What force must you exert on a ball point pen in order to apply a pressure of0.067 N/mm2on a piece of paper, if the ball of the pen has a surface area of1.2 mm2touching the paper?

The force that must be exerted on the pen is 0.0804 N.

Explanation:

Given;

pressure applied on a piece of paper by ball point of the pen, P = 0.067 N/mm²

surface area of the pen ball point, A = 1.2 mm²

The force that must be exerted on the pen is calculated as;

F = P x A

F = (0.067 N/mm²) x (1.2 mm²)

F = 0.0804 N

Therefore, the force that must be exerted on the pen is 0.0804 N.

as a general rule, scissors have blades less than 6 in (15 cm) long and usually have handles with finger holes of the same size. shears have blades scissors used to cut hair or fabric must be much sharper

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