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Q. The 4.00-{rm kg} block in the figure is attached to a vertical rod by means of two strings. When the system rotates about the axis of the rod, the strings are extended and the tension in the upper string is 83.0 N.
How many revolutions per minute does the system make?

Q. A proton moves 3.5 cm parallel to a uniform electric field of E = 250 N/C.

(a) How much work is done by the field on the proton?

(b) What change occurs in the potential energy of the proton?

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