What pressure difference is required between the ends of a 2.0-m-long, 1.0-mm-diameter horizontal tube for 40 C water to flow through it at an average speed of 4.0 m/s?

Answer : The pressure difference required is,

Explanation : Given,

Length of tube = 2.0 m

Diameter of tube = 1.0 mm = 1.0 × 10⁻³

Average speed of water = 4.0 m/s

Viscosity of water at 40°C = 0.7 × 10⁻³

The expression used for pressure difference is:

where,

= pressure difference

= viscosity of water = 0.7 × 10⁻³

L = length of tube = 2.0 m

A = area of tube =

= average speed of water = 4.0 m/s

Now put all the given values in the above expression, we get:

Thus, the pressure difference required is,

the working equation for the angular size is the product of the physical size and 360 degrees divided by the product of two pi and distance from earth. the minimum size would be 0.559 degrees while the maximum size would be 0.49 degrees. 

the displacement produced by the body.  

the amount of force subjected to the body.  

the angle between the direction of force and displacement