How much force would be necessary to pull up the 1000 newton box
pictured above?

explanation:

v=uf/(u-f)

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

prndulum needs thread, weight clock to time swings

96.77 amp

explanation:

rl = 250/100 = 2.5 ohms.

egl = 250 + (100 × 0.1) + 2 = 262 v.

at 700 r.p.m., eg2 = 262 × 700/1000 = 183.4 v.

if ia is the new current, then eg2 - 2 - (ia × 0.1) = 2.5 ia

which means this will give ia = 96.77 amp.