Calculating Revolutions of Mass in a Horizontal Circle

[rachael]

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.

 

[cepheid]

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

 

[phucnv87]

With the datum about $$T$$ you gave, I think there's no need for other data to find the revolutions per minute.[/color]

 

[rachael]

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

 

[cepheid]

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.

 

[rachael]

oh i c, you use T=1/f then times it by 60secs
Thank you for your help