Which word means a light, sharp blow, as on a door or across the knuckles?

A library in a villa in Herculaneum, buried by which volcano's eruption in A.D. 79, was found in the mid-1700s? A library in which state capital includes a near-complete collection of Kansas newspapers since 1875? A library stands on the site of the University of Chicago's old Stagg Field. In 1939 the university dropped which sport… Which librettist was born in London on November 18, 1836? Which word means both a light stroking touch and a dense growth of bushes? A light-year is a unit that measures what? A limited edition of which 1980 Stephen King novel featured an aluminum-coated asbestos cloth cover? A limited-edition silver dollar featured which Black baseball pioneer and the inscription "Rookie of the Year 1947"?