Two balls have the same mass of 5.00 kg. suppose that these two balls are attached to a rigid massless rod of length 2l, where l = 0.550 m. one is attached at one end of the rod and the other at the middle of the rod. if the rod is held by the open end and rotates in a circular motion with angular speed of 45.6 revolutions per second,(a) what is the tension for the first half of the rod, i. e., between 0 and l if the pivot point is chosen as origin? (b) what is the tension for the second half of the rod, i. e., between l and 2l if the pivot point is chosen as origin?

f=ma newton

f=100x2.5=250n

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.