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Q. A person is trying to judge whether a picture (mass = 0.7 kg) is properly positioned by temporarily pressing against the wall. The pressing force is perpendicular to the wall. The coefficient of static friction between the picture and the wall is 0.66. What is the minimum pressing force that must be used?

Q. Two point charges Q1=+5.00 nC and Q2=_3.00 nC are separated by 35.0cm. (a) What is the electric potential at a point midway between the charges? (b) What is the potential energy of the pair of charges? What is the significance of the algebraic sign of your answer?

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