Please answer all. It is important
Answers
Answer:
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Answer:
a) WHAT TO DO:-
Once you have everything in place, fill up the glass with water right upto its brim. Carefully place the glossy side of the postcard down on the rim of the glass. Keep the palm of your hand placed on the card and turn the glass upside down.
WHAT HAPPENS:-
The card remains attached to the rim of the glass and does not allow the water to flow out.
WHY THIS HAPPENS:-
This happens because the air pressure exerted on the card from underneath is greater that the weight of the water inside the glass. This is why the card manages to hold up the water not letting it spill out.
TRY THIS:-
Use regular paper, cloth, a piece of cardboard to do this experiment. Will the water remain upside-down using these materials too?
b)
FLAT AND BROAD FEET OF CAMEL HELP IT TO WALK ON SAND BECAUSE THE BROADNESS OF THE FEET INCREASES THE SURFACE AREA TO SOME EXTENT WHICH IN TURN REDUCES THE PRESSURE EXERTED ON THE SAND AND PREVENTS IT FROM SINKING INTO SAND
c)weight of body = 250 N
area of contact = 10 m²
since the units are all in SI , there is no need to convert them.
pressure = force×area
here , the force is equal to the weight.
pressure = 250 × 10
= 2500 m²
hence , the pressure exerted by the object on the plank is 2500 N/m².