Pendulum question please help (1 Viewer)

[Elise8842]

Could anyone show me how to do part c? Thanks a lot~


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[Elise8842]

That's what I've done so far... I assumed T1>T2 (not sure if that's correct though, can't think of other inequality ) , but the result is still ...wrong


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[dunjaaa]

For part (c), you have to find the condition for the circular motion to exist. We set T2 > 0 and solve because T1 is always > 0 since r, w, g and m > 0 and also since 0 < θ < 90 (i.e. acute angle) -> implying sinθ and cosθ > 0. As for (d), think about when P is fixed (Hint: Consider the tensions (T1 & T2))

 

[Elise8842]

For part (c), you have to find the condition for the circular motion to exist. We set T2 > 0 and solve because T1 is always > 0 since r, w, g and m > 0 and also since 0 < θ < 90 (i.e. acute angle) -> implying sinθ and cosθ > 0. As for (d), think about when P is fixed (Hint: Consider the tensions (T1 & T2))

Thanks dunjaaa, but why is T2>0 the condition for the circular motion to exist?


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[faisalabdul16]

All tensions must be taut so > 0

 

[Elise8842]

All tensions must be taut so > 0

Ohhh thanks


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[dunjaaa]

Yeah, all strings must be taut (i.e. T>0). For (d), the tensions T1 and T2 must be equal for P to be fixed.

 

[dunjaaa]

my bad, typo