What is the approximate weight of 100 feet of charged 5 inch hose?

What is the approximate weight of 100 feet of charged 5 inch hose?

• A. 700 pounds
• B. 900 pounds
• C. 800 pounds
• D. 1000 pounds

Answer: (C)

When a fire hose is charged, the weight is mainly the water inside it. You can estimate the water weight per foot from the hose’s cross-sectional area and water density. A 5-inch hose has a radius of 2.5 inches, which is about 0.208 feet. The cross-sectional area is πr^2 ≈ 0.136 square feet. Water weighs about 62.4 pounds per cubic foot, so the weight of water per foot is 0.136 × 62.4 ≈ 8.5 pounds per foot. For 100 feet, the water portion weighs about 8.5 × 100 ≈ 850 pounds. Rounding to the nearest hundred gives roughly 800 pounds. The hose’s own dry weight is relatively small in comparison, so the total is still about eight hundred pounds. This is why the approximate weight for 100 feet of charged 5-inch hose is around eight hundred pounds.

When a fire hose is charged, the weight is mainly the water inside it. You can estimate the water weight per foot from the hose’s cross-sectional area and water density.

A 5-inch hose has a radius of 2.5 inches, which is about 0.208 feet. The cross-sectional area is πr^2 ≈ 0.136 square feet. Water weighs about 62.4 pounds per cubic foot, so the weight of water per foot is 0.136 × 62.4 ≈ 8.5 pounds per foot.

For 100 feet, the water portion weighs about 8.5 × 100 ≈ 850 pounds. Rounding to the nearest hundred gives roughly 800 pounds. The hose’s own dry weight is relatively small in comparison, so the total is still about eight hundred pounds.

This is why the approximate weight for 100 feet of charged 5-inch hose is around eight hundred pounds.