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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.
Measurements taken on various resistors are shown below. For each, calculate the power dissipated in the resistor and the power rating necessary for safe operation using standard components with power ratings of 1/8 W, 1/4 W, 1/2 W, 1 W, or 2 W
An electron describes periodic oscillations in the direction of the axis "z" with amplitude of 1 nm (nano meters) around a ring, if the ring has a total charge of 100e with a radius of 50 nm (nano meters) . Determine load osilacion and maximum spe..
(1) Explain what happens in a series circuit when the frequency makes Xc equal to XL. Does it have a name (2) What is the relationship between Ic and IL at Is minimum (3) Why is the source current, Is, minimum at certain frequency
1. Find the volume of a cylinder whose base is 9 inches in diameter and whose altitude is 12 inches. 2. Find the following values a. cos 77 degree 3'30" b. sin 18 degree 40' 3. In a right triangle ABC, if the leg a=8 and the leg b=5. what is the angl..
Design a sequencer with an enabler with 3 outputs that when enabled follows a successive clock sequence of 000,000,011,011,110,110,010,011 when the last step is reached the sequence returns to the beginning.
Given a parallel resonant circuit with the following components: a 10mA source with a zero degree phase angle in parallel with a 10k ohm source resistance, a parallel inductor of 80uH with an internal resistance of 1.5 ohms
g0 is the acceleration of gravity at the surface of the Earth, A is the altitude, and Re is the radius of the Earth, approximately 6,380 kilometers. What is the value of g at an altitude of 20 miles in unites of meters per second squared
The temperature decreases by 33.8 C°. Determine the fractional decrease L/(LSilver + LGold) in the rod's length, where LSilver and LGold are the initial lengths of the silver and gold rods.
Suppose that independent missiles A, B, C have probabilities .4, .5, and .6 of hitting the enemy's headquarters, respectively. Assume that the enemy's headquarters will be destroyed with a probability .3,
Why can't a video signal such as an NTSC analog television signal be transmitted over a two km length of loaded twisted pair cable with a frequency range 300 Hz to 3,400 Hz? What is the bandwidth occupied by an NTSC video signal?
You are working with a design team on a new product and are assigned to design the power supply. The requirements for the power supply are as follows: Input AC: 115 V AC +- 10%, 50-60 Hz Outputs: +5 V DC at 100 ma, +-12 V DC
A point charge of 16 nc is located at Q(2,3,5) in free space and a uniform line charge of 5nC/m is at the intersection of the planes x = 2 and y=4. If the potential at the origin is 100V, find V at (4,1,3).
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