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Q. On a highway curve with radius 80m, the maximum force of static friction (centripetal force) that can act on a 1,000kg car going around the curve is 8,000N. What speed limit should be posted for the curve so that cars can negotiate it safely?

Q. A 5.2 {rm cm}-thick layer of oil (n; =; 1.46) is sandwiched between a 1.3 {rm cm}-thick sheet of glass and a 2.5 {rm cm}-thick sheet of polystyrene plastic (n ;=; 1.59).How long (in {rm ns}) does it take light incident perpendicular to the glass to pass through this 9.0 {rm cm}-thick sandwich?

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