Basic Statistics for Epidemiology: Prevalence vs Incidence. In short, epidemiology is sort of the who what, when, why, how and where of disease. It doesnât involve any experimentation or clinical trials, so it is really of interest to public health, because it is just about what happens.
So if a queen-sized waterbed with a bladder-type mattress holds roughly 130 gallons of water that weighs in at 1,084 pounds plus the weight of the frame and two people.o keep the math simple let s assume that the mattress, frame and two adults weighs 1,300 pounds and that the bed assembly measures six feet by six feet taking up a total of 36 square feet of floor space. If we divide the weight of the bed by 36 the square footage-that gets us to 36 pounds per square foot.
That is trailer weight and tongue weight. Trailer weight is the total weight of the item you're towing. It's called trailer weight regardless of what it actually is. A 2000lb boat on an 800lb boat trailer is still 2800lb of trailer weight.Tongue weight is how much weight is pushing down on your hitch.our best bet is to go to a business that sells and installs hitches and or trailers. Tell them what you want to tow and ask them what kind of a hitch you'll need. A company that services holiday trailers and RV's would be a good place to start. The higher the hitch class, the more capacity it has and the bulkier it is.