Fifteenth Amendment ratified. The Fifteenth Amendment to the U.S. Constitution gave the vote to all male citizens regardless of color or previous condition of servitude. Joseph H. Rainey, first black member sworn in as member of U. S. House of Representatives. December 12, 1870.
The average density of the human body is 985 kg/m 3, and the typical density of seawater is about 1020 kg/m 3.a) Draw a free-body diagram of a human body floating in seawater and determine what percentage of the body's volume is submerged.b) The average density of the human body, after maximum inhalation of air, changes to 945 kg/m 3.) Draw a free-body diagram of a human body floating in seawater and determine what percentage of the body's volume is submerged. b) The average density of the human body, after maximum inhalation of air, changes to 945 kg/m 3.
The amount of blood in a human body varies, of course, with the size of that body. Over the range of sizes we usually encounter for average people, this is approximately 7% of body weight. And the density of whole blood, again on average, is about 1.06 grams/ml. So, for example, if a person weighs 185 lbs, in kilograms this converts to about 84 kg body size. Taking 7% of this gives 5.87 kg of blood.