Suppose a utility charges its large industrial customers $0.08/kWh for energy plus $10/mo per peak kVA (demand charge). Peak kVA means the highest level drawn by the load during the month. If a customer uses an average of 750 kVA during a 720-h month, with a 1000-kVA peak, what would be their monthly bill if their power factor (PF) is 0.8

$42,560

Explanation:

Given that :

Charge per kwh = $0.08

Peak kvA = $10 /month

Total hours = 720 hours / month

Peak = 1000kVA

Power factor (PF) = 0.8

Averga power = 750k

Power consumption (Active) = PF* average Powe

Active consumption =. 0.8 * 750 = 600kW

Energy used = 600 * 720 = 432000 KW

Cost = 432000 *$0.08 = $34,560

Peak Energy = 0.8 * 1000 = 800 KW

Cost = $10 * 800 = $8000

Total = $(34,560 + 8000)

Total = $42,560

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.