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A disk slides toward a motionless stick on a frictionless surface (figure below). The disk strikes and
adheres to the stick and they rotate together, pivoting around the nail. Angular momentum is
conserved for this inelastic collision because the surface is frictionless and the unbalanced external
force at the nail exerts no torque.
Before
After
M
Nail (pivot)
(a)
(b)
Consider a situation where the disk has a mass of 51.6 g and an initial velocity of 34.8 m/s when it
strikes the stick that is 1.37 m long and 2.1 kg at a distance of 0.100 m from the nail.
a. What is the angular velocity of the two after the collision? (Enter the magnitude.)
rad/s
b. What is the kinetic energy before and after the collision?
KEO
= 31.2
KEf=
J
Ꮉ Ꭻ
Transcribed Image Text:A disk slides toward a motionless stick on a frictionless surface (figure below). The disk strikes and adheres to the stick and they rotate together, pivoting around the nail. Angular momentum is conserved for this inelastic collision because the surface is frictionless and the unbalanced external force at the nail exerts no torque. Before After M Nail (pivot) (a) (b) Consider a situation where the disk has a mass of 51.6 g and an initial velocity of 34.8 m/s when it strikes the stick that is 1.37 m long and 2.1 kg at a distance of 0.100 m from the nail. a. What is the angular velocity of the two after the collision? (Enter the magnitude.) rad/s b. What is the kinetic energy before and after the collision? KEO = 31.2 KEf= J Ꮉ Ꭻ
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