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Re: [Phys-l] real-world mechanics problem



OK - I thought A was the amplitude of the motion in meters of arc.

Thanks -

Bob

________________________________________
From: phys-l-bounces@carnot.physics.buffalo.edu [phys-l-bounces@carnot.physics.buffalo.edu] On Behalf Of Bob Sciamanda [treborsci@verizon.net]
Sent: Sunday, February 06, 2011 3:06 PM
To: phys-l@carnot.physics.buffalo.edu
Subject: Re: [Phys-l] real-world mechanics problem

?Bob,

Dimensions:
Xdot => M/sec, but

A*sqrt(g/L) => radians*sqrt [(M/sec^2)/M] =sqrt [1/sec^2] =sec^-1 .

Non e vero?

Perhaps you are confusing Xdot with Omega?!?
Xdot is the linear speed.

-----Original Message-----
From: LaMontagne, Bob
Sent: Sunday, February 06, 2011 2:53 PM
To: Forum for Physics Educators
Subject: Re: [Phys-l] real-world mechanics problem

?? x dot = A * sqrt(g/L) is dimensionally correct. Am I missing something?

Bob at PC

________________________________________
From: phys-l-bounces@carnot.physics.buffalo.edu
[phys-l-bounces@carnot.physics.buffalo.edu] On Behalf Of Bob Sciamanda
[treborsci@verizon.net]
Sent: Sunday, February 06, 2011 9:25 AM
To: phys-l@carnot.physics.buffalo.edu
Subject: Re: [Phys-l] real-world mechanics problem

?Not so!
The equation is a correct small angle approximation.
(Your correction doesn't even pass "dimensions muster".)

-----Original Message-----
From: LaMontagne, Bob
Sent: Sunday, February 06, 2011 8:32 AM
To: Forum for Physics Educators
Subject: Re: [Phys-l] real-world mechanics problem

Appears to be a simple mistyping g*L ---> g/L

Bob at PC

________________________________________
From: phys-l-bounces@carnot.physics.buffalo.edu
[phys-l-bounces@carnot.physics.buffalo.edu] On Behalf Of Bob Sciamanda
[treborsci@verizon.net]
Sent: Saturday, February 05, 2011 1:31 PM
To: phys-l@carnot.physics.buffalo.edu
Subject: Re: [Phys-l] real-world mechanics problem

?But I still don't see what kinematics gave you :

X dot = sqrt.(g*L) A

Please show youir work :-)
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Bob Sciamanda
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http://mysite.verizon.net/res12merh/




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_______________________________________________
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Bob Sciamanda
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_______________________________________________
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