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On television, rotating objects such as wagon wheels and airplane propellers often appear to be moving very slowly or even backwards. This isa result of aliasing, caused by the sampling rate of the video (30 frames per second) being less than twice the frequency of the rotational motion. To understand this, imagine we paint one of the blades of an airplane propeller so that we can identify it from the other blades. We will then turn the propeller at 33 rotations per second, in a clockwise direction. In frame number 1 of our video sequence, the marked blade happens to be exactly at the top of the propeller.
a. How many rotations does the marked blade make between two successive frames?b. Draw a sketch of how the propeller would appear in frames 1, 2, 3 and 4.c. How many frames does it take for the marked blade to again appear at the top?d. What rotational frequency is (c) in rotations per second?e. Is this apparent rotation clockwise or counterclockwise?f. Explain using Fig. 3-4 how the marked blade's actual frequency, the frame rate, and the marked blade's observed frequency are related.g. Repeat (a) to (f) when the propeller is turning at 57 rotations per second.
(a) Compute the minimum voltage that the output voltage across R1 falls to when both capacitors C1 and C2 are present. (b) Using the same model for D1, compute the maximum voltage that the output voltage across R1 rises to.
Design your concept of a device and describe its operation in terms of the topics in the course (solid states course). For example, maybe you can make a new type of solar cell based on semiconducting liquids
Design a circuit that, given a 2-bit value, will light a LED corresponding to that value. One of four LEDs should be lit for each of the four possible input values (binary 0 through 3).
Estimate the mass transfer area per unit volume (a) for this column, estimate the Hoy value for this column and calculate Noy and estimate the height of the column using your answer for Hoy
We have four 3-H inductances. What is the maximum inductance that can be obtained by connecting all of the inductances in series and/or parallel What is the minimum inductance
A recording engineer works in a soundproofed room that is 36.5 dB quieter than the outside. If the sound intensity in the room is 1.34 x 10-10 W/m2, what is the intensity outside
Suppose you have a need for a D type flip-flop, but only have access to T type flip-flops. Implement a circuit equivalent to a D-type flip-flop with a t-type flip-flop and some extra logic gates.
A 5 KVA 480/120 V single phase transformer is to be used as an autotransformer to transform a 600 V source to a 480 V supply. As a single phase transformer delivering rated load at 0.8 PF Lag its efficiency.
Determine the transfer function for a first order HIGH filter with a cutoff frequency of 1000 radians per second and passband gain of 1 using Chebyshev type with 1-dB ripples on the passband.
1- A particular gas exerts a pressure of 2.79 bar. What is this pressure in units of pascals 2- A particular gas exerts a pressure of 3.43 bar. What is this pressure in units of atmospheres 3- A particular gas exerts a pressure of 4.79 atm.
A parallel-resonant RLC circuit has R = 75 I, L=50mh, and C=45pF. A) Sketch and label the circuit. B) Find fo, the resonant frequency. C) At what frequency is impedance a maximum D) What is the magnitude of the impedance at this frequency
What is dither in audio signal processing?
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