3. If a neutron is scattered through 90° in an elastic collision with an initially stationary deuteron in the Lab. frame, what is the fractional loss of its kinetic energy assuming that the situation is non-relativistic and mdeuteron = 2 mneutron? (A) 1/3 (B) 1/2 (C) 2/3 (D) 3/4

4. A point-like bug of mass m lies on the rim of a uniform disk of mass M that can rotate freely about its center. Initially the bug and disk rotate together with an angular velocity ω₀. Then the bug walks half way to the center of the disk. What is ratio of the new kinetic energy of the system to its initial kinetic energy? (A) (4m+2M)/(m+2M) (B) (m+2M)/(4m+2M) (C) (2m+4M)/(2m+M) (D) (2m+M)/(2m+4M)

3. If a neutron is scattered through 90° in an elastic collision with an initially stationary deuteron in the Lab. frame, what is the fractional loss of its kinetic energy assuming that the situation is non-relativistic and m_deuteron = 2 m_neutron?
(A) 1/3
(B) 1/2
(C) 2/3
(D) 3/4

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