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Old Nov 5th 2010, 08:20 PM   #1
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Join Date: Nov 2010
Posts: 1
Time Traveled through a tunnel

Hello my name is Chris I go to NJIT and my professor gave a problem to solve and I am baffled. I thought I had it but, he said no. Any help is greatly appreciated this is very important for my grade. Thank you.

The Question:
There is a tunnel spanning from NY to LA. There is a Train in the tunnel and he wants the time it takes to reach the end and also the velocity it has.
In the picture below i tried to illustrate it. X=5400km and r=6400km.


This is my work i got the equation T = π √ (R/g) from another equation with force+massdensityofearth x G x X x pi x m=0



He gives a multiple choice like answer key
velocity is either:
6000m/s
600m/s
60m/s
6m/s
0m/s

Last edited by idkphysics; Nov 5th 2010 at 08:31 PM.
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