Aclear reflection of mount hood can be seen in mirror lake. surfaces, such as this one, allow for specular reflection. light can be thought of as a bundle of individual light rays which are traveling parallel to each other. each individual light ray follows the law of reflection. if the bundle of light rays is incident upon a smooth surface, like mirror lake,

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

The of a machine determines its "usefulness." a. input force b. output force c. mechanical advantage

What is special about a dc circuit ?