Which is not a component of a frame of reference?

a. an observer

b. a odometer

c. a timer

d. a coordinate system

Also called reference frame. Physics. a framework that is used for the observation and mathematical description of physical phenomena and the formulation of physical laws, usually consisting of an observer, a coordinate system, and a clock or clocks assigning times at positions with respect to the coordinate system.

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B. Odometer

Explanation:

Option B is correct

A frame of reference is a framework where we measure the changes in position of an object be it displacement, Velocity or acceleration over a period of time as observed by an observer.  So, all we need is an observer, a coordinate system ( for directional reference) and a timer.

Here, an odometer is not a part of the frame of reference, because irrespective of the frame, the odometer will always measure the same distance.

explanation: magnetic pole, region at each end of a magnet where the external magnetic field is strongest. the south-seeking pole, or any pole similar to it, is called a south magnetic pole. unlike poles of different magnets attract each other; like poles repel each other.

a. are