Since there are over 300 days of sunshine in Colorado, my son-in-law rigged up a solar-powered "water heater" for his kiddie pool
in his backyard. He used 250 feet of 1/2 inch diameter hose filled with water (see photos below).
How many gallons of water are being heated?
Solution to the Problem:
The answer is 2.55 gallons of water.Think of the rolled up hose as a cylinder 250' long with a diameter of 1/2".
Then use the formula for the Volume of a cylinder to solve.
You must covert 250 feet to inches by multiplying by 12.
Then you must use the conversion formula to convert cubic inches to gallons of water.
Correctly solved by:
| 1. Veena Mg | Bangalore, Karnataka, India |
| 2. Maddy Woodson |
Redlands Middle School, Grand Junction, Colorado |
| 3. Ivy Joseph | Pune, Maharashtra, India |
| 4. Colin (Yowie) Bowey | Beechworth, Victoria, Australia |