In Their Common Rest Frame, Two Stars Are 90

question 7

Multiple Choice

In their common rest frame, two stars are 90.0 light-years (ly) apart. If they are 12.0 ly apart as measured by the navigator in a spaceship traveling between them, how fast is the spaceship moving? Express your answer in terms of c.

• A) 0.991c
• B) 0.986c
• C) 0.980c
• D) 0.972c

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Definitions:

Family

A social unit consisting of parents and their children, considered as a group, whether dwelling together or not; also refers to people who may or may not be related by blood or marriage but share close bonds.

Sports Team

A group of individuals who come together to participate in a competitive sport, sharing common goals, training, and strategies to win games or matches.

Social Cohesion

The extent to which members of a society or group stick together and remain united in pursuit of common goals and interests.

Task Cohesion

The extent to which members of a group work together effectively to achieve shared objectives.