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Unformatted text preview: Not Quite around the Globe Description: A block is sliding off a large globe; find the height at which it leaves the surface using a combination of energy and Newton’s Second Law. A large globe, with a radius of about 5 m, was built in Italy between 1982 and 1987. Imagine that such a globe has a radius R and a fric- tionless surface. A small block of mass m slides down from the top of the globe as shown in the figure. The point of this problem is to find h crit , the height above the ground where the block leaves the surface of the globe. Part A: Consider what happens at the moment when the block is just about to separate from the globe. Which of the following statements are correct? a. The net acceleration of the block is directed straight down. b. The component of the force of gravity toward the center of the globe is equal to the magnitude of the normal forc c. The force of gravity is the only force acting on the block....
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