) A beam of light is incident on the left side of a fiber optic cable with a square cross-sectional area making an angle of 20 degree with the normal to the left edge of the fiber optic cable. A) How far from the left edge will the beam of light reach the top of the fiber optic cable for the first time

Acave rescue team lifts an injured spelunker directly upward and out of a sinkhole by means of a motor-driven cable. the lift is performed in three stages, each requiring a vertical distance of 11.0 m: (a) the initially stationary spelunker is accelerated to a speed of 4.80 m/s; (b) he is then lifted at the constant speed of 4.80 m/s; (c) finally he is decelerated to zero speed. how much work is done on the 78.0 kg rescue by the force lifting him during each stage