Calculating Buoyancy (# Pennies)

Penny Barge DesignMr. Yersak

Livingston High SchoolTechnology & Design I

Dimension your vesselLength – Width - Height

2”

4”

3”

Determine the Volume of the Barge

2”

4”

3”

HOW TO:• LENGTH x WIDTH x HEIGHT =

VOLUME24 cu. in.

How many inches are there in a cubic foot?

1,728

Divide the Barge Volume by the # of cubic inches in a

cubit foot

2”

4”

3”

24 cu. in. / 1728 = .013 cubic feet

The weight of water

64 pounds per cubic foot

Determine the pounds of water displaced by the

barge.

=.832 pounds displaced

HOW TO:• .013 cubic feet x 64 lbs. per

c^3 ft.

Determine the mass of the barge

2”

4”

3”Aprox. 100 Grams

Grams in a Pound?

1 pound = 453.6 grams

Convert grams to pounds

2”

4”

3”.22 pounds

HOW TO:• 100 / 453.6 = .22 pounds

Subtract weight of barge from weight of displaced water to

find penny load

HOW TO:• .832- .22

= .612 pounds of pennies

Convert penny load lbs. into mass:

HOW TO:• .612 x 453.6

= 277 grams of pennies

What is the mass of a penny?

2.78 grams

Estimated pennies the barge can hold.

HOW TO:• 277 grams of pennies / 2.78

mass of pennies

= 99 pennies

THE HMS YERSAK AFTER IT HIT NATHAN’S BOAT