Galileo and Scaling

1
Galileo and Scaling

• Physics 109

2
Imagine the earth a perfect sphere, with a rope
just fitting around the equator. Another rope,
60 feet longer, is placed above the first rope,
the same distance above it all the way around.
How far above, approximately?

• About one inch
• About one foot
• About ten feet

3
What fraction of the areaof a circle is occupied
by another circle of half the radius?

• one-quarter
• One third
• 1/p

4
How many solid spheres of diameter one inch are
needed to balance one sphere of the same material
of radius two inches?

• 2
• 4
• 8

5
How much paint is needed to paint eight one-inch
spheres compared to one two-inch sphere?

• The same amount
• Twice as much
• Four times as much

6
The surface area of your lungs is approximately

• 5 square meters
• 15
• 25
• 50
• 100

7
A flea the size of a man could jump about

• 1 meter
• 10
• 100