Water flows (v approx 20) over a dam at the rate of 630 kg/s and falls vertically 83 m before striking the turbine blades. Part A
Calculate the speed of the water just before striking the turbine blades (neglect air resistance).
Part B Calculate the efficiency rate at which mechanical energy is transferred to the turbine blades, assuming 64% efficiency.

we can see how the government has failed them.

trig 15.3 cos

if they have a finite resultant

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.