Final answer:
Safely walk around a vehicle parked parallel to the curb by facing oncoming traffic, and in the bicyclist's reference frame, a stationary person appears to move opposite to the biker's direction of travel.
Step-by-step explanation:
When entering or exiting a vehicle parked parallel to a curb, it is safest to walk around the vehicle in the direction of facing the oncoming traffic. This means that if you are on a road where the traffic runs right to left, you would walk around the back of your vehicle, so you are facing the oncoming cars. This allows you to see the traffic and be visible to drivers, increasing your safety.
Considering the reference frame of a bicyclist, if you are standing on a sidewalk and the bicyclist is passing by to your right, in the bicyclist's reference frame, you would appear to be moving to the left. This is because the bicyclist's forward motion creates the illusion that stationary objects are moving in the opposite direction. This is analogous to the concept of relative motion in physics, where the observed direction and speed of an object depend on the observer's frame of reference.