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CGP EDU Academic Team
Published on: September 13, 2026
A pipe is set in the bottom of a vessel containing water so that it can rotate freely about its own axis. Two nozzles are soldered to the upper end of the pipe and bent as shown in Fig. The whole system is a sort of inverted Segner's wheel. What will happen to the pipe when water flows out of the vessel through the pipe?

Text Solution
Verified by ExpertsThe correct answer is:
A
Step 1: Consider the principle of angular momentum. As water flows out of the nozzles at an angle, it will apply a force on the pipe due to Newton's third law (action-reaction).
Step 2: The outflowing water will generate a torque on the pipe that will cause it to rotate.
Step 3: Since the system resembles a Segner's wheel, the flow of water out of the nozzles creates a rotational motion.
Therefore, the pipe will rotate in the opposite direction to the flow of water.
Step 2: The outflowing water will generate a torque on the pipe that will cause it to rotate.
Step 3: Since the system resembles a Segner's wheel, the flow of water out of the nozzles creates a rotational motion.
Therefore, the pipe will rotate in the opposite direction to the flow of water.
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