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Answer on Mechanics | Relativity Question for Melanie

Question #5753
A string under a tension of 43 N is used to whirl a rock in a horizontal circle of radius 3.3 m at a speed of 26.46 m/s. The string is pulled in, and the speed of the rock increases. When the string is 0.635 m long and the speed of the rock is 80.5 m/s, the string breaks. What is the breaking strength of the string? Answer in units of N.
Expert's answer
Let's make the following denominations:

F1 = 43 N
R1 = 3.3 m
V1 = 26.46 m/s
R2 = 0.635 m
V2 = 80.5 m/s
M - the mass of a rock

We need to find the mass of a rock at first.
Using the first case we have that the centripetal acceleration of a rock is
Ac1 = V1²/R1 = 26.46²/3.3 ≈ 212.1611 m/s².
Now let's use the second Newton's law:
F1 = M*Ac1 ==> M = F1/Ac1 = 43/212.1611 = 0.2027 kg.

Now let's find the breaking strength of the string.
Using the second case we have that the centripetal acceleration of a rock is
Ac2 = V2²/R2 = 80.5²/0.635 ≈ 10205.1181 m/s².
So, the breaking strength is
F2 = M*Ac2 = 0.2027*10205.1181 = 2068.5774 N.

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