need some urgent help here

[thefrogman]

need some urgent help here
can any of you seawolvs help me with these questions?

An object weighs 100 kg/125 Ibs and displaces
100 Iitres/2 cubic feet of water.
Disregarding the minimal displacement of
the lead, how much lead weight do you need
to make it 20 kg/50 Ibs negatively buoyant in
sea water? (Round to closest kg/lb.)


An object weighs 237 kg/522Ibs and displaces
123 Iitres/4.4cubic feet of water. How
much additional sea water do you need to
displace to give the object 40 kg/80 Ibs posi
tive buoyancy? (Round to closest litre/cf.)


What is the absolute pressure in ata at
26 ml85 ft in fresh water? (Round to one
decimal place.)


You take a gas volume of 2 litres in a flexible
container from the surface to a depth of 17
m/56 ft in sea water. What will the new volume
be, and what will the density be compared
to the surface? (Round to one decimal
place.)
Volume: Density:

 

[jviehe]

need some urgent help here
can any of you seawolvs help me with these questions?

An object weighs 100 kg/125 Ibs and displaces
100 Iitres/2 cubic feet of water.
Disregarding the minimal displacement of
the lead, how much lead weight do you need
to make it 20 kg/50 Ibs negatively buoyant in
sea water? (Round to closest kg/lb.)


An object weighs 237 kg/522Ibs and displaces
123 Iitres/4.4cubic feet of water. How
much additional sea water do you need to
displace to give the object 40 kg/80 Ibs posi
tive buoyancy? (Round to closest litre/cf.)


What is the absolute pressure in ata at
26 ml85 ft in fresh water? (Round to one
decimal place.)


You take a gas volume of 2 litres in a flexible
container from the surface to a depth of 17
m/56 ft in sea water. What will the new volume
be, and what will the density be compared
to the surface? (Round to one decimal
place.)
Volume: Density:

That would be cheating.

 

[thefrogman]

all im asking is for some help on quest. i dont know

 

[ChrisA]

need some urgent help here
can any of you seawolvs help me with these questions?

Is this some home work problem in a class?

OK here is what you need to know: The bouent force on an object is equal to the volune of the water it displaces.

Let's see yo try and reson through one of the problems and people here can correct you if you make an error

I don't think anyone is going to just get the answers

 

[Ber Rabbit]

Another possible hint that you should be able to find in any open water text:
Fresh water weighs 62.4 pounds per cubic foot
Salt water weighs 64 pounds per cubic foot.
Ber :lilbunny:

 

[Ber Rabbit]

A hint I give my students for solving some volume problems:

volume you're looking for = (#ata where you are/#ata where you're going) x starting volume

Ber :lilbunny:

 

[thefrogman]

THX Ber,
that actualy helpd me

 

[CJ Waid]

Dude, you were so busted trying to cheat.

 

[scubak]

Ok...where is Lamont for this...
Hey...are you out there???
K

 

[Don Burke]

64 pounds per cubic foot

33 feet per atmosphere

volume times absolute pressure equals volume times absolute pressure

It is just arithmetic from there.

need some urgent help here
can any of you seawolvs help me with these questions?

An object weighs 100 kg/125 Ibs and displaces
100 Iitres/2 cubic feet of water.
Disregarding the minimal displacement of
the lead, how much lead weight do you need
to make it 20 kg/50 Ibs negatively buoyant in
sea water? (Round to closest kg/lb.)


An object weighs 237 kg/522Ibs and displaces
123 Iitres/4.4cubic feet of water. How
much additional sea water do you need to
displace to give the object 40 kg/80 Ibs posi
tive buoyancy? (Round to closest litre/cf.)


What is the absolute pressure in ata at
26 ml85 ft in fresh water? (Round to one
decimal place.)


You take a gas volume of 2 litres in a flexible
container from the surface to a depth of 17
m/56 ft in sea water. What will the new volume
be, and what will the density be compared
to the surface? (Round to one decimal
place.)
Volume: Density: