In a Test of Equipment the Following Procedure Is Carried

question 27

Multiple Choice

In a test of equipment the following procedure is carried out.Spacecraft №1 is traveling at 0.75c and fires a laser pulse in the forward direction at Spacecraft №2,which is testing its device that measures the speed of laser pulses as they pass by the spacecraft.Spacecraft №2 is traveling at 0.95c in a direction away from Spacecraft №1.The device is working properly,and the speed of the pulse as it passes is successfully measured.What is the speed of the laser pulse measured in this case?

• A)0.80c
• B)0.70c
• C)c
• D)This is a question that cannot be answered without knowing in which reference frames the speeds given in the problem.If you agree,then this is the answer that you should choose.

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Definitions:

Wrong Word

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