secondary school physics question- Pressure

sgstudent09 SG

Hey!I am currently doing a worksheet on Pressure and I dont understand the Archimedes' Principle.The principle is says that the upthrust of an object immersed in a fluid is equal to weight of the fluid displaced by object.

(some of my queries: what is "displaced fluid", and how do you find the weight of the displaced fluid?)

some other questions regarding pressure:

a)how do scuba divers overcome the high water pressure when they breathe at great depths beneath the water surface?

b)why does a big lorry has many wheels as compared to a car? for this question, can i say that the wheels provide more surface area, so pressure decreases?

THANKS IN ADVANCE.

Tragic Clown SG

the weight of displaced fuild is your weight

ypu can get your weight on a weighing scale

a) training and more training. SDU is the elite force in the Navy

b) Yes and to prevent the lorry from toppling

ThunderFbolt SG

The weight of the displaced fluid is not your weight, but the product of the volume of the item and the density of the fluid the item is in. And you actually get your mass from a weighing scale. =D

The displaced fluid is just a "chim" word for this: You jump into a pool, the water rises right? The water is rising because you, now in the water, took up the space that the water was originally in. And now you in the water can float right? Cos the water around you is exerting a force on you in all directions on your body, with a net force upwards on your body. This force (called buoyant force) is acting in a direction opposite to your actually weight, hence you feel lighter in water. Because you are lighter.

SBS2601D SG

the weight of displaced fuild is your weight

ypu can get your weight on a weighing scale

a) training and more training. SDU is the elite force in the Navy

b) Yes and to prevent the lorry from toppling

SDU is the elite dating team from S'pore.

NDU is the elite SAF team.