One end of a steel bridge is struck by a hammer. the sound produced is transmitted through the bridge and through the air to the other side of the bridge. there is a 1.4 s delay between the arrivals of the two sounds. what is the length of the bridge if the velocity of sound in air is 340 m/s and in steel is 5100 m/s. m

an energy transformation flow diagram is shown

where is 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.