Posted by ridhi on .
an object of mass 0.1kg is rotated in a horizontal circle by a string 1m long. the maximum tension in the string before it breaks is 50N.what is its maximum frequency reached?

physics 
Sinmei,
0.28s??

physics 
ridhi,
no the answer is 1.6 revolutions per second

physics 
Damon,
F = m v^2/r
50 = .1 v^2/1
v^2 = 500
v =10 sqrt 5
circumference = 2 pi r = 2 pi
time around circle = 2 pi /10 sqrt 5
frequency = 1/time = (5/pi) sqrt 5
f = 3.55 
physics 
ridhi,
are you sure we can use length of the string 1m as the radius? and why?

physics 
Damon,
Your problem statement says the string is one meter long.

physics 
ridhi,
hmmm...ok thanks :)

physics 
Sinmei,
Sry, I misunderstand the question. F=3.55