A fire engine is traveling at a constant speed along a level, straight road. A car has stopped at the side of the road so the fire engine may pass it. Choose all the statements below that are false.


The firemen in the fire engine measure the proper time for the period of the siren on the fire engine.


The firemen in the fire engine measure the proper length of a ladder carried by the fire engine.


Both the driver of the car and the firemen on the fire engine agree on the width of the car.


The firemen on the fire engine measure the proper length of the car.


The driver of the car measures the proper time for the period of the siren on the fire engine.

The firemen in the fire engine measure the proper time for the period of the siren on the fire engine.

SURE, SIREN IS NOT MOVING RELATIVE TO FIREMEN - NO DOPPLER EFFECT

The firemen in the fire engine measure the proper length of a ladder carried by the fire engine.
SURE, NO RELATIVE MOTION

Both the driver of the car and the firemen on the fire engine agree on the width of the car.
YES, NO RELATIVE SPEED IN WIDTH DIRECCTION

The firemen on the fire engine measure the proper length of the car.
NOT IF EINSTEIN SPECIAL RELATIVITY MATTERS, THERE IS RELATIVE MOTION IN AXIAL DIRECTION.

The driver of the car measures the proper time for the period of the siren on the fire engine.
NO WAY, DOPPLER EFFECT, SOUNDS HIGHER APPROACHING, LOWER AFTER PASSING. IF CAR HITS SPEED OF SOUND AFTER PASSING, CAN NOT HEAR IT AT ALL :)