Question

HELP!!!! I have been posting this all day and haven't received any help. This is due in half an hour.
A semicircular plate with diameter d=10 feet is submerged vertically in water (base side down) until the top of the plate is submerged to a depth of h=3 feet. Find the force due to fluid pressure on the plate.
I have also placed an image of the situation in the box below this after you open the question

Answer 1

so.
PRESSURE = p = w * h

Answer 2

The pressure on an object at depth (h) in a liquid is where (w) is the weight‐density of the liquid per unit of volume.

Answer 3

YES?

Answer 4

NO?

Answer 5

that sounds right

Answer 6

so density in this case would be 62.5

Answer 7

you can use F=V*rho*g. doesnt that give the answer?

Answer 8

Yes, I just haven't been able to set it up correctly

Answer 9

ok lets see. whats the volume of a semicircular sphere?

Answer 10

(1/2)(4/3)pir^3 I think

Answer 11

wait. this question will require integration.

Answer 12

fine with you?

Answer 13

okay. how do we set it up?

Answer 14

let me draw. give me a couple of minutes.

Answer 15

hmm. i am confused. sorry.

Answer 16

i'll try it again. get back to you in some time. i dont think i'll be able do meet the 30min deadline.

Answer 17

thats alright if you don't meet the deadline. I would rather understand how to do the problem.

Answer 18

can you give me the answer?

Answer 19

@Mashy he can help you.

Answer 20

is this a flat plate or a hemisphere? :O

Answer 21

Also shouldn't they be mentioning the density of the fluid ?

Answer 22

we know the density of water. :P

Answer 23

oh its water :D.. sorry.. and its a plate right?.. why did you ask volume them? :O

Answer 24

i dont know. i was confused. :P

Answer 25

hmmm anyways.. the net force = weight of water displaced..

Answer 26

but since its a flat plate.. how do we get volume? :D

Answer 27

i have no idea. i'm leaving at for the moment. :P

Answer 28

why did you get the medal? :D

Answer 29

for writing F=V.rho.g :P