Question

Albert stands on a frictionless turntable, holding a bike wheel. Both Albert and the wheel are initially stationary. Albert gives the bike wheel a good spin, and it begins rotating clockwise. If the bike wheel has a final angular momentum of one unit, clockwise, what is the final angular momentum had by the rest of the system (i.e., Albert and the turntable)?

Answer 1

L₁ = 0

Step-by-step explanation:

The total angular momentum of the system is conserved:

Lin = Lfin

If

Lin = Lwheel = - L₀ = -1

Lwheel final = - L₀ = -1

Lfin = LAlbert+turntable + Lwheel final = - L₀ + L₁ = -1 + L₁ = ?

If Lin = Lfin ⇒

⇒ -1 = -1 + L₁ ⇒ L₁ = 0