Final answer:
Water flows steadily through the box. The average velocity at all ports is 7 m/s. The missing information is the direction of the water.
The correct answer is option (d). Direction
Step-by-step explanation:
The missing information in the scenario of water flowing steadily through a box with an average velocity of 7 m/s at all ports is the direction. While the average velocity is given, the specific direction of the water flow is crucial for a comprehensive understanding of the fluid dynamics. Direction indicates the vector nature of velocity, essential for calculating the complete flow characteristics, including factors like momentum and energy transfer. Therefore, option d) Direction is the missing information necessary to fully describe the water flow in the given scenario.
Thus, the correct answer is option (d). Direction