Question

A man exert a pressure of 14pa by applying a force of 70N on a box calculat​

Answer 1

Pressure, P = 14 pascal

P = 0.00014 bar

Force, F = 70 N

P = Force / Area

Answer 2

Correct Question:

A man exerts a pressure of 14 pa. By applying a force of 70N on a box calculate the area over which the force is applied ?

Answer:

area = 5N/Pa

Explanation:

• Given :

Pressure = 14 pa

Force = 70N

• To find :

Area = ?

• Procedure :

$\sf{ \boxed { \sf {p = \dfrac{force}{area} }}}$

$\sf \: \implies \: 14 \: p.a = \dfrac{70}{area}$

$\sf \implies \: area = \frac{70}{14}$

$\sf \: area \: = 5N/Pa$

or

$\sf \: area \: = \: 5 \: {Nm}^{2}$

What you need to know ?

Pressure : It is a perpendicular force applied by an to an object or by a fluid.

Force : In simple language force is a push or pull on an object by an object. Force has both magnitude and direction , which means it is a vector quantity.

Area : Area is the amount of space within a confined boundary.

In the above question we studies about the pressure exerted by an object. But what about the pressure at a point of liquid ?

Pressure = Height of liquid (h) × density of the liquid (d) × acceleration due to gravity (a).

The pressure at a point in fluid is directly proportional to the depth of point from surface area or height of the fluid column above that point , the density of the fluid and acceleration due to gravity .

The instruments used for the measurements of the atmospheric pressure are called barometers

Different types of barometers are :

• Mercury of Torricelli an barometer

• Fortin's barometer

• Aneroid barometer

• Unit of pressure :

SI unit : Nm^-2

C.G.S unit : dynes cm ^-2

Conversion Table For Pressure :

1Pa = 1 N m^-2

1Nm^-2 = 9.8 Pa

1pa = 10 dyne cm^-2

1bar = 10^5 Pa