Size the channel for a mechanically cleaned coarse bar rack for a flowrate of 40,000 m3 /d. the bar rack will be set at an angle of 75 degrees from horizontal and will have clear bar spacing of 12 mm. the bar rack uses 12-mm-wide by 25-mm deep bars. the upstream channel velocity should be greater than 0.4 m/s. determine the headloss through the bar rack for the clean screen and for a screen that is 50 percent clogged.

not moving. pos accel,

beta is electron from nucleus

something from nucleus has changed, but charge must be same for cons of charge

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.