Question

When talking about roofing, nail penetration must be a minimum ? of into the sheathing.

1) 1/2 inch
2) 1 inch
3) 1 1/2 inch
4) 2 inches

Answer 1

To calculate the percentage of nails used, we compare the difference in spring stretch from 50 cm to 30 cm, resulting in 20 cm used. This represents 2/5 or 40% of the nails being used during the day.

Step-by-step explanation:

When determining the fraction or percentage of nails used based on the spring stretch measurements, we can set up a ratio. Assuming that the stretching of the spring is directly proportional to the weight of the remaining nails, we can compare the change in stretch length to find the amount used during the day. The spring stretched 50 cm at the start and 30 cm at the end.

The difference between the initial and final stretch lengths gives us the amount of stretch used up, which corresponds to the nails used. So, the change in stretch is 50 cm - 30 cm = 20 cm. This means out of the initial 50 cm stretch, 20 cm worth of nails have been used, which is 2/5 or 40% of the nails.

To calculate the percentage of nails used, we compare the difference in spring stretch from 50 cm to 30 cm, resulting in 20 cm used. This represents 2/5 or 40% of the nails being used during the day.