• Support PF! Buy your school textbooks, materials and every day products Here!

Drops of Water

  • #1
1,235
1
Water drips from the nozzle of a shower onto the stall floor 81 in. below. The drops fall at regular intervals of time, the first drop striking the floor at the instant the fourth drop begins to fall. Find the location of the individual drops when a drop strikes the floor.

So we are given a distance the drop falls 81 inches . When it says to find the location of the individual drops, I need a position function. Should I use [itex] y = v_{y}_{0}t + \frac{1}{2}a_{y}t^{2} [/itex]?

Thanks
 

Answers and Replies

  • #2
StatusX
Homework Helper
2,564
1
Right, but theres no initial velocity. And first you need to find the time each drop starts falling.
 
  • #3
HallsofIvy
Science Advisor
Homework Helper
41,833
955
Or, more correctly, the initial velocity is 0! Calculate the time it takes the first drop to hit the floor. According to the problem, that is exactly the time the fourth drop starts to fall. So, since the drops fall "at regular intervals of time", that "regular intervals of time" is 1/3 the time the first drop takes to hit the floor (do you see why it is 1/3 and not 1/4?). Now you know when each successive drop starts!
 
  • #4
1,235
1
yes thats what i was thinking. its 1/3 and not 1/4, because the first drop hits the ground only when the fourth drop starts to fall, not when it hits the ground.
 

Related Threads on Drops of Water

  • Last Post
Replies
0
Views
1K
  • Last Post
Replies
3
Views
1K
  • Last Post
Replies
2
Views
5K
  • Last Post
Replies
1
Views
6K
  • Last Post
Replies
1
Views
1K
Replies
4
Views
2K
Replies
16
Views
10K
Replies
3
Views
2K
  • Last Post
Replies
5
Views
5K
  • Last Post
Replies
8
Views
2K
Top