3. Explain the following: (a) It is useful for camels to have large flat feet. (b) Stiletto heels are more likely to mark floors. (c) You can fill a bucket from a downstairs tap quicker than from an upstairs tap. (d) Trucks and buses have double tyres in the rear end. (e) A tin can collapses when air is removed from it.
Answers
Answer:
a)Camels have large flat feet so that there is a greater area in contact with the sand which produces less pressure on the sand and the camels can move easily on the sand.
b)Because of the very small heel, they tend to focus a great deal of pressure on a very small area of the floor. This is more likely to create marks from the shoe or into the tile.
c)We can fill a bucket from downstairs tap quicker than from an upstairs tap because due to gravitational Force the water exerts more pressure in downstairs tap as compared to upstairs tap. The water will come out of tap with a great force of pressure.
d)Buses and trucks have double wheels at the back because these are heavy vehicles with most of the loads resting towards the back. Also, the engine that drives the vehicle is attached to the back wheels so the double back wheels provides better hold on the ground
e)The air inside a tin can exerts pressure against the interior surface that pushes the walls of the can outward and the air outside of the can exerts pressure that pushes the sides inward. ... The result is that the tin can collapses when the air inside is removed