Does energy have mass? Does it have volume? Does matter have either of these things?

1.) In "traditional" quantum mechanics, energy does not have mass, but there is an equivalency. Equivalency does not have to be sameness. Everything can be explained that way, and a particle that can only exist at v = c does not have to have any rest mass. It can still have momentum at v = c.

2.) Matter has mass and occupies volume. Heat, light, and other forms of electromagnetic energy do not have measurable mass and can't be contained in a volume.

3.) Matter is all the “stuff” that exists in the universe. It has both mass and volume. Mass measures the amount of matter in a substance or an object. Volume measures the amount of space that a substance or an object takes up.

Explanation:

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a small object of mass 3.66 g and charge -17.6 µc is suspended motionless above the ground when immersed in a uniform electric field perpendicular to the ground. what are the magnitude and direction of the electric field?

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.