From a stationary position, I observe a moving boxcar, which has a mirror along the front wall, but it is open at the back of the boxcar. I send a flash of light from my flashlight and time the flash of light as it goes to the front of the boxcar and returns to the back of the boxcar. A passenger in the boxcar also times the round trip of the flash of light. Compare the times recorded on our watches.
a. The time recorded on the two watches is the same.
b. The time recorded on his watch is shorter.
c. The time recorded on his watch is longer.
d. The answer depends on the reference system you are in.
Question 2
The astronaut whose heart rate on Earth is 60 beats/min increases his velocity to v = 0.60c. Now what is his heart rate as measured by an Earth observer?
a. 100 beats/min
c. 36 beats/min
b. 75 beats/min
d. 48 beats/min
Red squirrel Front view, Gatineau Park, Quebec
An octopus moving between tide pools during low tide
The supine position.
Polyps and polyposis. A polyp is a protruding growth from a mucous membrane lining a hollow organ. I
Geographic Position