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Q. On a dry day, just after washing your hair to remove natural oils and drying it thoroughly, run a plastic comb through it. Small bits of paper will be attracted to the comb. Explain why?

Q. What is the maximum speed with which a 1100 rubber-tired car can take this curve without sliding? (Take the static coefficient of friction of rubber on concrete to be 1.0.) A concrete highway curve of radius 60.0 is banked at a 13.0 angle.

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