Presumably, the guy who invented tennis.
Tennisball (factoryreject)
it is a baseball or a tennisball.
there is a rubber lining, but it is full of air.
On average, 2 pounds.
tennisball toast
2.67 to 2.77 grams is acceptable
Use a flashlight, a tennisball and a golfball. Put them in line, with the flashlight (turned on obviously) for the sun, the tennisball for the earth and the golfball (behind the tennisball, relative to the flashlight) for the moon. Turn off the room light(s). Obviously the Earth blocks the light from the sun so that the moon is dark.
The picture is called "tennisball."
Do you mean floats? Tennisball, football, basketball, pool toys....
Playdough costs $5 for a blob the size of a tennisball
The volume of a sphere is: V = 4πr3/3 and the density is approx. 0,4 g/cm3.
Raquetball