IT'S IN THE BOOK- PAGE182 NO.11 :p
yep
No they are made of rubber and plastic.
A tennis ball is basicaly a ball filled with air through a valve. I don't kanow too much about it, I have to admit.
You have a plastic box that is 15cm wide x 20cm long x 10cm deep, and it weighs 30 grams. Its volume is 3000cm3, the area that will contact the water is 300cm2, and its density is .01g/cm3. An object will displace water until the weight of water displaced is equal to the weight of the object. Divide the mass by the surface area, and we learn the box will sink into the water one millimeter. Now add six 60g tennis balls to it. The total weight is now 390g - thirteen times the mass of the empty box. Divide the mass by the surface area, and the box will sink into the water 13mm.
It was a sphere, same as now. However, originally, tennis balls were filled with sawdust, sand, chalk, or dirt. Then, Louis XI of France declared that all tennis balls be made of good leather and well-stuffed with wool.
A ball pit is a play area intended for children, filled with colourful plastic balls.
tennis balls are furry and raquet balls are not . tennis balls are also bigger.
New tennis balls are considered fresh and not "flat". Old tennis balls exposed to play and air become flat and do not perform normally in a match.
To play tennis, basically all you need is a racket your size, tennis balls, tennis court shoes and tennis balls. Very Simple.
The Stars' Tennis Balls has 388 pages.
Tennis Balls
Slazenger tennis balls are used at Wimbledon.