Published by:
CGP EDU Academic Team
Published on: September 12, 2026
Two identical rings which can slide along the rod are kept near the mid point of a smooth rod of length 2
(
= 1 m) The rod is rotated with constant angular velocity
= 3 radian/ sec about vertical axis passing through its center. The rod is at height h = 5 m from the ground. Find the distance (in meter) between the points on the ground where the rings will fall after leaving the rods
Text Solution
Verified by ExpertsThe correct answer is:
6.0
Step 1: Determine the distance from the center of the rod to the rings. Since the rod is 2 m long, each ring is at a distance of \frac{\ell}{2} = 1 m from the center.
Step 2: Calculate the tangential velocity (v) of each ring at the moment they leave the rod. Using \( v = \omega r \), where \( \omega = 3 \text{ rad/s} \) and \( r = 1 m \), we get \( v = 3 \times 1 = 3 \text{ m/s} \).
Step 3: Determine the time (t) it takes for the rings to fall to the ground. Using the equation for free fall \( h = \frac{1}{2}gt^2 \), where \( h = 5 m \) and \( g \approx 9.8 m/s^2 \), we rearrange to find \( t = \sqrt{\frac{2h}{g}} = \sqrt{\frac{10}{9.8}} \approx 1.01 \text{ seconds} \).
Step 4: Calculate the horizontal distance traveled by the rings before they hit the ground using the formula \( d = vt \). Thus, \( d = 3 \times 1.01 \approx 3.03 m \) for one ring. Since there are two rings, the total distance between the points on the ground where the rings fall is \( 2 \times 3.03 \approx 6.06 m \), rounding to 6.0 m.
Therefore, the distance between the fall points is approximately 6.0 m.
Step 2: Calculate the tangential velocity (v) of each ring at the moment they leave the rod. Using \( v = \omega r \), where \( \omega = 3 \text{ rad/s} \) and \( r = 1 m \), we get \( v = 3 \times 1 = 3 \text{ m/s} \).
Step 3: Determine the time (t) it takes for the rings to fall to the ground. Using the equation for free fall \( h = \frac{1}{2}gt^2 \), where \( h = 5 m \) and \( g \approx 9.8 m/s^2 \), we rearrange to find \( t = \sqrt{\frac{2h}{g}} = \sqrt{\frac{10}{9.8}} \approx 1.01 \text{ seconds} \).
Step 4: Calculate the horizontal distance traveled by the rings before they hit the ground using the formula \( d = vt \). Thus, \( d = 3 \times 1.01 \approx 3.03 m \) for one ring. Since there are two rings, the total distance between the points on the ground where the rings fall is \( 2 \times 3.03 \approx 6.06 m \), rounding to 6.0 m.
Therefore, the distance between the fall points is approximately 6.0 m.
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