19.An astronaut traveling with a speed v = 0.90c holds a meterstick in his hand. If he measures its
問題詳情
19.tAn astronaut traveling with a speed v = 0.90c holds a meterstick in his hand. If he measures its length, he will obtain a value of (A) 1.0 m, (B) 2.5 m, (C) 0.10 m, (D) 0.50 m, (E) 3.80 m.