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.

answer: 802.3 kilo joules of energy represents 191.75 kilo calorie of energy.

explanation:

energy released during combustion of one mole methane = 802.3 kilo joules

if 1 kilo joule = 0.239006   kilo calorie

then ,802.3 kilo joule will be = 802.30.239006 kilo calorie

802.3 kilo joule = 191.75 kilo calorie

hence, the energy in kilo calorie is 191.75 kilo calorie.

seeing the graph would