tony8894 Posted October 5, 2014 Share Posted October 5, 2014 Hello Everyone. I attend an online high school and this is one of my assignments. I do not know what I need to do in order to complete this. Any help would be much appreciated Here is the Assessment I'm a sinker. If I try to float motionless in a pool I soon find myself vertical with just the tip of my head at the water surface. It is very easy for me to sit on the bottom of the pool. Maybe that's why I don't like to swim much. How about you? Do you sink like me or are you a floater? How would it be different if you were in alcohol, or vegetable oil, or glycerine, or sea water? Density is the key to your answers. Your answers must include: the densities of the 4 liquids involved (you will have to use your own resources for this), an approximation of your density (based on your floatability) expressed in relation to that of water, and if your answers would be different if you were doing this in a habitat on the moon. Link to comment Share on other sites More sharing options...
Fuzzwood Posted October 5, 2014 Share Posted October 5, 2014 Well you need the densities of the 4 liquids first, what are they? Link to comment Share on other sites More sharing options...
tony8894 Posted October 5, 2014 Author Share Posted October 5, 2014 The density of Vegetable oil is .92 g/cm3 or 920 kg/m3 The density of alcohol is .79 g/cm3 or 790 kg/m3 The density of glycerine is 1.26 g/cm3 or 1260 kg/m3 The density of sea water is 1030 kg/m3 or 1.03 g/cm3 Link to comment Share on other sites More sharing options...
Fuzzwood Posted October 6, 2014 Share Posted October 6, 2014 Ok now here is an important sentence: If I try to float motionless in a pool I soon find myself vertical with just the tip of my head at the water surface. <-- so this is still able to float somewhat, but not as much as an average person. What would this mean for the density of this person in regards to that of water. Will his density be lower, the same, or higher that that of water? Link to comment Share on other sites More sharing options...
tony8894 Posted October 6, 2014 Author Share Posted October 6, 2014 His density is higher? Because he does not fully float Link to comment Share on other sites More sharing options...
TJ McCaustland Posted October 10, 2014 Share Posted October 10, 2014 This all depends on the distribution of molecules, if the molecules are farther apart than water's then it will float, but this must be in proportion to it's weight and density. However all of this depends on how far away the molecules of the liquid are, too far and hardly anything will float. But this all must come after it's surface area, not enough and enough density and it will not float. Link to comment Share on other sites More sharing options...
Fuzzwood Posted October 10, 2014 Share Posted October 10, 2014 Yes his density is higher that that of normal water, but not too much as he is still able to float somewhat (think of air in his lungs that keep him afloat). So would a liquid need to have a higher, equal, or lower density that that of water to allow him to float comfortably? Link to comment Share on other sites More sharing options...
swansont Posted October 10, 2014 Share Posted October 10, 2014 ! Moderator Note Note: a response was hidden; this is the HW help section. Let the OP answer the question(s). Don't answer it for him (or her, as the case may be). If there is a point of discussion that comes up, please open a new thread for that discussion. Link to comment Share on other sites More sharing options...
tony8894 Posted October 10, 2014 Author Share Posted October 10, 2014 (edited) The Liquid would have to have a lower density in order for the person to to float. Edited October 10, 2014 by tony8894 Link to comment Share on other sites More sharing options...
TJ McCaustland Posted October 10, 2014 Share Posted October 10, 2014 (edited) Why did I say the former, Sorry *Brainfart* It seems I cannot remember how to do basic density calculations today, or haven't had enough coffee..... Note: a response was hidden; this is the HW help section. Let the OP answer the question(s). Don't answer it for him (or her, as the case may be). If there is a point of discussion that comes up, please open a new thread for that discussion. After all to each his own. Edited October 10, 2014 by TJ McCaustland Link to comment Share on other sites More sharing options...
Recommended Posts
Create an account or sign in to comment
You need to be a member in order to leave a comment
Create an account
Sign up for a new account in our community. It's easy!
Register a new accountSign in
Already have an account? Sign in here.
Sign In Now