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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)?
comets travel around the sun in elliptical orbits with large eccentricities. if a comet has speed 2.3times104 when at a
In an experiment to study magnetic induction , in the North Pole of a permanent magnet is moved left to right toward a coil having 20 turns at a constant speed of 20 cm/s. find Is the voltage positive or negative
Jupiter subtends an angle of 1.67 x10-4 rad when viewed by the unaided eye and 3.21 x 10-2 rad when viewed through an astronomical telescope that has a 0.031m focal length eyepiece. Determine the focal length of the telescope's objective lens.
A block of mass m = 3.07 kg is attached to a spring (k = 29.3 N/m) by a rope that hangs over a pulley of mass M = 6.14 kg and radius R = 8.81 cm. find the maximum extension of the spring
In a friendly game of handball, you hit the ball essentially at ground level and send it toward the wall with a speed of 15 m/s at an angle of 32° above the horizontal. (a) How long does it take for the ball to reach the wall if it is 4.2 m away? ..
An electron and a proton are a distance r = 7.7 x 10-9 m apart. How much energy is required to increase their separation by a factor of four
Two forces are applied to a tree stump to pull it out of the ground. Find the magnitude of the resultant force A + B
The difference between the gravitational force and air resistance is responsible for the downward velocity.
a solenoid 60 cm long and of radius 4.0 cm has 3 layers of windings of 300 turns each. a 2.0 cm long wire of mass 2.5 g
The friction force retarding the motion is 80 N. How large must P be if the acceleration of the moving box is to (a)zero and (b) 0.75m/s2?
The task is to design a rocket which will accelerate a payload of mas 100 kg, from a velocity of 0 m/s to 6,000 m/s in intersteller space.
A satellite is in a circular orbit around an unknown planet. The satellite has a speed of 1.65 x104 m/s, and the radius of the orbit is5.05 x 106 m. Asecond satellite also has a circular orbit around this same planet. The orbit of this second satell..
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