Final answer:
Without additional information, it is not possible to determine the length of vector Vz. The length of a vector is typically calculated using geometric or trigonometric methods, depending on the given components or angles, but the question does not provide the necessary details to perform such a calculation.
Step-by-step explanation:
To calculate the length of vector Vz, we need additional context or information that is not provided in the question. Typically, the length or magnitude of a vector in physics or mathematics can be determined using the Pythagorean theorem if the vector components are known, or by applying trigonometric functions if the vector's angle and one of the components are known.
However, using the provided reference information, if we assume that the vector Vz represents a physical quantity such as displacement, velocity, acceleration, etc., we can attempt to calculate its length if we had the appropriate formula or context. For example, one reference mentions using an equation (Equation 21.3) to calculate the distance, which could imply finding the magnitude of a displacement vector. But without the specific details or numerical context, we cannot provide a definite answer to the length of Vz.
It is important to identify the unit for physical quantities correctly. For example, the world record in the 100 m dash is measured in seconds (s) for time, the pole vault in meters (m) for length, a football field's length would be in yards (yd) or meters (m), and the volume of a car's gas tank would be in liters (L) or gallons (gal).