A spaceship is going away from Earth with a speed 0.28c. 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 longer distances because the spaceship is moving away (Doppler Effect). A) 75
B) 96
C) 54
D) 69
E) 100
C
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Resistors in Combination: What resistance must be connected in parallel with a 633-? resistor to produce an equivalent resistance of 205 ??
Fill in the blank(s) with the appropriate word(s).
Which of the following is a technique used by astronomers in their search for other planetary systems?
a. Observation of the star's rotation only b. Observation of the Doppler shifts in the star's spectrum only c. Both (A) and (B) d. The search for alien signals
An electric current can consist of
a. positive ions flowing in a liquid c. electrons flowing in a wire b. negative ions flowing in a liquid d. all of the above
The symbol indicating the mass number of a nucleus is __________
Fill in the blank(s) with correct word