Date: Wed, 11 Oct 2006 12:46:45 -0400 (EDT)
Subject: Density of Marbles Vs. Bowling Balls

Google Search: marbles + official

http://www.streetplay.com/thegames/marbles/tourney.shtml
"All marbles in any one playing ring must be of uniform size. The standard
size shall be five-eighths inch in diameter. Slight variation may be allowed
by the referee for manufacturing fault.

Shooters shall be round and made of any substance except steel or any other
metal, and shall not be less than one-half inch nor more than six-eighths
inch in diameter as determined by the referee."

***TO-DOs***
(x) Use digital balance to measure mass of marble. Use calipers to measure
the diameter of marbles; calculate volume of a sphere. Calculate density.

Volume (sphere) = 4 x pi x r(3) / 3 ...or... V = pi x d(3) / 6

SMALLER MARBLE:
mass: 3.60g
diameter: 1.38cm
V = 8.25cc/6 = 1.375cc
D = 3.60g / 1.375cc = ~2.62 g/cc (2.618)

(MARC) RIVERS' MARBLE:
mass: 5.30g
diameter: 1.6cm
V = 12.86cc /6 = 2.14cc
D = 5.30g / 2.14cc = ~2.48 g/cc (2.476)

Bottom line: Marbles sink in water!

--
(x) Use Science Olympiad bathroom scale to measure the weight of bowling
ball.
Columbia 300 9B57030 (green swirl)
Weight = ~9-10 lb, +/- 1 lb (estimated inaccuracy of scale)
10 pound = 4.5359237 kilograms (4,535.9237 grams)

==
Related Question: What is the volume of a regulation bowling pin?

==
http://en.wikipedia.org/wiki/Bowling_ball

"Regulation ten-pin bowling balls must weigh between 6 and 16 pounds
(2.7-7.2 kg) and have a diameter of 8.5 inches (21.6 cm). Since the physical
size of regulation balls is the same, while the weight may differ, lighter
balls are much less dense than heavier ones. Thus, 6-10 pound balls will
actually float when placed in water."

--
Google Search: 6 lb = ? kg
6 pound = 2.72155422 kilograms
Google Search: 10 lb = ? kg
10 pound = 4.5359237 kilograms

--
http://www.lerc.nasa.gov/WWW/K-12/airplane/volume.html
Volume of sphere
V = pi x d(3) / 6

V = 3.14 x 21.6cm x 21.6cm x 21.6cm / 6
V = 31,643.96544cc / 6
V = 5,273.99424 cc

--
6lb ball
D = m/v
D = 2,721.55g / 5,273.99cc
D = 0.5160 g/cc

10lb ball
D = m/v
D = 4,535.92g / 5,273.99cc
D = 0.8600 g/cc

--
D = m/v
D = 5,273.99g / 5,273.99cc
D = 1.0 g/cc

Google Search: 5.27399 kg = ? lb
5.27399 kilograms = 11.6271577 pound <-- ball would have neutral buoyancy

==
HOCKEY PUCK:
mass: 161.13g
diameter: 7.5cm (radius: 3.75cm)
height: 2.5 cm

Volume (cylinder) = pi x r(2) x h
V = 3.14 x 3.75cm x 3.75cm x 2.5cm
V = 110.39cc

D = m/v
D = 116.13g / 110.39cc
D = ~1.46 g/cc (1.4596)

Bottom line: Hockey puck sinks in water!