4. A uniform narrow bar, resting on ice, is given a transverse horizontal impulse at one end as shown. The center of mass will: (A) remain at rest (B) move in a circle (C) move in a straight line (D) move in a parabola (E) none of above

11. A small metal sphere is suspended from the conducting cover of a conducting metal ice bucket by a non-conducting thread. The sphere is given a negative charge before the cover is placed on the bucket. The bucket is tilted by means of a non-conducting material so that the charged sphere touches the inside of the bucket. Which statement is correct? (A) The negative charge remains on the metal sphere. (B) The negative charge spreads over the outside surface of the bucket and cover. (C) The negative charge spreads over the inside surface of the bucket and cover. (D) The negative charge spreads equally over the inside and outside surfaces of the bucket and cover. (E) The negative charge spreads equally over the sphere and the inside and outside surfaces of the bucket and cover.

4. A uniform narrow bar, resting on ice, is given a transverse horizontal impulse at one end as shown. The center of mass will:

(A) remain at rest
(B) move in a circle
(C) move in a straight line
(D) move in a parabola
(E) none of above

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