Density of air is 1.3kgm. what mass of air must be in a room 18m long 10m wide and 4m high ?

Chemical energy is a form of energy. a. heat b. kinetic c. potential d. electromagnetic

More solar radiation is absorbed by earth’s surface than by

Greg drew a diagram to compare two of the fundamental forces. which labels belong in the areas marked x, y and z? gravitational force electromagnetic force x. attractive y repulsive z: infinite range x: infinite range y attractive z. repulsive x. always attractive y: infinite range z: attractive or repulsive x. attractive or repulsive y infinite range z: always attractive