Anozzle is designed to accelerate the fluid from v1 to v2 in a linear fashion. that is, v = ax + b, where a and b are constants. if the flow is constant with v1 = 10 m/s at x1 = 0 and v2 = 25 m/s at x2 = 1 m, determine (a) the local acceleration; (b) the acceleration magnitude of the fluid at point (1); (c) the acceleration magnitude of the fluid at point (2).

Explanation:

v = ax + b

when x = 0 , v = 10 ( given )

10 = b

when x = 1 , v = 25

25 = a + b

25 = a + 10

a = 15

So

v = 15 x + 10

acceleration

v = 15 x + 10

differentiating it on both sides wrt t

a = dv / dt = 15 dx / dt

a = 15 v = 15 ( 15x + 10 )

a = 225x + 150

acceleration at x = 0

a = 150 m/s²

acceleration at x = 1 m

a = 225 + 150

= 375 m /s²

electromagnetic shielding is the practice of reducing the electromagnetic field in a space by blocking the field with barriers made of conductive or magnetic materials. shielding is typically applied to enclosures to isolate electrical devices from their surroundings, and to cables to isolate wires from the environment through which the cable runs. electromagnetic shielding that blocks radio frequency electromagnetic radiation is also known as rf shielding.

the shielding can reduce the coupling of radio waves, electromagnetic fields and electrostatic fields. a conductive enclosure used to block electrostatic fields is also known as a faraday cage. the amount of reduction depends very much upon the material used, its thickness, the size of the shielded volume and the frequency of the fields of interest and the size, shape and orientation of apertures in a shield to an incident electromagnetic

from wikipedia