Which One Faster?

In the case of this picture is : There is a boy that dropping the two stone. One stone is 10 kg Mass, and the other one is 5 kg. So, which faster?

Answer: Really, in the Rule of Newton Energy,

Potential Energy at Possition + Kinetic Energy Possition = constant


So

Ep1A = Energy potential in position 1
Ep2A= Energy potential in position 2

Ek1A = Energy kinetic in position 1
Ek2A = Energy kinetic in position 2

EpA1+EkA1 = EpA2 + EkA2

mA g1 h1 + (mA. (v1^2))/2 = mA g2 h2 + (mA. (v2^2))/2

g1 = g2

so

mA g1 h1 + mA.(v1^2)/2 = mA g2 h2 + mA.(v2^2)/2

You can think that at the position 1, there is no VELOCITY, and the Position 2 there is no height. So, you can remove some formulas like this

mA g1 h1 = mA.(v2^2)/2

so you can see that the mass is will removed from the formula, so there is no influence with the mass.

So

g1 h1 = (v2^2)/2

and

h = (v^2)/2g

g = (v^2)/2h

g = v . t

v = square of 2gh

so velocity of the first mass will same with second

PUMP and Compressors - Part 1(PUMP)

What is PUMP? What is Compressor? What is different of them? So you can follow on this article. Pumps is the machine that have a function to increase up the head of fluid. Head are definite as Energy per unit weight, and have unit as the same as the long unit.

head as symbolized as h, head total of pump have three sectional of head

1. static head = z, definite as the height head. It can be count as the differential of height of suction and discharge
2. kinetics head = v²/2g
3. pressure head = P

There are many type of pump. In majority we can describe:

1. Displacement Pump, such as reciprocating and rotary pumps
   
2. Non-Displacement Pump, such as centrifugal pump, axial pump
   

Nozzle And Diffuser

The wrong opinion of Nozzle Description : "Nozzle is one equipment to make some fluid are jump out from the inside place". But the right description of Nozzle is: "The Energy Conversion to change the PRESSURE as potential energy, to movement as kinetics energy".

The other equipment that have reverse duty is DIFFUSER. The diffuser have a duty:"Convert the fluid movement as kinetics energy to the pressure as potential energy.