For ordinary terrestrial experiments, which of the observers below are

1.	For ordinary terrestrial experiments, which of the observers below are inertial and which non-inertial:(a) a child revolving in a "giant wheel",(b) a driver in a sports car moving with a constant high speed of 200 kmh-1 on a straight road.(c) the pilot of an aeroplane which is taking off,(d) a cyclist negotiating a sharp turn,(e) the guard of a train which is slowing down to stop at a station?
Answer» (a) Non-inertial, because the giant wheel has acceleration motion. (b) Inertial frame, because the speed is uniform in a straight line. (c) Non-inertial, because the aeroplane accelerates while taking off. (d) Non-inertial, because the cyclist has now accelerated motion. (e) Non-inertial, because the train is retarding.

For ordinary terrestrial experiments, which of the observers below are inertial and which non-inertial:(a) a child revolving in a "giant wheel",(b) a driver in a sports car moving with a constant high speed of 200 kmh-1 on a straight road.(c) the pilot of an aeroplane which is taking off,(d) a cyclist negotiating a sharp turn,(e) the guard of a train which is slowing down to stop at a station?

Answer»

(a) Non-inertial, because the giant wheel has acceleration motion.

(b) Inertial frame, because the speed is uniform in a straight line.

(d) Non-inertial, because the cyclist has now accelerated motion.

(e) Non-inertial, because the train is retarding.