Which is example of radiation

Determine the amount of work done when a crane lifts a 100-n block form 2m above the ground to 6m above the ground

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.

Another word for electromagnetic energy is a. heat b. force c. matter d. radiation