ed by the im- pact of a meteorite of estimated 5 × 108kg tras-created act of a f

Question

ed by the im- pact of a meteorite of estimated 5 × 108kg tras-created act of a fore impa ter app cating o reat Arizona crater was created b timated 5 × 108 kg mass. The mete Meteorite impact The gre found near the crater appeared to have melted on nd nearth cole, indicating n a-C, the melting temperature of rock speed before impact was about 10,000 m/s. Large am solidified as it cooled, indicating that the temperature of he during impact reached at least 1700 °C, the melting ten then erature of the rock Consider Earth and the meteorite as the system. The state of the process is the meteorite moving fast just before hitin Earth's surface. The final state is several minutes after the collision What types of energy transformation occurred? The meteo kinetic energy before impact. In the collision, the meteorite dug a hole in Earth, forming the crater. The displaced soil was raised a distance approximately equal to the diameter of the meteorite This inelastic collision produced considerable internal energy- thermal energy of the meteorite and of Earth's surface matter at the collision site. If the temperature meteorite and/or parts of Earth may have undergone one or more phase changes. We summarize the process as follows: the rock. Is this possible? initial ing rite had change was high enough,the In the following questions, estimate different energies n tqstions, estimate different. ana changes. In addition to the information already given, you t energies and energy use and en the folowing: 300 kg/m' meteorite density; 840 1/kgf fusion cific heat for the solid meteorite; 2.7 × 105 J /kg heat or the same as that of iron; 1000 , spe- liquid meteorite, the same as that of iron; and 6.4 × porization, the same as for iron. 106 J/kg he at otva 78. EST T

Explanation / Answer

78. initial kinetic energy = 1/2 x 5 x 10^8 x 10000^2= 2.5 x 10^16 J answer is c

81.heat required = 5 x 10^8 x 840 x 1700= 7.14 x 10^14 J answer is c

82. heat required = 5 x 10^8 x 2.7 x 10^5 = 13.5 x 10^13 j=1.35 x 10^14 J

83. heat required= 5 x 10^8 x 1000 x 900 + 5x10^8 x 6.4 x 10^6= 4.5 x 10^14 + 32 x 10^14 = 36.5 x 10^14J=3.65 x 10^15 J answerd

84. yes

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