Mechanics Question Help!
A salmon moving upstream to its breeding grounds jumps a waterfall 2.5m high. With what minimum speed must it leave the water below to reach the top level?
Original post by Student 977
A salmon moving upstream to its breeding grounds jumps a waterfall 2.5m high. With what minimum speed must it leave the water below to reach the top level?
Think about the energy in the system.
What GPE will it have at 2.5m?
Convert this to another form of energy, assuming energy is conserved, to find the speed required.
You can do this with equations of motion
S-what vertical displacement will the Salmon have?
U-the variable we're solving for
V-what minimum velocity must the Salmon have at a displacement of S?
A-what is causing the Salmon to accelerate?
t- not required for this question, but you could work it out.
Pick an appropriate equation, substitute in values, solve for u.
S-what vertical displacement will the Salmon have?
U-the variable we're solving for
V-what minimum velocity must the Salmon have at a displacement of S?
A-what is causing the Salmon to accelerate?
t- not required for this question, but you could work it out.
Pick an appropriate equation, substitute in values, solve for u.
S-2.5m
U-?
V-
A-9.81ms-2
T-X
But what would be the value of v?
U-?
V-
A-9.81ms-2
T-X
But what would be the value of v?
I have got it. Thanks for your help!
Original post by Student 977
A salmon moving upstream to its breeding grounds jumps a waterfall 2.5m high. With what minimum speed must it leave the water below to reach the top level?
√50
Original post by ravitharshan
√50
Welcome to TSR physics.
Posting this is not going to help the original poster as he has already posted that he has worked out the answer, and the thread is 3 days old.
We understand that you want to help, but, if you wish to give effective help you need to help the poster to solve the problem himself.
Thank you.
Stonebridge
Forum Helper
Quick Reply
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