A muon travels 60 km through the atmosphere at a speed of 0.9996 c. ་ Part A According to the muon, how thick is the atmosphere? ΕΧΕΙ ΑΣΦ VAΣ L= 1.2 Submit Previous Answers Request Answer ? × Incorrect; Try Again; 5 attempts remaining Provide Feedback km Review

(a) All but the closest galaxies are receding from our own Milky Way Galaxy. If a galaxy 12.0109ly ly away is receding from us at 0. 0.900c, at what velocity relative to us must we send an exploratory probe to approach the other galaxy at 0.990c, as measured from that galaxy? (b) How long will it take the probe to reach the other galaxy as measured from the Earth? You may assume that the velocity of the other galaxy remains constant. (c) How long will it then take for a radio signal to be beamed back? (All of this is possible in principle, but not practical.)

Can classical physics be used to accurately describe a satellite moving at a speed of 7500 m/s? Explain why or why not.

(a) How long would the mum] in Example 5.3 have lived as observed on Earth if its velocity was. 0.0500c? (b) How far would it have traveled as observed on Earth? (c) What distance is this in the muon’s frame?