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By Foata D., Han G.-N.

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Related shocks generated a huge ocean wave ("tsunami") nearly forty meters in height, which brought total destruction to nearby shores and took over 35,000 lives. The total amount of kinetic energy released by the Krakatoa explosion was even more than Mount Saint Helens' energy. 5 X 10 18 joules. Incidentally, the kinetic energy of the Katmai volcano explosion in Alaska in 1912 was e = 2 X 10 19 joules. C. The estimated kinetic energy was e = 1 X 10 20 joules (about 1,200 thermonuclear bombs). If you are interested in learning more about volcanoes you might want to refer to Decker and Decker (1981) for Mount 49 50 CHAPTER 5 Saint Helens and to Simkin and Fiske (1983) for Krakatoa.

1) The first term on the left expresses the weight of the object, the second term the buoyant force, and the third term the drag force. In this equation, Ps is the density of the material composing the falling object, Pa is the density of air, g is the gravitational force per unit mass, and V is the volume. The acceleration of the object is a. 1) can be dropped. By definition, the acceleration, a = dU/dt and U = dy /dt, where y is the distance of fall and U is the velocity. 2) Case 1. Object Falling in a Vacuum Suppose there is no air.

LI TTL E T H I N G S FA L LIN G FRO M THE SKY Allegedly, it was from the top of this tower, in the year 1590 or so, that Galileo conducted his famous experiments on dropping objects. In their interesting book Engineering in History, Kirby et al. (1990) indicate that these experiments probably never happened. Maybe not, but it makes a good story. In any event, we assemble our research group on the seventh level of the tower (y = 45 m), about four hundred years later, to carry out some tests. We have four spheres to drop: two are made of iron and two of rock.

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