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Q 9: A 3.0 g aluminum foil ball with a charge of +4.0×10−9C is suspended on...

Q 9:

A 3.0 g aluminum foil ball with a charge of +4.0×10−9C is suspended on a string in a uniform horizontal E→ field. The string makes an angle of 30∘ with the vertical.

Part A:

If the string is cut, how long will it take the ball to fall to the floor 2.6 m below the level of the ball?

Express your answer with the appropriate units.

Part B:

Q 12:

During a lightning flash, -17 C of charge moves through a potential difference of 8.5×107 V.

Determine the change in electric potential energy of the field-charge system.

Express your answer with the appropriate units.

How far will the ball travel in the horizontal direction while falling?

Express your answer with the appropriate units.

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