Now, letâs get down to business â the cost! They do offer a 30 day free trial and then after that it is $7.95 a month or $79 a year. After just a few weeks of Nathan playing, I personally feel that the $7.95 a month is totally worth it!
A pendulum is a weight suspended from a pivot so that it can swing freely. When a pendulum is displaced sideways from its resting, equilibrium position, it is subject to a restoring force due to gravity that will accelerate it back toward the equilibrium position.
Swing weight is a subjective measure of how much a racquet feels like it weighs, when in motion or as you can guess when you are taking a swing at the ball. A racket that say weights 400grams can feel like it weighs only 350g when you play with it, then the swing weight would be lighter than the actual weight.