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Author Question: A 30-year-old woman takes a trip on a rocket, leaving her 20-year-old brother behind. She travels at ... (Read 253 times)

Marty

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on: Jul 28, 2018
A 30-year-old woman takes a trip on a rocket, leaving her 20-year-old brother behind. She travels at a speed of 0.8 c, and is gone 20 years, according to the younger brother. When she returns, how many years older/younger is she than her brother?
 a. 2 years younger
  b. 2 years older
  c. 3 years older
  d. 10 years older
  e. 8 years older

Question 2

A spaceship moving past the Earth with a speed of 0.800 c signals to the Earth with pulsed laser photons emitted at 10.0-second intervals according to the spaceship's clock. According to observers on Earth who see the flashes, the time interval they measure is
 a. 13.4 s
  b. 16.7 s
  c. 12.5 s
  d. 9.70 s
  e. 6.03 s


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cam1229

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Reply #1 on: Jul 28, 2018
Answer to Question 1

B

Answer to Question 2

B


Marty

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Reply 2 on: Jul 28, 2018
Gracias!

Joy Chen

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Reply 3 on: Yesterday
Wow, this really help

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