- #1
eosphorus
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- 0
i have a tetherball that goes from a radius of 1 m to a radius of 2 m.
the initial speed is 1 m/s, what's the final speed?
if its 0.5 m/s the energy of the ball halfs so it must be transferred to Earth via pole thickness so the Earth gains kinetic energy so gains momentum,so the momentum of the whole system grows
if its 1 m/s then conservation of momentum fails because momentum has doubled and besides some torque has been applied to Earth via the pole thickness
the initial speed is 1 m/s, what's the final speed?
if its 0.5 m/s the energy of the ball halfs so it must be transferred to Earth via pole thickness so the Earth gains kinetic energy so gains momentum,so the momentum of the whole system grows
if its 1 m/s then conservation of momentum fails because momentum has doubled and besides some torque has been applied to Earth via the pole thickness