6. What force must you exert on a ball point pen in order to apply a pressure of .08 N/mm? on a piece of paper, it the ball of the pen has a surface area of 1.22 mm² touching the
paper?

Explain why the aperture of the spherical mirror should be small compared to the radius of curvature of the mirror.

Two polarizers are oriented at 24.0∘ to one another. light polarized at a 12.0-degree angle to each polarizer passes through both. what is the transmitted intensity (%)?

Alead ball is dropped into a lake from a diving board 5m above the water . it hits the water with a certain velocity and then sink with constant velocity in bottom . it reaches the bottom 5 second after it is dropped if g= 10m/s2 . find depth of the lake and average velocity of the ball ?