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A bullet spins as the shot is fired from a gun. For this purpose, two helical slots as shown in the figure are cut in the barrel. Projections A and B on the bullet engage in each of the slots.
Helical slots are such that one turn of helix is completed over a distahce of 0.5 m. If velocity of bullet when it exits the barrel is 20 m/s, its spinning speed in rad/s is ______.
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- 255.4 rad/sec
- 251.3 rad/sec
- 252.2 rad/sec
- 241.3 rad/sec
Correct Option: B
| Time taken force revolution = | = 0.025 sec | |
| 20 |
| The spinning speed is | rad/sec = 251.3 rad/sec | |
| 0.02s |
