Please help me this is the last problem i have left. I am struggling with b and c An electron with a total energy of 19GeV travels through an accelerator tube with proper length 7.7km.

a) What is the length of the tube in the electron's frame? Le=

m

b) How long does it take in the frame of the electron? te=

s

c) How long does it take in the frame of the tube? tt=

s

Note: the rest energy of an electron is: E0=0.51MeV.

its c i just checked it

jupiter is the largest planet in our solar system, having a mass and radius that are respectively, 318 and 11.2 times that of earth. suppose that an object falls from rest near the surface of each planet and that the acceleration due to gravity remains constant during the fall. each object falls the same distance before striking the ground. determine the ratio of the time of fall on jupiter to that on earth.