作者:花组吝     |      日期:2019-03-07 01:09:00
By Duncan Graham-Rowe EXPERIENCED baseball fielders can tell how far a ball is going to travel just by listening to the crack of the bat. If they didn’t, they wouldn’t stand a chance of catching it, claims a physicist in New York. “When a baseball is hit straight at an outfielder, he cannot quickly judge the angle of the ascent and the distance the ball will travel,” says Robert Adair, a physicist at Yale University. If he relied purely upon visual information,