Tightening a screw with a larger spacing between its threads requires fewer turns of a screwdriver than tightening a screw with smaller thread spacing. what is a disadvantage of the screw with larger thread spacing?

It requires more power to tightening.

Explanation:

The distance of thread spaces of a screw effects the distance of screw that turned for one turn. For instance, a screw with 1 mm thread space goes into a material for 1mm when it turn once. The more space of thread space means the more distance screw goes into a material. But at the same time it requires more force to go in. This is the disadvantage of the screw with larger thread spacing

explanation:

v=uf/(u-f)

= 5.-10/(5+10) convex lens has negative focal length

5 w for 1hr = 5x60x60 joules=300x60=3000x6=18,000j as total energy conversion. efficiency of bulb needed for radiant to thermal within 18000