# physics 11

Timmy twirls a dead rat (mass = 2 kg) attached to a rusty chain (length = 1m) in a vertical circle. With what
velocity should Timmy rotate the rodent so that the chain just goes slack (no force in the chain) at the top?

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1. ignoring chain weight?

at the top, mg=mv^2/r
v=sqrt (rg)

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👤
bobpursley
2. 3.16m/s

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3. Timmy the angry teen twirls a dead rat (mass = 2 kg) attached to a rusty chain (length = 1m) in a vertical circle. With what
velocity should Timmy rotate the rodent so that the chain just goes slack (no force in the chain) at the top?

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2. 👎
3. ℹ️
4. 🚩
4. 3.16m/s

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5. Yeh

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6. You find velocity from acceleration formula: a=v^2/r
Your acceleration is 9.81 m/s^2 but for this problem round it to 10 m/s^2.
a=v^2/r ==> 10=v^2/1 (Multiply both sides by 1 to get rid of the fraction you end up with:) 10=v^2 (to get rid of the square you square root both, the 10 and v^2) The square root of 10 is 3.16 which is also your answer: 3.16 m/s^2

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