A ladder with a mass of 10 kg is leaning on a smooth (i. e., negligible friction) wall. The other end is on the ground, where friction keeps it from sliding. The ladder is 4.0 m long, and its center of mass is at its center. It touches the wall 3.2 m above the ground. The magnitude of the force that the wall exerts on the ladder:

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