What is the scale distance factor for the range 300 feet to 5000 feet?

What is the scale distance factor for the range 300 feet to 5000 feet?

• A. 55
• B. 65
• C. 300
• D. 5000

Answer: (A)

Scale distance factor is the constant used to relate how far a blast’s effects extend to the amount of explosive used. It appears in the scaled distance formula SD = D / sqrt(W), where D is distance and W is the weight of explosive. The factor given for the range from 300 feet up to 5000 feet is 55, meaning distances within that band follow D ≈ 55 × sqrt(W). For example, a 100-pound charge would project to about 550 feet (55 × sqrt(100) = 55 × 10), and a 1,000-pound charge to about 1,740 feet (55 × sqrt(1000) ≈ 55 × 31.6), both within the 300–5000 ft range. This shows how the factor connects distance and charge to describe the same scale of blast effect. The other options represent actual distances or different factors, not the scale distance factor for this range.

Scale distance factor is the constant used to relate how far a blast’s effects extend to the amount of explosive used. It appears in the scaled distance formula SD = D / sqrt(W), where D is distance and W is the weight of explosive. The factor given for the range from 300 feet up to 5000 feet is 55, meaning distances within that band follow D ≈ 55 × sqrt(W). For example, a 100-pound charge would project to about 550 feet (55 × sqrt(100) = 55 × 10), and a 1,000-pound charge to about 1,740 feet (55 × sqrt(1000) ≈ 55 × 31.6), both within the 300–5000 ft range. This shows how the factor connects distance and charge to describe the same scale of blast effect. The other options represent actual distances or different factors, not the scale distance factor for this range.