in a lever, an effort of 400N is applied to lift a load of 600N. if the load is at a distance of 20 cm from the fulcrum and effort ia at a distance of 40 cm. calculate the M. A.V. R. and effecting of the lever.​

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 human body stores chemical energy from digested food. some of the chemical energy is converted into mechanical energy when the body moves. which statement best supported by this information

What are similarities and differences between refraction, reflection, diffraction and absorption?