- #1
Rockdog
- 23
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A 3.2 kg flowerpot drops from a tall building. The initial speed of the pot is zero, and you may neglect air resistance.
a) What is the magnitude of the force acting on the pot while it is in the air 1.5 s after it begins to fall?
b) After the pot has fallen 28 m, what is its speed?
c) After the pot has fallen 28 m, it enters a viscous liquid, which brings it to rest over a distance of 1.5 m. Assuming constant deceleration over this distance, what is the magnitude of this deceleration?
d) What is the force exerted on the liquid by the pot?
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Okay, I got the answers for the first three, which are
1) 31.36 N
2) 23.4 m/s
3) 182 m/s/s
If you really want to know how I did it, I can provide that in a later post, but that's not the point here.
I'm stuck on the last question.
I know I have to use this equation; F=M*a (in the y direction)
Well, I was thinking, the object has a downward force of 31.36 N, so when it hits the liquid, shouldn't the liquid push back up 31.36N? Of course, my answer doesn't match the computer, so insight appreciated.
*31.36N achieved by 3.2kg*9.8m/s/s
a) What is the magnitude of the force acting on the pot while it is in the air 1.5 s after it begins to fall?
b) After the pot has fallen 28 m, what is its speed?
c) After the pot has fallen 28 m, it enters a viscous liquid, which brings it to rest over a distance of 1.5 m. Assuming constant deceleration over this distance, what is the magnitude of this deceleration?
d) What is the force exerted on the liquid by the pot?
-----------------------------------------------------------
Okay, I got the answers for the first three, which are
1) 31.36 N
2) 23.4 m/s
3) 182 m/s/s
If you really want to know how I did it, I can provide that in a later post, but that's not the point here.
I'm stuck on the last question.
I know I have to use this equation; F=M*a (in the y direction)
Well, I was thinking, the object has a downward force of 31.36 N, so when it hits the liquid, shouldn't the liquid push back up 31.36N? Of course, my answer doesn't match the computer, so insight appreciated.
*31.36N achieved by 3.2kg*9.8m/s/s