3
.
Answer the following questions in brief.
a. A plastic cube is released in water. Will
it sink or come to the surface of water?
b. Why do the load carrying heavy
vehicles have large number of wheels?
How much pressure do we carry on
our heads? Why don't we feel it?
C.
Answers
Thanks for asking the question
A.) When a plastic tube is released in water it will float on water because plastic have less density than that of water so it cannot displace water from its position and keep floating on it.
B.) The load carrying heavy vehicles have more wheels to increase the surface and decrease the pressure applied on the wheels. As we know that if the area in contact of a surface increases the pressure decreases. If we will not do so the wheels may be teared.
C.) We don't feel pressure on our heads because our body fluids i.e. blood and air also exert pressure and the resultant pressure will be zero so we don't feel the atmospheric pressure.
Hope it helps you :) !!
a. A plastic cube is released in water. Will it sink or come to the surface of water?
Answer:
A plastic cube is released in water it will come over the surface of water Because;
The density of plastic is less than that of water. Therefore, buoyant force acts on plastic cube in upward direction. As a result plastic cube will come to the surface of water.
b. Why do the load carrying heavy vehicles have large number of wheels?
Answer:
Load carrying heavy vehicles have large number of wheels because;
The pressure produced by the given force depends on the area of the surface on which force acts. The greater the surface area , the less is the pressure produced. Load carrying heavy vehicles have large number of wheels in contact with the road .
Hence , the load carrying heavy vehicles have large number of wheels.
c. How much pressure do we carry on our heads? Why don't we feel it?
Answer :
we carry atmospheric pressure on our heads of about 105 Pa(Pascal) . we don't feel it because this atmospheric pressure is balanced by the pressure created by the air and blood inside our body.