# physics

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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 -

0.28s??

• physics -

no the answer is 1.6 revolutions per second

• physics -

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 -

are you sure we can use length of the string 1m as the radius? and why?

• physics -

Your problem statement says the string is one meter long.

• physics -

hmmm...ok thanks :)

• physics -

Sry, I misunderstand the question. F=3.55

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