a test tube is in the shape of a cylinder with a hemisphere of diameter 1 centimeter at the bottom. the test tube is filled with 15 milliliters of water to its brim. assume that the thickness of the tube is negligible. what is the length of the test tube to 3 significant digits?a test tube is in the shape of a cylinder with a hemisphere of diameter 1 centimeter at the bottom. the test tube is filled with 15 milliliters of water to its brim. assume that the thickness of the tube is negligible. what is the length of the test tube to 3 significant digits?