Two light pulses are emitted simultaneously from a source. The pulses take parallel paths to a detector 6.75 m away, but one moves through air and the other through a block of ice. Determine the difference in the pulses' times of arrival at the detector.

Scientist have use computer models to create a series of maps that show how susceptible coastal cities in island countries are to the sea rising at different levels. the map shows that a 1 meter rise would swap cities all along the us eastern seaboard. a 6-meter sea level rise with sub merge a large part of florida. thermal expansion has already raise the oceans 10 to 20 centimeters the most likely cause, directly and indirectly, for such a rise in sea level is