A load of 500kg is lifted using a first class lever. Different effort distances and then corresponding efforts are shown in the table below. How far is the load from the fulcrum? Also find the values of A, B, C and D. Effort distance| 10cm | A. | 40cm | C| 100cm |
Effort. |1000N| 500N | B. | 200N | D |​

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

Karen is running forward at a speed of 9 m/s. she tosses her sweaty headband backward at a speed of 20 m/s. the speed of the headband, to the nearest whole number relative to a stationary observer watching karen

Which statement best explains why the overall charge on an atom is zero?