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A differential band brake is used to control the speed of a drum. Determine the minimum value of the coefficient of static friction for which the brake is self-locking when the drum rotates counter clockwise.
illustrates how the forces can vary in problems of this type. A hiker, who weighs 739 N, is strolling through the woods and crosses a small horizontal bridge. The bridge is uniform, weighs 3250 N, and rests on two concrete supports
An Australian emu is running due north in a straight line at a speed of 13.0 m/s and slows down to a speed of 10.5 m/s in 3.60 s. (a) What is the magnitude and direction of the bird's acceleration
Design a 2-bit counter that, when f = 1, counts in the repeating sequence: 0, 2, 3, and when f = 0, counts in the reverse direction. Use T flip-flops. (a) Construct a state diagram or state table. (b) Specify a state assignment.
Draw the phasor diagrams associated with under-excited and over-excited synchronous motors and show the power factor of operation associated with each.
noncausal, linear, and time-invariant. Determine the impulse response for the system and verify that an LTI system defined by the impulse response you determined satisfies the difference equation.
A µ-law compression encoder has: Vi(max) = 8 V, vi(max) = 1V, µ = 255 Determine the output voltage for an input voltage of 2 V
Given a 100MHz clock signal, derive a circuit using D flip-flops to generate 50HHz and 25MHz clock signals. Draw a timing diagram for all three clock signals, assuming reasonable delays.
a) Given that the refractive index of water is about 1.33, what is the polarization angle for light traveling in air and reflected from the surface of water b) Consider a diver in sea pointing a flashlight towards the surface of the water.
A voltage divider having a gain G = Vo/Vs = 0.8 consists of 5% resistors Ra and Rb having nominal values of 100 Ohms and 400 Ohms. A worst case analysis shows that Gmin
A 25KVA single phase transformer has 220 turns on the primary and 80 turns on the secondary. The primary is connected to 1500V, 50Hz supply. Calculate primary and secondary currents on full load secondary EMF and maximum flux in the core
The latest Lithium-ion batteries and double-layer ultra-capacitors have amazing energy-storage capacities. However, the voltage of a single cell is usually not sufficient for higher power applications, and series connection is then required.
Use a 74LS283N Adder chip and a 74LS86N XOR chip. Simulate the circuit in Multisim and test enough input combinations that you are sure the circuit is working properly. Make sure you test in all theranges of numbers that are possible.
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