At 7:14 am on June 30, 1908, a huge explosinon eccurred above remote central Siberia, at latitude 61degrees N.

Question

and longitude 102degres E; the fire ball thus created was the bightest flash seen by anyone before nuclear weapons. The Tunguska Event, which according to one chance witness "convered and enormous part of the sky," was probably the explosion of a stony asteroid about 140m wide. (a) Considering only Earth's rotation, determine how much later the asteroid would hav had to arrive to put the explosion above Helsinki at longitude 25degrees E. This would have obliterated the city. (b) If the asteroid had, instead, been a metallic asteroid, it could have reached Earth's surface. How much later would such an asteroid have had to arrive to put the impact in the Atlantic Ocean at longitude 20degrees W?

Answer 1

For the asteroid to impact at 25 degrees E, the earth has to rotate an additional 77 degrees.
360 degrees in 24 hours = 77 degrees in 5.1 hours
77 degrees x 24 hours / 360 degrees = 5.1 hours

For the asteroid to impact at 20 degrees W, the earth would need to rotate an additional 122 degrees.
360 degrees in 24 hours = 122 degrees in 8.1 hours
122 degrees x 24 hours / 360 degreees = 8.1 hours

Answer 2

June 30 1908

Answer 3

1908 Asteroid