The l-shaped member acb is supported by a pin and bracket at c and by an inextensible cord attached at a and b and passing over a frictionless pulley at d. the tension may be assumed to be the same in portions ad and bd of the cord. if the magnitudes of the forces applied at a and b are, respectively, p = 25 lb and q = 0, determine (a) the tension in the cord, (b) the reaction at c.

talk back to him about the sport and show him your expertise or leave the room

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.