今天拋石頭
Is there anyone know under what circumstance that the angle b(bada) will
be const.
I thought such a crazy idea.
assume v=-R/tanb*t mv^2/R= mR/tan^2b * t^2=Tcosb
So T=mR/tanb* sinb* t^2
And ma=mdv/dt = m R/tanb*t^2=T sinb
Great T is the same It make sense.
但V向後跑 這不合理(除非繩子變長 而且會停下來)
Who know if the bada can be const. ?
p.s. T=To+at shound not can meet it Right?
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