Question

what is thurst and write its SI unit

define pressure and write its unit

why are sharp knives being used for cutting vegetables

why do nails have pointed tips

why does school bags have broader straps

what si upthrust or buoyant foce

why does a cork float water wherasa iron nail sinks in water

what is relative density

state archimedes principle

state the applications of archimedes principle

Answer 1

THE FORCE ACTING ON A BODY PERPENDICULAR TO ITS SURFACE IS THRUST.S.I UNIT IS NEWTON (N).
THRUST PER UNIT AREA IS CALLED PRESSURE.S.I UNIT ISNEWTONS PER SQUARE METRE(N/m2)OR PASCAL (Pa)

A SHARP KNIFE HAS VERY THIN EDGE TO ITS BLADE. A SHARP KNIFE CUTS VEGETABLES BECAUSE DUE TO ITS VERY THIN EDGE,THE FORCE OF OUR HAND FALLS OVER A VERY SMALL AREA OF THE OBJECT PRODUCING A LARGE PRESSURE.
A SCHOOL BAG HAS BROADER STRIP SO THAT THE WEIGHT OF BAG MAY FALL OVER LARGE AREA OF THE SHOULDER OF THE CHILD PRODUCING LESS PRESSURE ON THE SHOULDER.AND ,DUE TO LESS PRESSURE IT IS MORE COMFORTABLE TO CARRY THE HEAVY SCHOOL BAG.

THE UPWARD FORCE EXERTED BY LIQUID IS CALLED UPTHRUST.OR BUOYANT FORCE.

THE DENSITY OF CORK IS LESS THAN THAT OF WATER SO CORK FLOATS IN WATER WHEREAS IRON NAIL SINK IN WATER AS IRON NAIL HAS MORE DENSITY THAN WATER.
RELATIVE DENSITY OF A SUBSTANCE=DENSITY OF THE SUBSTANCE/DEMSITY OF WATER.THE RELATIVE DENSITY OF A SUBSTANCE IS THE RATIO OF THE MASS OF ANY VOLUME OF THE SUBSTANCE TO THE MASS OF AN EQUAL VOLUME OF WATER.
ARCHIMEDES PRINCIPLE

WHEN A BODY IS IMMERSEDULLY OR PARTIALLY IN A FLUID ,IT EXPERIENCE AN UPWARD FORCE EQUAL TO THE WEIGHT OF THE FLUID DISPLACED BY IT.

APPLICATIONS
IT IS USED IN DESIGNING SHIPS AND SUBMARINES.
LACTOMETRE WHICH ARE USED TO DETERMINE THE PURITYOF SAMPLE OF MILK AND HYDROMETERS ARE BASED ON THIS PRINCIPLE.
THIS PRINCIPLE IS ALSO USED IN DESIGNING SHIPS AND SUBMARINES.

PLZ MARK THIS ANS AS BRAINLIST