Impinging air jets may be used to clean particles from surfaces. The kinetic energy per unit volume (J/m3) of an air jet at a surface, Er, may be written as:
E=1/2*(rho*v2)* k*d-1.3
Where:
rho = density of air (1.3 kg/m3),
v = air velocity
k = proportionality constant (0.4 mm 1.3)
d = distance from the jet nozzle (10 mm).
For a sphere (A4 = 1x10-19 J) adhered to a flat surface (A2 = 1x10-20 J), find:
1. What size of particle (diameter) could a hurricane force wind (v = 118 km/h) remove from a
surface?
2. What size of particle can be removed at v = 340 m/s (speed of sound)?
3. What air velocity would be required to remove a 1 mm particle and a 100 nm particle?

Neptune is the eighth planet from the sun. it was the first planet to get its existence predicted by  mathematical calculations  before it was actually seen through a telescope on sept. 23, 1846. irregularities in the orbit of  uranus  led french astronomer alexis bouvard to suggest that the gravitational pull from another celestial body might be responsible. german astronomer johann galle then relied on subsequent calculations to   spot neptune via telescope. previously, astronomer galileo galilei sketched the planet, but he mistook it for a star due to its slow motion. in accordance with all the other planets seen in the sky, this new world was given a name from greek and roman mythology — neptune, the roman god of the sea.

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