A copper wire rheostat is composed of a 92 m length of wire wrapped on a core. Calculate the cross-sectional diameter of the wire in order for it to have a total resistance of 0.5 ohms at 20° Celsius.(=). Picture attached of table.

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 10.0 m: (a) the initially stationary spelunker is accelerated to a speed of 4.90 m/s; (b) he is then lifted at the constant speed of 4.90 m/s; (c) finally he is decelerated to zero speed. how much work is done on the 68.0 kg rescue by the force lifting him during each stage?

Which of the following bonds would be most polar? a. c-i b. c-br c. c-cl d. c-f e. c-o

What does si stand for,when referring to a system of measurement