How do I get someone to notice me w/o looking desperate?

An inclined plane wrapped around a metal shaft is a a. lever b. screw c. pulley d. wedge

Which of the following is not a transverse wave? a) soundb) lightc) radiod) all of thesee) none of these

At 20∘c, the hole in an aluminum ring is 2.800 cm in diameter. you need to slip this ring over a steel shaft that has a room-temperature diameter of 2.804 cm . 1. to what common temperature should the ring and the shaft be heated so that the ring will just fit onto the shaft? coefficients of linear thermal expansion of steel and aluminum are 12×10−6 k−1 and23×10−6 k−1 respectively.