Question

Jasmin filled a tumbler with water and covered its mouth with
a piece of cardboard as shown in the diagram. She held the
tumbler in one hand and kept the cardboard pressed tightly
with the other hand. She then inverted the tumbler carefully.
What will she observe if she removes her hand from the
cardboard? Justify your answer.
(b)
How does the broad bottom surface of the camel's feet
enable it to walk easily on sand?
A solid object that weighs 250 N is placed on a wooden plank
and a pressure of 35 pa is applied. Calculate the area of
contact between the object and the wooden plank.​

Answer 1

Answer

a) The cardboard will stick to the mouth of the container instead of falling down because of the atmospheric pressure inside the container pulling in the cardboard.

b) The broad bottom of the camel's feet enable it to walk easily on sand because the pressure applied in very less. If the camel's had small and thin feet their feet would easily sink into the sand. This is because: The smaller the area, the greater the pressure; The greater the area, the lesser the pressure.

c) Sorry don't know the answer to:

"A solid object that weighs 250 N is placed on a wooden plank

and a pressure of 35 pa is applied. Calculate the area of

contact between the object and the wooden plank.​"