10. What is the minimum (static) coefficient of friction required for the hollow sphere to roll without slipping? (A) (B) tan φ (C) (D) tan φ (E) none of the above.

8. Consider a cube of density ρ and horizontal cross-sectional area L² with vertical height L. The cube is floating in a liquid with density ρ_L. At equilibrium a fraction L₀/L of the cube is immersed in the liquid. Now let's push down the cube a little bit and release it. What is the period of the subsequent oscillation? (A) (B)(C)(D)(E) none of the above.

10. What is the minimum (static) coefficient of friction required for the hollow sphere to roll without slipping?
(A)
(B) tan φ
(C)
(D) tan φ
(E) none of the above.

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