# CAPA 2 - F TcosEg Tsin T m 1[1pt A person scuffing her feet...

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mg F E T Tsin θ Tcos θ 1. [1pt] A person scuffing her feet on a wool rug on a dry day accumulates a net charge of -42.1uC. How many excess electrons does this person get? Correct, computer gets: 2.63e+14 2. [1pt] By how much does her mass increase? Correct, computer gets: 2.40e-16 kg 3. [1pt] Three charges are arranged on a line as shown above. (For each statement select T True, F False). A) If Q 1 is positive, Q 2 is negative and Q 3 is negative, then Q 2 MUST feel a net force to the right. B) If Q 1 is positive, Q 2 is negative and Q 3 is positive, then Q 2 MUST feel a net force to the right. C) If Q 1 is negative, Q 2 is negative and Q 3 is positive, then Q 2 MUST feel a net force to the right. D) If Q 1 is positive, Q 2 is negative and Q 3 is positive, then Q 2 MIGHT feel a net force to the right. Correct, computer gets: FFTT 4.[1pt] Two small spheres with charges -4 C and -9 C are held 9.5 m apart. Find the magnitude of the force between them. Correct, computer gets: 3.59E+09 N Hint: This is an application of Coulomb's Law.

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5.[1pt] Four charges Aq,Bq,Cq, and Dq (q = 3.50 x 10 -07 C) sit in a plane at the corners of a square
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## This note was uploaded on 11/07/2010 for the course PHYS 1120 taught by Professor Rogers during the Spring '08 term at Colorado.

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CAPA 2 - F TcosEg Tsin T m 1[1pt A person scuffing her feet...

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