During a total solar eclipse, when the sun's is blocked by the moon, the sun's can be seen as a white halo. a. prominence; flare b. photosphere; corona c. flare; prominence d. corona; photosphere

When a book falls from a shelf to the ground without anyone pushing on it, no work is done on the book. true or false

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.

Debris produced by mining is called