Tanks of compressed gas must be kept away from heat sources. if the temperature of the tank increases too much, it may explode and cause a great deal of damage. which of the following best explains why a tank of compressed gas can explode if it is heated? . a. as the gas is heated, the molecules break apart into individual atoms and move apart. b. as the gas is heated, the molecules move faster and spread out from each other. c. as the temperature of the gas increases, the molecules release energy and move faster. d. as the temperature of the gas increases, the molecules gain energy and move sl

As the gas is heated, gas molecules will move faster. As they move faster, they will spread further apart, causing expansion. This expansion is what will cause the tank to explode. So the best answer is option B, the molecules travel at a faster rate of speed and spread out.

air exerts forces on falling objects near earth’s surface.

explanation:

the term 'free falls' refer to object that are falling towards the earth, in a situation in which gravity is the only force acting on the object.

for an object in free fall, the acceleration is constant (g, the gravitational acceleration), and so the velocity of the object constantly increases.

for objects near earth's surface, there is always another force acting on the object: the resistance due to the air. this force is opposed to the direction of fall of the object, and it is proportional to the velocity of the object, so as the object falls down, this force increases up to a point when it balances the force of gravity, and the object continues its motion at constant velocity (called terminal velocity). since in this case gravity is not the only force acting on the object, we are not in a situation of free fall.