Ompare the mass of an ice cube to the mass of the water once the cube is completely melted. a) the mass of water formed equals the mass of ice. b) the mass of water formed is more than the mass of ice. c) the mass of water formed is less than the mass of ice. d) the mass of water formed does not depend on the mass of ice.

Your answer here is A.

Explanation:

Water expands when it freezes, but that doesn't mean you get more water after freezing water, and then unfreezing it.

it becomes positively charged by charging it

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.