Aheat engine operating between energy reservoirs at 20∘c and 600∘c has 30% of the maximum possible efficiency. you may want to review (pages 333 - 335) . part a how much energy must this engine extract from the hot reservoir to do 1000 j of work?

Sorry my friend i don't know the answer. i am just in 6th

answer and explanation;

composition refers to both the types of minerals within a rock and the overall chemical makeup of the rock while texture refers to the size and arrangement of the minerals or grains that make up a rock. both composition and texture can be used to classify rocks, such as igneous rocks. texture describes how the rock became solid or crystallized from liquid, melted rock. composition of a rock describes the minerals that make up a particular rock.

Velocity is the speed of an object in a certain direction so you'd need to know speed and direction