An aluminum bar 600mm long with diameter 40mm, has a hole drilled in the center of the bsr. The hole is 30mm in diameter and is 100mm long. If the modulus of elasticity for the aluminum is 85GN/m2, calculate the total contraction on the bar due to a compressive load of 180KN

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.

where is the photo and the answer choices?