Concept explainers
(a)
To rank:The speeds of the probes as seen by an Earth observer from greatest to least.
(a)
Answer to Problem 17A
The speeds of the probes as seen by an Earth observer from greatest to least is
Explanation of Solution
Given:
The given figure is shown below.
Formula used:
The expression for the speed of the probes as seen by an Earth observer is,
Here,
Calculation:
The speed of the probes as seen by an Earth observer for case A is
The speed of the probes as seen by an Earth observer for case B is,
The speed of the probes as seen by an Earth observer for case C is,
By comparing the speed of the probes as seen by an Earth observer is
Conclusion:
Thus, the speeds of the probes as seen by an Earth observer from greatest to least is
(b)
To rank:The
(b)
Answer to Problem 17A
The speed of light reflected from the departing probes as seen by the spaceship from greatest to least is
Explanation of Solution
Given:
The given figure is shown below.
Formula used:
As per the “second postulate of
Calculation:
The speed of light is constant regardless of the speed of flashlight. It is same in all the reference frames.An observer on the spaceship will measure the speed of light as c .The speed of the flashes will not be different even if the spaceship turns around or stops.Hence, the speed of light which is reflected from the “departing probes” as observed by the spaceship from highest to least is
Conclusion:
Thus, the speed of light reflected from the departing probes is
Chapter 15 Solutions
Conceptual Physics: The High School Physics Program
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