-- card: 77935 from stack: in
-- bmap block id: 0
-- flags: 0000
-- background id: 5566
-- name: 


-- part contents for background part 15
----- text -----
Menu

-- part contents for background part 14
----- text -----
LEARNING

-- part contents for background part 6
----- text -----
Excerpt

-- part contents for background part 5
----- text -----
6 of 10

-- part contents for background part 4
----- text -----
•
Battleship floating in a bathtub
Can a battleship float in a bathtub?(see card 8) Of course, you have to imagine a very big bathtub or a very small battleship. In either case, there is just a bit of water all around and under the ship. Specifically, suppose the ship weighs 100 tons (a very small ship) and the water in the tub weighs 100 pounds. Will it float or touch bottom?

a) It will float if there is enough water to go all around it
b) It will touch bottom because the ship’s weight exceeds the water’s weight

The answer is: a. There are a lot of ways to show why. This way was suggested by a student. Consider the ship floating in the ocean (sketch I). Next, surround the ship with a big plastic baggie  —  this is actually done sometimes with oil tankers  — 
(sketch II). Next, let the ocean freeze except for the water in the baggie next to the ship (sketch III). Finally, get an ice sculptor to cut a bathtub out of the solid ice and you have it (sketch IV).

-- part contents for background part 22
----- text -----
• WHOLE EARTH
 • LEARNING
  • BEGINNING MIND
   • Physics

-- part contents for background part 23
----- text -----
06050317

-- part contents for background part 12
----- text -----
PHYSICS INTRODUCTION

-- part contents for background part 30
----- text -----
card id 74883

-- part contents for background part 31
----- text -----
card id 83357

-- part contents for background part 32
----- text -----
stack "WHOLE EARTH"
stack "LEARNING"
card id 43839
card id 41876

-- part contents for background part 27
----- text -----
card id 41876

-- part contents for background part 28
----- text -----
card id 218494

-- part contents for background part 29
----- text -----
card id 218494