The current theory of the structure of the Earth, called plate tectonics, tells us what the continents are in constant motion. Assume that the North American continent can be represented by a slab of rock 5850km on a side and 35km deep and that the rock has an average mass density of 2750kg/m^3. The continent is moving at the rate of about 3.2cm/year. what is the kinetic energy of the continent ? answer in the units of J
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In a game of pool, ball a is moving with a velocity v0 of magnitude v0 = 15 ft/s when it strikes balls b and c, which are at rest and aligned as shown. knowing that after the collision the three balls move in the directions indicated and assuming frictionless surfaces and perfectly elastic impact (that is, conservation of energy), determine the magnitudes of the velocities va, vb, and vc.
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The current theory of the structure of the Earth, called plate tectonics, tells us what the continen...
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