final_review_saturday

# final_review_saturday - Final Exam Review Questions...

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Artist rendering of the Stanford torus. NASA. Final Exam Review Questions December 8, 2007, 12-2 PM Calvin Berggren 1. A bug on a turntable, 9 cm from the center, is walking out from the center at 6 cm/s. The mass of the bug is 30 g. The mass of the turntable is 0.5 kg, and it is cylindrical with radius 15 cm. The turntable is turning at .5 rev/s. What is the force of static friction on the bug? If the turntable has a coefficient of static friction equal to 0.3, will the bug slip? 2. If creators of a space station were attempting to simulate gravity by designing the station in the shape of a circle and having it rotate about its axis, they would like to find out how fast the station would have to be rotating to have simulated gravity equal to that of Earth. Let us model the station as a disk with a hole, weighing 1 million kg, with inner radius 10 m and outer radius 15 m. Say that the “floor” of the space station is at a radius of 13 m.

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