A spaceship approaches Earth with a speed 0.38c. A passenger in the spaceship measures his heartbeat as 72 beats per minute
How many beats per minute are observed in the telemetry radio signals received on Earth? Note that, in addition to time dilation, one must take into account that the signals of successive heartbeats have to travel shorter distances because the spaceship is moving closer (Doppler Effect). A) 75
B) 107
C) 48
D) 100
E) 67
B
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Of all his laws, Kepler was proudest of the third. Why was it so appealing in his search for cosmic harmony?
What will be an ideal response?
In the U.S., AC line voltage oscillates at a frequency of __________
Fill in the blank(s) with correct word
Events that are simultaneous in one inertial reference frame are simultaneous in all inertial reference frames
Indicate whether the statement is true or false
A piece of glass has a thin film of gasoline floating on it. A beam of light is shining perpendicular on the film
If the wavelength of light incident on the film is 560 nm and the indices of refraction of gasoline and glass are 1.40 and 1.50, respectively, what is the minimum nonzero thickness of the film to see a bright reflection? A) 500 nm B) 400 nm C) 300 nm D) 200 nm E) 100 nm