Buoyancy Definition and 413 Threads

I'm sure that if I can figure one of these out, then I will be able to understand how to compute all this buoyancy stuff. Anyways, here is is: What is the smallest area of a chunk of ice that is 1ft thick that will just support a 3000lb car.

Why does an object in a fluid experience both a buoyancy force and a drag force? How are they different and what causes these two different forces? Thanks. :-)

Would it be accurate to explain to 8th grade students that buoyant force illustrates Newton's third law in that gravity exerts a downward force on a fluid and the fluid, in turn, exerts an equal and opposite force on earth? Further explaining that since it is a fluid, that the reactive force...

Buoyancy problem, please check my work :) Can you check my work here? A crown is weighed in air and submerged in water. The scale reads 7.84 N in air and 6.86 N in water. find (a) the buoyant force (b) the volume of the crown (c) the density of the crown (d) is the crown made of gold...

I am using Spring Break to try to consolidate the information in the course I am taking. I have only two questions from the chapter on fluid dynamics unanswered: Q. Gas pressure inside an inflated stretched balloon is actually: (a) less than air pressure outside the balloon (b) greater than...

Forgive me in advance for what may be a dumb question. (i'm not a physicist_) I have this very hard to grasp thought that involves the Casimir experiment. If the force outside the plates is greater than in between them, could that make the experiment apparatus (in theory) less dense than...

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...