the coefficient of static friction mu_(s) between the rider's clothing and the canvas is 0.40 and that the cylinder's radius R is 2.1 m. a. What minimum speed v must the cylinder and rider have if the rider is not to fall when the floor drops? b. If the rider's mass is 49 kg, what is the magnitude of the centripetal force on her?

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