Essential Environment: The Science Behind the Stories (6th Edition)
Essential Environment: The Science Behind the Stories (6th Edition)
6th Edition
ISBN: 9780134714882
Author: Jay H. Withgott, Matthew Laposata
Publisher: PEARSON
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Chapter 15, Problem 2TYC
To determine

To describe: The difference between the net energy and energy returned on investment (EROI) and the importance of these concept while evaluating the energy sources.

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Problems A.1 The square-law modulator is a device for the generation of DSB-PC-AM signals. In the square-law modulator, the sum of the modulating signal and the carrier wave forms the input signal to a nonlinear device. The output signal of the nonlinear device is a linear combination of the input signal and the square of the input signal. The output signal of the nonlinear device is then band-pass filtered. The BPF has a center frequency that is the same as the carrier frequency and a bandwidth that is twice the message bandwidth. Show the output of the BPF is a DSB-PC-AM signal, and determine a requirement between the carrier frequency and the message bandwidth that must be satisfied.
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In cell C21, enter a formula to calculate the number of miles you expect to drive each month. Divide the value of number of miles (cell A5 from the Data sheet) by the average MPG for the vehicle multiplied by the price of a gallon of gas (cell A6 from the Data sheet).
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