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  • Golf club

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    irons, and a putter. A golf club is a club used to hit a golf ball in a game of golf. Each club is composed of a shaft with a grip and a club head. Woods are mainly used for long-distance fairway or tee shots; irons, the most versatile class, are used for a variety of shots; hybrids that combine design elements of woods and irons are becoming increasingly popular; putters are used mainly on the green to roll the ball into the hole. A standard set consists of 14 golf clubs, and while there are traditional combinations sold at retail as matched sets, players are free to use any combination of 14 or fewer legal clubs. An important variation in different clubs is loft, or the angle between the club's face and the vertical plane. It is loft that is the primary determinant of the ascending trajectory of the golf ball, with the tangential angle of the club head's swing arc at impact being a secondary and relatively minor consideration (though these small changes in swing angle can nevertheless have a significant influence on launch angle when using low-lofted clubs). The impact of the club compresses the ball, while grooves on the club face give the ball backspin.

  • Electric car energy efficiency

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    The following table compares official ratings for fuel economy (miles per gallon gasoline equivalent in the case of plug-in electric vehicles) for series production all-electric passenger vehicles rated by the EPA , versus EPA rated most fuel efficient plug-in hybrid with long distance range (Chevrolet Volt second generation), gasoline-electric hybrid car (Toyota Prius Eco - fourth generation), and EPA's average new 2016 vehicle, which has a fuel economy of . Comparison of fuel efficiency and costs for all the electric cars rated by the EPA for the U.S. market against EPA rated most fuel efficient plug-in hybrid, hybrid electric vehicle and 2016 average gasoline-powered car in the U.S.

  • Hybrid (golf)

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    thumb A hybrid is a type of club used in the sport of golf with a design borrowing from both irons and woods while differing from both. The name "hybrid" comes from genetics to denote a mixture of two different species with desirable characteristics of both, and the term here has been generalized, combining the familiar swing mechanics of an iron with the more forgiving nature and better distance of a wood. For many players, long irons (numbers 1-4) are difficult to hit well even with modern clubfaces, due to the low trajectory and very small face of the low-loft clubhead. Players tend to avoid these clubs in favor of fairway woods which have a larger "sweet spot" to hit with, but such woods, having longer shafts, have a different swing mechanic that is sometimes difficult to master. The long shaft of a fairway wood also requires lots of room to swing, making it unsuitable for tighter lies such as "punching" out from underneath trees. In addition, the fairway wood clubface is designed to skim over instead of cutting into turf, which makes it undesirable for shots from the rough. The answer to this dilemma for many players is to replace the 1-4 irons with hybrids.

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