Which of the following quantities will two observers always measure to be the same, regardless of the relative velocity between the observers? a. The speed of light in a vacuum. b. The time interval between two events. c. The length of an object. d. The relative speed between the source of motion.
Displacement, Velocity and Acceleration
In classical mechanics, kinematics deals with the motion of a particle. It deals only with the position, velocity, acceleration, and displacement of a particle. It has no concern about the source of motion.
Linear Displacement
The term "displacement" refers to when something shifts away from its original "location," and "linear" refers to a straight line. As a result, “Linear Displacement” can be described as the movement of an object in a straight line along a single axis, for example, from side to side or up and down. Non-contact sensors such as LVDTs and other linear location sensors can calculate linear displacement. Non-contact sensors such as LVDTs and other linear location sensors can calculate linear displacement. Linear displacement is usually measured in millimeters or inches and may be positive or negative.
21. Which of the following quantities will two observers always measure to be the same, regardless of the relative velocity between the observers?
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