♥️Hello FriendS! ♥️
_________________________________________
Q.1 Answer the questions in Breif :-
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 numbers of wheels?
c.) How much pressure do we carry on our heads ? why don't we feel it ?
Answers
━━━━━━━━━━━━━━━━━━━━
Q.1 Answer the questions in Breif :-
a. A Plastic Cube is Released in water, will it sink or come to the Surface of water?
Ans- It is decided by a concept of Buoyancy that whether a substance floats or sinks in water. Buoyancy or upthurst means the upward force exerted by the liquid on any particular object immersed in it. It depends upon the density of the body.
- A body with less density than water, or relative density less than 1 will float on water due to greater buoyant force.
- A body with greater density will sink in water.
- And a body will density equal density as of water will half submerged or partially submerged (i.e half in water, half in air).
The plastic is the light weight substance and have density less than water, thus it will float on water. This phenomenon has become the biggest reason for ocenic water pollution.
﹏﹏﹏﹏﹏﹏﹏﹏﹏﹏﹏﹏﹏﹏﹏﹏﹏﹏ ✍
b.) Why do the load carrying heavy Vehicles have Large numbers of wheels?
Ans- The load carrying heavy vehicles have a large weight thus, they exert a high pressure to the ground. This can even break the roads and can cause accident, to avoid this ,they have large no. of wheels which increase the surface area in contact with the ground, and the weight will be equally distributed and hence reducing pressure. It is because the pressure is inversely proportional to area of contact. This can be better understood by the formula for pressure i.e.
Thus, the load carrying heavy vehicles are provided with large no. of wheels.
﹏﹏﹏﹏﹏﹏﹏﹏﹏﹏﹏﹏﹏﹏﹏﹏﹏﹏ ✍
c.) How much pressure do we carry on our heads ? why don't we feel it ?
Ans- The atmosphere is around us i.e. the layer of air. As we know that gases also exerts pressure, hence we are carrying the entire atmospheric pressure of 1 atm i.e. 10^5 pascals. But, isn't it strange, that we are not able to feel anything? It is because of the blood that is flowing inside our body also exerts the same pressure in an outward direction and the atmosphere in the inward direction. Thus these pressure balances each other and have no effect on our body.
━━━━━━━━━━━━━━━━━━━━
Answer:
a. A plastic cube will float on the surface of water and will not sink. The property by which an upward force gets applied on object by the fluid and also opposes the force applied by the object on fluid is called buoyancy.
Plastic is lighter(in terms of density) than water so, it floats on the surface of water.
b. The more the weight of load the more the place is needed to place it and it will generally apply more pressure too.
As the vehicle will have more wheels it will be easier to spread the pressure to a big surface area and also it can handle the weight of the heavy load too.
If it will be having less wheels there are chances that the vehicle might slip or the pressure applied by load gets on one point too much and that place breaks.
c. We know that air is applying pressure on our body too. The standard value of atmospheric pressure is 14.7 pounds per square inch at sea level.
It means that this much pressure is already upon us from every side of body.
As blood is circulating in our body it applies pressure from inside.
Thus, both pressure balance each other.
As it is happening from our birth we are already used to handle this much pressure so, we are not able to feel it now.
As we know that any new thing we start gives us pain rather than the thing which we are doing regularly.