Three screens are placed exactly one behind the other. The light of the torch falls on all the three screens. One of the screen
1 answer:
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Answer:
0.32 s
Explanation:
Initial angular speed:
Final angular speed:
Angular rotation:
The angular acceleration of the drill can be found by using the equation:
Re-arranging it, we find , the angular acceleration:
Now we want to know the time t the drill takes to accelerate from
to
This can be found by using the equation
where is the angular acceleration we found previously. Solving for t,