Question

A spaceship travels with a speed of 0.3 c as it passes by the Earth on its way to a distant star, as shown in the diagram below. The pilot of the spaceship measures the length of the moving ship as 40 m. 0.3 c Earth Determine its length as measured by a person on Earth.

(part 2 of 3) The pilot of the spaceship observes that the spaceship travels for 4 years. Determine how much time has passed according to a person on Earth. Answer in units of years.

(part 3 of 3) Some time after passing the Earth, the pilot shoots a laser pulse backward at a speed of 3 × 108 m/s with respect to the spaceship. Determine the speed of the laser pulse as measured by a person on Earth. Answer in units of m/s.

Answer 1

sal? In rest speed of space craft - 0.30 frause one in pilot frame length of space croft lo=you. length measured in earth's frame e 10-032 the = 38. 167m. of travel frame uomx I - 0.09 - 40mx 1.91 in the time in nest frome to 4yrs. the time of travel uyns += 4.2 yous. 51-0% S.at measured is earth's from the postelates of special theory Relativity, we Know contant speed of light ( 3x10 m remespective of frame of reference. There the speed e anth's krome laser peerse as measured my - 3x10 ms. 111 مما