Calculating Revolutions of Mass in a Horizontal Circle

AI Thread Summary
To calculate the number of revolutions made by a 4.0 kg mass in a horizontal circle with a radius of 0.40 m and a tension of 80 N, the key is to determine the period of the motion. The period (T) represents the time for one complete revolution, which can be used to find the frequency (f) of revolutions per second. By applying the formula T = 1/f and converting the frequency to revolutions per minute, the solution can be derived. The discussion emphasizes the importance of understanding the relationship between period and frequency for solving the problem. This approach allows for an accurate calculation of the number of revolutions per minute.
rachael
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An object of mass 4.0 kg is whirled in a horizontal circle
of radius 0.40 m with a constant speed. If the tension in
the wire is 80 N, a=20 m/s, v= 2.83m/s, T= 0.89 s find:
d the number of revolutions made every minute.
 
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What have you done on this question so far? Have you attempted it?

Please read here, (this is sticky at the top of this section), thanks:

https://www.physicsforums.com/showthread.php?t=94379
 
With the datum about T you gave, I think there's no need for other data to find the revolutions per minute.[/color]
 
yes i have attemted the questions from part a,b,c
but i can't figure what formulae to use to find the number of revolution
 
rachael said:
yes i have attemted the questions from part a,b,c
but i can't figure what formulae to use to find the number of revolution

k, but did you read what phuncv87, or whatever...:p said?

You have the period? What is that? The period of time required for one full revolution to occur. If you know that, can you tell me how often a revolution occurs in one second? What is that? The frequency. Yeah you can, because you know the amount of time needed for one revolution (period), and that's a simple relationship. Give it a shot and let us know how it goes. :smile:
 
oh i c, you use T=1/f then times it by 60secs
Thank you for your help
 
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