Physics Help Forum Time Traveled through a tunnel
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 Nov 5th 2010, 08:20 PM #1 Junior Member   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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