Buoyancy Definition and 407 Threads

1) What is the mass of a column of air that has a cross-sectional area of 1 square centimeter and that extends from sea level to the top of the atmosphere? What is the weight of this air column? What is the pressure at the bottom of this column? 2) Is the value for atmosphere pressure...

Here's a little puzzle that may provide some amusement. (I hope it's not too trivial!) I have attached a (rough) diagram to accompany the following description. Consider an empty tank with a circular hole in its bottom. (The tank is supported by a table that also has a hole it.) Also...

I'm trying to do a lab for my physics class. It wants me to calculate the weight of the water displaced when I put a 500-g mass in a cup of water. I know the volume which is 59.0 ml. And I also know that the Buoyant force i s 0.56 N. I thought that the Buoyant force equals the volume of the...

I have a question that reads "A container of water is placed on a scale and the scale reads 120g. Now a 20 g piece of copper (specific gravity = 8.9) is suspended from a thread and lowered into the water but does not touch the bottom of the container. What will the scale now read round off to...

Let's say that I rig up a truck to a giant helium balloon, but I load up the back of the truck with enough stones so that the truck has reached a state of neutral buoyancy--its just floating in mid-air, not rising not falling, just there. Now let's say I take away a one-pound rock from the...

I have a homework question and it's taking me forever to figure it out. I can't seem to get the right answer. :frown:

Could someone please give me an accurate description of gravity, force, and buoyancy, and the relationships between them? F=ma, or Fg=G*((m1*m2)/(d*d)) ? Which is used in which situation? Does buoyancy affect weight, or merely counteract the effect of weight? Stuff like that would be...