1. Two observers are observing a process or an object.[K/U -2]

a. Does the process seem to take longer for an observer moving relative to a process,or for an observer at rest with respect to the process?

b. Which observer measures the proper time of the process (the observer movingrelative to a process, or for an observer at rest with respect to the process)?

c. Which observer measures the shorter length of a moving object (the observermoving relative to a process, or for an observer at rest with respect to theprocess)?

d. What is rest mass of an object?

e. Which observer measures the rest mass of a moving object (the observer movingrelative to the object, or an observer at rest with respect to the object)?