A0.50 kg mass attached to hanging weight, is whirled in a circle of radius 0.20m at 2.3 m/s. calculate the centripetal force acting on the mass

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

Do you agree with scientist’s prediction about the warming of alaska and other polar regions?

The long handle on a rake is a(n) a. lever b. screw c. wedge d. inclined plane