Physics 24 Online
OpenStudy (anonymous):

Astronomers estimate that a 2 - km wide asteroid collides with the Earth once every million years. The collision could pose a threat to life on Earth. (a) Assume a spherical asteroid has a mass of 3200 kg for each cubic meter of volume and moves toward the Earth at 15 km/s. How much destructive energy could be released when it embeds itself in the Earth? (b) For comparison, a nuclear bomb could release about . How many such bombs would have to explode simultaneously to release the destructive energy of the asteroid collision with Earth?

OpenStudy (anonymous):

for me it could not be estimated right now.bcoz scientists were even cant able to measure the distructions of atom bombs, nuclear reactor , earthquakes,etc.,

OpenStudy (anonymous):

Assuming a spherical asteroid 2km wide with a density of 3200 kg/m3 using simple maths its mass will be 1.3 x 10^13kg Its kinetic energy will be 1.5 x 10^21 Joules. This will all get converted into sound, heat etc and this energy will cause the destruction. The 'Little boy' bomb dropped on Hiroshima was 6.3 * 10^13 Joules That means the kinetic energy of our asteroid would be 23,000,000 x the energy of the Hiroshima bomb.