|
4 articles trouvés pour ce sujet.
 |
|
|
|
|
|
|
|
|
A railroad embankment |
2013-01-22 |
|
clint pose la question :
the pennsylvania railroad found it necessary,owing to land slides upon the roadbed,to reduce the angle of inclination of one bank of certain railway cut near pittsburgh,pa.,from an original angle of 45 degrees to a new angle of 30 degrees. the bank as it originally stood was 200 ft.long and had a slant length of 60 ft.. find the amount of the earth removed, if the top level of the bank remained unchanged.
Penny Nom lui répond. |
|
|
|
|
|
|
How many miles of track? |
2008-08-27 |
|
Stephanie pose la question :
I have a 50 ac tract of Railroad I need to know approx how many miles of tr=
ack would be included in 50 ac
Penny Nom lui répond. |
|
|
|
|
|
|
Chord, radius, arc length and central angle |
2008-04-15 |
|
Cindy pose la question :
There is a railroad curve with a chord length of 2000 ft. and a central angle of 35 degrees. What is the radius and arc length of the circular arc?
Stephen La Rocque lui répond. |
|
|
|
|
|
|
The coefficient of thermal expansion for steel |
2005-10-14 |
|
Jim pose la question :
Is the following statement true?
“The coefficient of thermal expansion for steel is 0.00000645in/in/deg. Doesn't sound like much but when you run out the numbers it comes to .405504 ft/mile/deg. Still doesn't sound like much, only about 5". Then multiply by 40 degrees and you get a piece of rail that has grown by 16.22 feet in that one mile. It's not at all unusual for the rail temp to go from say, 40 deg to 80 deg on a spring or fall day. Remember that on a sunny day, the rail temp can be significantly higher than the air temp as well."
I ran the math and came up with an answer closer to 16 inches, instead of 16 feet. Which is closer to being correct?
Penny Nom lui répond. |
|
|
|
