Which sounds can be heard safely by humans without
risking damage to the ear? Check all that apply.
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rustling leaves
normal conversation
vacuum cleaner
front row at a rock concert
jet takeoff

These sounds can be heard safely by humans without risking permanent hearing loss:

-- rustling leaves . . . . . Yes

-- normal conversation  . . . . . Yes

-- vacuum cleaner  . . . . . Yes IF it's on the floor and you're standing up.

-- front row at a rock concert . . . . . No

-- jet takeoff . . . . . Yes BUT only if you're at least a mile away from the jet.

explanation:

could i give you a exaplo that could you?

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.