يقف طالب أمام مرآة محدبة، فتكون صفات صورته المتكونة A.
A حقيقية - معتدلة - أصغر من الجسم
B حقيقية - متدلة - أكبر من الجسم
C خيالية - معتدلة - أصغر من الجسم
D خيالية - معتدلة - أكبر من الجسم​

Aparticle moves in the xy plane with constant acceleration. at time zero, the particle is at x = 6 m, y = 8.5 m, and has velocity ~vo = (9 m/s) ˆı + (−2.5 m/s) ˆ . the acceleration is given by ~a = (4.5 m/s 2 ) ˆı + (3 m/s 2 ) ˆ . what is the x component of velocity after 3.5 s? answer in units of m/s.

The least penetrating form of radiation is

With the simplified model of the eye, what corrective lens (specified by focal length as measured in air) would be needed to enable a person underwater to focus an infinitely distant object? (be careful-the focal length of a lens underwater is not the same as in air! assume that the corrective lens has a refractive index of 1.62 and that the lens is used in eyeglasses, not goggles, so there is water on both sides of the lens. assume that the eyeglasses are 1.90