Abook weighing 12 n is placed on a table. how much support force does a table exert on the book?

Aquarterback pedals 3.3meters southward and then run 5.7meters northward. whats the distance ? and whats the displacement?

How much energy must a refrigerator absorb from 225 g of water so that the temperature of the water will drop from 35°c to 5°c

What component of earth’s atmosphere exists entirely as a result of photosynthesis?