Your aunt just turned 50 and now needs glasses to read.

(a) what is the name of this condition? ("–opia")
(b) does your aunt need converging lenses or diverging lenses?
(c) your aunt goes to the store and buys glasses which say +0.75 (meaning, +0.75 d). what is the focal length of these glasses?
(d) assuming these glasses (from part c) bring your aunt’s near point to 25 cm, what is her near point without corrective lenses?

16. a brave but inadequate rugby player is being pushed backward by an opposing player who is exerting a force of 800 n on him. the mass of the losing player plus equipment is 90.0 kg, and he is accelerating at 1.20m/s2 size 12{1 "." "20"" m/s" rsup { size 8{2} } } {} backward. (a) what is the force of friction between the losing player’s feet and the grass? (b) what force does the winning player exert on the ground to move forward if his mass plus equipment is 110 kg? (c) draw a sketch of the situation showing the system of interest used to solve each part. for this situation, draw a free-body diagram and write the net force equation.