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Forces Question watch

1. Attachment 728446
I don't get how to find the force? I know force as F = ma and I'm not seeing how to define the air's acceleration.
2. Hello! You don't seem to have included the question here.
3. (Original post by EmilySarah00)
Hello! You don't seem to have included the question here.
Frick
4. (Original post by Retsek)
Attachment 728446
I don't get how to find the force? I know force as F = ma and I'm not seeing how to define the air's acceleration.
You need to use resultant force equals to the rate of change of momentum instead of F = ma.
5. (Original post by Eimmanuel)
You need to use resultant force equals to the rate of change of momentum instead of F = ma.
So the force = momentum / time

The problem still stands I don't have a time frame? Or is it to do with the 12ms? Does the velocity go from 0ms to 12ms in one second because in the next second it moves on to the next 12m of air? and then the mass will be the 12m tall cylinder?
6. (Original post by Retsek)
So the force = momentum / time

The problem still stands I don't have a time frame? Or is it to do with the 12ms? Does the velocity go from 0ms to 12ms in one second because in the next second it moves on to the next 12m of air? and then the mass will be the 12m tall cylinder?
The time is in part (i).
7. (Original post by Eimmanuel)
The time is in part (i).
Why do I always forget to read the fricking question....

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