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For ordinary terrestrial experiments, wh...

For ordinary terrestrial experiments, which of the observer below are inertial and which are non-inertical ? (a) a child revolving in a giant wheel. (b) driver in a sports car moving with a constant high speed of `200 km//h` on a straight road. ( c) the pilot of an aeroplane which is taking off. (d) a cyclist train which is slowing sown to stop at a station.

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An inertial observer is one which is unacclerated (i. e. a=0 )`. A non inertial observer is an accelerated onserver. On this basis, we find that
(a) a child revoving in a giant wheel is a non-inertial observer.
(b) a driver with a constant speed is an inertial onserver.
(c ) at taken off, aeroplane has an acceleration. Therefore the pilot is a non-inertial onserver.
(d) a cyclist negotiating a sharp turn has an acceleration. Therfore he is a non-inertial onserver.
(e) the guard of the train is a non-inertial onserver, as the train in this case has retardation.
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