Assume that a 10-km asteroid hits the earth at about 20 km/s Computer simulations suggest that for large-energy impacts similar to the one described, water having about 3 times the mass of the asteroid is essentially instantly vaporized in an ocean impact. What fraction of the asteroid’s energy does the energy required to do this represent? About ___% of the asteroid’s energy is required to instantly vaporize water 3 times the mass of the asteroid.

Assume that a 10-km asteroid hits the earth at about 20 km/s Computer simulations suggest that for large-energy impacts similar to the one described, water having about 3 times the mass of the asteroid is essentially instantly vaporized in an ocean impact. What fraction of the asteroid’s energy does the energy required to do this represent? About ___% of the asteroid’s energy is required to instantly vaporize water 3 times the mass of the asteroid.