Thursday, July 30, 2009


I'm Samuel Appiah; a full time student of Boston University and in my final year. I'm from West of Africa and a small country called Ghana. I signed up for this class because I am missing one natural science requirement and my advisor told me about the class.
I was recruited to play soccer for BU so I moved from Ghana to the states in 2006. My experience has not not been too bad neither has it been too fun, but i guess this class will add some fun to my stay in BU. Despite the fact that i'm a horrible swimmer, I really like the breeze from the ocean and the look of the ocean is something you can't resist. Later in the day, the ocean looks so peaceful and the breeze so refreshing.
With regards to the question as to which direction water drains in the sink in Australia, most sites have different views. But what reminds a fact is the idea of how the sink is molded; meaning, the shape of the sink can determine with direction water will drain from it. Others believe that Coriolis force can also determine water movement in a sink, but it has been argued that Coriolos force has no effect on how what drains in a sink.
People are with the view that, the duration of stagnation of water in a sink can also determine with direction the water will drain. Research shows that "in 1962 in the appropriately named Watertown, Massachusetts, the physicist Ascher Shapiro did just that. Built in a windowless room, Shapiro's circular sink was about two metres across and 150mm deep, with a tiny hole drilled in the middle that could be unplugged from below. After filling the sink with water, he left it to stand for more than three days. It took nearly an hour-and-a-half to drain, and sure enough the water went anticlockwise each time. Three years later, a group at the University of Sydney repeated the experiment, and as long as the water was allowed to stand for at least 18 hours, it always went down the plughole in a clockwise direction. "We have acquired confidence in the hypothesis that carefully performed experiments on liquid drainage from a tank will show clockwise rotation, if done in the southern hemisphere," they concluded" ( Based on this experiment, i can however say that the direction of water in a sink in Australia will drain either clockwise or anti closewise depending on the number of hours or days that the water had been in the sink, and also on how the sink has been molded and the temperature surronding the water in the sink.

My research is from

No comments: