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Q: As a rough guide, the quantity of blasting powder can be obtained by the rule - of - thumb. Select the correct option.
  • A. Blasting powder in N = (line of Least Resistance in m)² × 1.50
  • B. Blasting powder in N = (line of Least Resistance in m)²/1.50
  • C. Blasting powder in N = (line of Least Resistance in m)²× 1.75
  • D. Blasting powder in N = (line of Least Resistance in m)² /1.75
Correct Answer: Option A - As a rough guide, the weight of blasting powder can be obtained by using the following thumb-rule. Blasting powder in N = (line of least resistance in meter)² ×1.50 Where, N = Newton. Thus, when the line of least resistance is one meter then the quantity of blasting powder would be about 1.50 N. Weight of rock loosened is roughly 10,000 times weight of powder.
A. As a rough guide, the weight of blasting powder can be obtained by using the following thumb-rule. Blasting powder in N = (line of least resistance in meter)² ×1.50 Where, N = Newton. Thus, when the line of least resistance is one meter then the quantity of blasting powder would be about 1.50 N. Weight of rock loosened is roughly 10,000 times weight of powder.

Explanations:

As a rough guide, the weight of blasting powder can be obtained by using the following thumb-rule. Blasting powder in N = (line of least resistance in meter)² ×1.50 Where, N = Newton. Thus, when the line of least resistance is one meter then the quantity of blasting powder would be about 1.50 N. Weight of rock loosened is roughly 10,000 times weight of powder.