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A facility uses an 23 hp fan to blow-dry products on an conveyor belt in a plant that operates 24 hours a day, 365 days a year. For 34% of the time, the fan needs to run at full load, but for the remainder of the time the fan could run at 43% speed and meet the plant's needs. However, the plant currently runs the fan at 100% speed at all times. You recommend that the plant install a Variable Frequency Drive to allow the fan to run at the reduced speed when possible. Assume that the motor efficiency is 91.4 and the motor power factor is 0.85. Assuming that the plant pays $0.09 per kWh, and that a VFD costs $250 per hp, what is the simple payback period for this recommended change (in years)?
A hollow sphere is rolling along a horizontal floor at 5.00 when it comes to a 39.0 incline. How far up the incline does it roll before reversing direction
A parallel-plate capacitor has a plate separation of 1.74 centimeter and a plate area of 25 cm2. Find the voltage between the plates after the lift is complete
An arteriole have a length of 1.25 millimeter and a radius of 21.9 millimeter. Obtain the flow rate through the arteriole
Find the action variable for a ball with speed v bouncing between two elastic walls a distance d apart. Find the angle variable
An electric field of 6.70×105 V/m is desired between two parallel plates, Determine what charge must be on each plate
A 2 C charge and a 8 C charge repel each other with 10 N of force. How much will a 4 C charge and a 4 C charge repel each other when placed the same distance apart? Electrons are accelerated to reach a kinetic energy of 250 eV (= 4.0 x 10-17 J). If t..
A car is traveling at 66.2 mph. The driver applies the brakes and the car decelerates at 1.3 m/s2. What is the stopping distance
A chipmunk scampers about collecting in its cheeks safflower seeds that the birds dropped from the feeder hanging overhead. Find the components of the chipmunk\'s displacement
A coin placed on a turntable rotating at 40.0 rev/min will stay there if its center is placed no further than 8.5 cm from the axis of rotation, What is the coefficient of friction between the coin and turntable
An object hanging in air, as in Figure A below, caused the scale to balance at 0.420 kg. Find the apparent weight of the object when submerged in water
A puck of mass m1 = 1.50 kg slides in a circle of radius r = 20.0 cm on a frictionless table while attached to a hanging cylinder of mass m2 = 2.50 kg by a cord through a hole in the table
Determine the magnitude and direction of the anchoring force needed to hold the horizontal elbow and nozzle combination shown in Fig. P5.47 in place.
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