Road Runner Posted June 10, 2019 Share #1 Posted June 10, 2019 1 Link to comment Share on other sites More sharing options...
jsharr ★ Posted June 10, 2019 Share #2 Posted June 10, 2019 NAILED IT!!!! I always wondered how those things moved. Knew it could not be gasoline engines underground. Now I know! 1 Link to comment Share on other sites More sharing options...
MickinMD ★ Posted June 10, 2019 Share #3 Posted June 10, 2019 3 hours ago, jsharr said: NAILED IT!!!! I always wondered how those things moved. Knew it could not be gasoline engines underground. Now I know! I don't know how much energy is needed to move the train out of the station since it goes downhill, though clearly it's fairly level in the station. My uncle, a civil engineer, helped lay out the first lines of the Washington, D.C. subway system. He told me each station was positioned at a higher point than the approaching and departing tracks so that you can store potential energy as the train comes into the station instead of degrading all of it to heat with brakes. Then you change that stored, potential energy to kinetic (motion) energy as the train goes downhill out of the station. 1 1 Link to comment Share on other sites More sharing options...
TrentonMakes Posted June 10, 2019 Share #4 Posted June 10, 2019 1 minute ago, MickinMD said: My uncle, a civil engineer, helped lay out the first lines of the Washington, D.C. subway system. He told me each station was positioned at a higher point than the approaching and departing tracks so that you can store potential energy as the train comes into the station instead of degrading all of it to heat with brakes. Then you change that stored, potential energy to kinetic (motion) energy as the train goes downhill out of the station. We are cyclists! How would potential and kinetic energy ever be useful to us?! 2 1 Link to comment Share on other sites More sharing options...
Ralphie ★ Posted June 12, 2019 Share #5 Posted June 12, 2019 That was dumb! 1 1 1 Link to comment Share on other sites More sharing options...
maddmaxx ★ Posted June 12, 2019 Share #6 Posted June 12, 2019 You both get a like. It was funny and it was dumb. 1 Link to comment Share on other sites More sharing options...
Ralphie ★ Posted June 12, 2019 Share #7 Posted June 12, 2019 1 hour ago, maddmaxx said: You both get a like. It was funny and it was dumb. My point is rr doesn’t like dumb and dumber. ? 1 Link to comment Share on other sites More sharing options...
Road Runner Posted June 13, 2019 Author Share #8 Posted June 13, 2019 20 hours ago, RalphWaldoMooseworth said: My point is rr doesn’t like dumb and dumber. ? Performing a task that is vital to the commuters in large cities is far from dumb. 1 Link to comment Share on other sites More sharing options...
Recommended Posts
Create an account or sign in to comment
You need to be a member in order to leave a comment
Create an account
Sign up for a new account in our community. It's easy!
Register a new accountSign in
Already have an account? Sign in here.
Sign In Now