What is the speed of a pendulum at a given horizontal position and length?

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The discussion revolves around calculating the speed of a pendulum at specific horizontal positions given its length and speed. A pendulum of 0.950 m swings with a speed of 4.80 m/s at angles θ = 90° and θ = 270°. Participants emphasize the importance of significant figures in the solution, noting that the problem does not specify a required number. There is also a concern about the accuracy of the calculated tangential acceleration. The conversation highlights the need for careful calculations while addressing the problem's parameters.
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Homework Statement


An image of the problem may be found here:

http://i417.photobucket.com/albums/pp258/whatsntomake/Physics/Eight.png

A pendulum of length 0.950 m swings in a vertical plane (see figure). When the pendulum is in the two horizontal positions θ = 90° and θ = 270°, its speed is 4.80 m/s.

Homework Equations



A=v^2/r

The Attempt at a Solution

 
Last edited by a moderator:
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whatsntomake said:

Homework Statement


An image of the problem may be found here:

http://i417.photobucket.com/albums/pp258/whatsntomake/Physics/Eight.png

A pendulum of length 0.950 m swings in a vertical plane (see figure). When the pendulum is in the two horizontal positions θ = 90° and θ = 270°, its speed is 4.80 m/s.

Homework Equations



A=v^2/r

The Attempt at a Solution

Welcome to Physics Forums.

Be careful with your significant figures. How many significant figures does the question ask for?
 
Last edited by a moderator:
Hi, thanks for your quick response.
The problem does not specify any significant figure so it fine to any number of significant digits as long as the answer is close by a certain margin of error.

also I am not sure if the tangential acceleration I had is correct
 
Last edited:
whatsntomake said:
Hi, thanks for your quick response.
The problem does not specify any significant figure so it fine to any number of significant digits as long as the answer is close by a certain margin of error.
Okay that's fair enough.
whatsntomake said:
also I am not sure if the tangential acceleration I had is correct
How did you calculate it?
 

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