Question

Can someone help me on both of the questions?!

Answer 1

(1) The correct answer is: Pressure = P = 70 N/m²
 
Explanation:
Pressure is force per unit area. Mathematically, we can write Pressure as follows:
 
$P = \frac{F}{A}$ --- (1)

Where P = Pressure = ?
F = Force = 140N
A = Area = 2.0m²
 
Plug in the values in (1):
P = 140/2.0
P = 70 N/m²
 
(2) The air particles in the inflated balloon are in chaotic motion. They are moving randomly and colliding with each other and with the inner wall of the balloon, exerting pressure on the wall of the balloon. Furthermore, they are far apart from each other, which is why when you squeeze the balloon, its shape changes accordingly as long as you are putting pressure on it while squeezing.

Answer 2

Step-by-step explanation:

The expression for the pressure in terms of force is as follows;

$P= \frac{F}{A}$

Here, F is the force, P is the pressure and A is the area.

It is given in the problem that an object exerts 140 N of force on a surface that has an area of 2.0 meter square.

Put F= 140 N and A= 2 meter square in the above expression.

$P= \frac{140}{2}$

$P= 70 N/m^2$

Therefore, the pressure exerts on the object is 70 N/m^2.

The motion of air particles inside an inflated balloons:

In the inflated balloons, the molecules of air are far apart. These molecules are in random motion. They collide each other inside the surface of the balloons. The pressure will be exerted by the air molecules on the surface of the balloons. The pressure caused by atmospheric molecules collides with the outside the surface is equal to the pressure caused by atmospheric molecules collides with inside the surface of the inflated balloons. Therefore, the volume of the balloons remains constant.