Physics Experts?
-
Hey all, I got stuck at this physics question. Looking for help. It's kinda hard, well for me at least. A stone is dropped into a well. The sound of the splash is heard 3.0s later. What is the depth of the well ? (Assume the speed of sound is 340m/s). When the rock drops, it goes uniform acceleration but when you hear the sound, it is uniform motion...That's the hard thing about the question. Too many unknowns for both equation. Am i missing something here? Thanks in advance
Since it is a linear acceleration of the stone the time until the sound is heard would be: T = (T_1 + T_2 =) L/v_s + sqrt( (2*L)/g ) [edited] where T Time v_s Velocity of sound g Acceleration (about 9.8 m/s^2) L Depth of well It is the sum of T_1 = L/v_s : The time it takes for sound to travel the distance L (constant velocity) L = (g * T_2^2)/2 : Linear acceleration of the stone, L being the depth of the well (assuming 0 initial velocity) Hope this is the correct answer (it's been a long time since I did physics) /moliate
The corners of my eyes catch hasty, bloodless motion - a mouse? Well, certainly a peripheral of some kind.
Neil Gaiman - Cold Colours
-
Since it is a linear acceleration of the stone the time until the sound is heard would be: T = (T_1 + T_2 =) L/v_s + sqrt( (2*L)/g ) [edited] where T Time v_s Velocity of sound g Acceleration (about 9.8 m/s^2) L Depth of well It is the sum of T_1 = L/v_s : The time it takes for sound to travel the distance L (constant velocity) L = (g * T_2^2)/2 : Linear acceleration of the stone, L being the depth of the well (assuming 0 initial velocity) Hope this is the correct answer (it's been a long time since I did physics) /moliate
The corners of my eyes catch hasty, bloodless motion - a mouse? Well, certainly a peripheral of some kind.
Neil Gaiman - Cold Colours
It looks right to me. :) -- Shine, enlighten me - shine Shine, awaken me - shine Shine for all your suffering - shine
-
Since it is a linear acceleration of the stone the time until the sound is heard would be: T = (T_1 + T_2 =) L/v_s + sqrt( (2*L)/g ) [edited] where T Time v_s Velocity of sound g Acceleration (about 9.8 m/s^2) L Depth of well It is the sum of T_1 = L/v_s : The time it takes for sound to travel the distance L (constant velocity) L = (g * T_2^2)/2 : Linear acceleration of the stone, L being the depth of the well (assuming 0 initial velocity) Hope this is the correct answer (it's been a long time since I did physics) /moliate
The corners of my eyes catch hasty, bloodless motion - a mouse? Well, certainly a peripheral of some kind.
Neil Gaiman - Cold Colours
Remember that the time is split, 3 seconds is the total time for the sound to reach the top of the well. Plus, the stone is not falling when the sound is heared, there will be a time between the stone hitting the bottom and the sound reaching the top.
"How long has the "Quote Selected Text" been around???"
- Marc Clifton, Lounge 4 Mar '03
"But a fresh install - it's like having clean sheets"
- Chris Maunder Lounge 3 Mar '03
Jonathan 'nonny' Newman
Web Designer, Programmer, Lover, Visionary Leader... Homepage [www.nonny.com] [^] -
Remember that the time is split, 3 seconds is the total time for the sound to reach the top of the well. Plus, the stone is not falling when the sound is heared, there will be a time between the stone hitting the bottom and the sound reaching the top.
"How long has the "Quote Selected Text" been around???"
- Marc Clifton, Lounge 4 Mar '03
"But a fresh install - it's like having clean sheets"
- Chris Maunder Lounge 3 Mar '03
Jonathan 'nonny' Newman
Web Designer, Programmer, Lover, Visionary Leader... Homepage [www.nonny.com] [^]Jonny Newman wrote: Remember that the time is split, 3 seconds is the total time for the sound to reach the top of the well. That's included in the formula. One part for constant velocity and one for constant acceleration. /moliate
The corners of my eyes catch hasty, bloodless motion - a mouse? Well, certainly a peripheral of some kind.
Neil Gaiman - Cold Colours
-
Jonny Newman wrote: Remember that the time is split, 3 seconds is the total time for the sound to reach the top of the well. That's included in the formula. One part for constant velocity and one for constant acceleration. /moliate
The corners of my eyes catch hasty, bloodless motion - a mouse? Well, certainly a peripheral of some kind.
Neil Gaiman - Cold Colours
It looks in the formulas that you have used T in both parts. Are you saying T is equal to 3seconds? If so, then this is not right, there is going to be a time for the stone to drop, and another time for the sound to reach the top.
"How long has the "Quote Selected Text" been around???"
- Marc Clifton, Lounge 4 Mar '03
"But a fresh install - it's like having clean sheets"
- Chris Maunder Lounge 3 Mar '03
Jonathan 'nonny' Newman
Web Designer, Programmer, Lover, Visionary Leader... Homepage [www.nonny.com] [^] -
It looks in the formulas that you have used T in both parts. Are you saying T is equal to 3seconds? If so, then this is not right, there is going to be a time for the stone to drop, and another time for the sound to reach the top.
"How long has the "Quote Selected Text" been around???"
- Marc Clifton, Lounge 4 Mar '03
"But a fresh install - it's like having clean sheets"
- Chris Maunder Lounge 3 Mar '03
Jonathan 'nonny' Newman
Web Designer, Programmer, Lover, Visionary Leader... Homepage [www.nonny.com] [^]Sorry. The formula at the top is the one I meant. The ones at the bottom are just generic expressions for calculating distance travelled with constant velocity/acceleration... I'll give the answer a better formatting. /moliate
The corners of my eyes catch hasty, bloodless motion - a mouse? Well, certainly a peripheral of some kind.
Neil Gaiman - Cold Colours
-
Hey all, I got stuck at this physics question. Looking for help. It's kinda hard, well for me at least. A stone is dropped into a well. The sound of the splash is heard 3.0s later. What is the depth of the well ? (Assume the speed of sound is 340m/s). When the rock drops, it goes uniform acceleration but when you hear the sound, it is uniform motion...That's the hard thing about the question. Too many unknowns for both equation. Am i missing something here? Thanks in advance
-
-
I just wanted to see if I can still think after being sucked into the workforce for the last 2 years... :~ I do have a life, I promise! :rolleyes: - Nitron
"Those that say a task is impossible shouldn't interrupt the ones who are doing it." - Chinese Proverb
-
I just wanted to see if I can still think after being sucked into the workforce for the last 2 years... :~ I do have a life, I promise! :rolleyes: - Nitron
"Those that say a task is impossible shouldn't interrupt the ones who are doing it." - Chinese Proverb
-
Looks like a better/quicker version of your's. I may have to try my Physics master on this one. He always likes a challenge.
"How long has the "Quote Selected Text" been around???"
- Marc Clifton, Lounge 4 Mar '03
"But a fresh install - it's like having clean sheets"
- Chris Maunder Lounge 3 Mar '03
Jonathan 'nonny' Newman
Web Designer, Programmer, Lover, Visionary Leader... Homepage [www.nonny.com] [^] -
Mass of the stone? Neglagable air resistance?
"How long has the "Quote Selected Text" been around???"
- Marc Clifton, Lounge 4 Mar '03
"But a fresh install - it's like having clean sheets"
- Chris Maunder Lounge 3 Mar '03
Jonathan 'nonny' Newman
Web Designer, Programmer, Lover, Visionary Leader... Homepage [www.nonny.com] [^]Jonny Newman wrote: Mass of the stone? :laugh::laugh::laugh::laugh::laugh::laugh::laugh::laugh::laugh::laugh::laugh::laugh::laugh::laugh: er, sorry.....:-O It is ok for women not to like sports, so long as they nod in the right places and bring beers at the right times.
Paul Watson, on Sports - 2/10/2003 -
Hey all, I got stuck at this physics question. Looking for help. It's kinda hard, well for me at least. A stone is dropped into a well. The sound of the splash is heard 3.0s later. What is the depth of the well ? (Assume the speed of sound is 340m/s). When the rock drops, it goes uniform acceleration but when you hear the sound, it is uniform motion...That's the hard thing about the question. Too many unknowns for both equation. Am i missing something here? Thanks in advance
-
Don't forget to take into account the kittens tied up in the sack causing air resistance on the stone. :~ :laugh:
"How many more people have to die before no one ever dies again?" - Daniel Haley, The Onion
-
Don't forget to take into account the kittens tied up in the sack causing air resistance on the stone. :~ :laugh:
"How many more people have to die before no one ever dies again?" - Daniel Haley, The Onion
Please think of the kittens.:-D Brad Jennings "if the golden arches shut shop, where else are the VB people going to get work." - Colin Davies
-
Jonny Newman wrote: Mass of the stone? :laugh::laugh::laugh::laugh::laugh::laugh::laugh::laugh::laugh::laugh::laugh::laugh::laugh::laugh: er, sorry.....:-O It is ok for women not to like sports, so long as they nod in the right places and bring beers at the right times.
Paul Watson, on Sports - 2/10/2003Yeah yeah, i know, my physics master would have shot me. I've been revising 'motion' for my physics AS exam, F=dp/dt is running through my brain too much when I should be thinking of the motion equations. Damn me,damn me.....i realised soon after posting that that the mass is not needed.
"How long has the "Quote Selected Text" been around???"
- Marc Clifton, Lounge 4 Mar '03
"But a fresh install - it's like having clean sheets"
- Chris Maunder Lounge 3 Mar '03
Jonathan 'nonny' Newman
Web Designer, Programmer, Lover, Visionary Leader... Homepage [www.nonny.com] [^]
