What kind of changes such as an increase/decrease in temperature or in the amount of water, landscape changes, and changes in sunlight availability, etc. that lead to adaptations?

In raising a 6200-n piano with a pulley system, the movers note that, for every 2.2 m of rope pulled down, the piano rises 0.12 m . ideally, find the force required to lift the piano.

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

1. how to locate the image in converging(concave) mirror and diverging (convex) mirror with salt. 2. how to locate the image in a converging (convex) lens and diverging (concave) lens with salt.