Ambivalent Skeptic

March 6, 2011

Latitude Trivia and Lights in the Sky

Filed under: Science — Clint1911 @ 10:06 pm

Did you know that the northern most point of Ohio is South of the southern most point in mainland France? Both are about 42 degrees latitude.
Ohio’s northern most point is at 42°19′37.59″N latitude.
France’s southern most point is 42°20′N latitude.

Ohio’s southern most point is 38°24′11.76″N latitude. (0°is the equator and 90° is the North Pole)

And one degree is 60 Nautical Miles, or about 69 Statue (normal) miles.

So Ohio is one mile “farther south” that France. (Which is different then being one mile south of France, because we’re not, we’re on the other side of the planet.)

Also because Europe does not run directly east-west like some books imply, Madrid is farther south than Rome.
Madrid is at 40° 24′ 0″ N
While Rome is at Latitude: 41°54′N

Latitudes for some major Ohio cities:
Cleveland 41° 28′
Columbus 40° 00′
Cincinnati 39° 08′

In other words Rome and Cleveland are about the same distance from the north pole.

Why Do I care? Because the Northern Lights (Aurora Borealis) were visible in Rome back in 1958 due to an unusually large Solar Maximum [wiki].

Well I HEARD we were due for an equally large SolarMax in 2011…

But NASA updated their info and now say the Solar Maximum will be in 2013 and be a record low! http://science.nasa.gov/science-news/science-at-nasa/2009/29may_noaaprediction/

How to you screw up a prediction that bad?

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March 4, 2011

Perspective on speed and “standing still”

Filed under: Perspective,Science — Clint1911 @ 10:03 pm

25000 mi / 24 hr = 1041.66… MPH

Earth’s Circumference at the Equator: 24901.55 miles (40075.16 km).

Those roughly 25,000 miles pass by in 24 hours, at a speed of 25000/24 or just over 1000 miles per hour.

Multiply the planet’s circumference by the cosine of your latitude to see how fast the Earth is rotating where you are.

cosine(31 degrees) * (25,000 / 24) = 892.882605
cosine(39 degrees) * (25,000 / 24) = 809.527043
cosine(41 degrees) * (25,000 / 24) = 786.155813
cosine(40 degrees) * (25,000 / 24) = 797.962962
cosine(49 degrees) * (25,000 / 24) = 683.394822

1 MPH = 1.46666… fps
100 MPH = 146.7 fps

So at 41 degrees North, the dirt under my feet is spinning around the Earth’s axis at 1153.029 fps.

That’s fast. That’s faster than most commercial airliners. It’s even faster than many pistol bullets.

Even better….

The Earth is also moving around the Sun at about 67,000 miles per hour.

November 1, 2010

Gun momentum

Filed under: Science — Clint1911 @ 10:14 pm

Momentum = Velocity X Mass

Mass = weight/gravity

Thus

Momentum = velocity X weight/gravity

or

ft/s X lb/gravity

but we measure bullets in grains. So:

lb=7000 grain

gr=grain

g=gram

kg=kilogram

And while I am at it:

one gram = 15.4324 grains

and

One mil=1/1000th of an inch or .001 inches

One mm=millimeter=.001 meters

1 mm = 39.37 mil

1 meter = 39.37 inches

And

Gravity=32.174 Ft

s^2

Back to the equation give us

ft X gr lb / 32.174 Ft

s 7000 gr s^2

Which is equivalent to:

ft X gr lb X 1 s*s

s 7000 gr 32.174 Ft

thus

ft X gr lb X 1 s*s

s 7000 gr 32.174 Ft

Thus the units are “lb-s.”

So velocity (in ft/s) times weight (in grains) divided by 225218.

Using a hot 30-06 load of 150 grains at 3000 ft/s gives

3000 X 150 lb X 1 s = 2 lb-s (rounded from 1.998…)

7000 32.174

Or you could take the power factor (IPSC) and divide by 225 and incorporate the lb-s unit.

150*3000/1000 = 450

450/225 = 2

thus 2 lb-s

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