A hand holding a rope moves up and down to create a transverse wave on the rope. The hand completes an oscillation in 1.2 s, and the wave travels along the string at 0.8 m/s. The amplitude of the wave is 0.1 m. a.) Find the frequency at which the crests pass a given point in space.

1 a

2 b

3 b

4 d

5 d

6 d

explanation:

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.