The Essential Cosmic Perspective (8th Edition)
The Essential Cosmic Perspective (8th Edition)
8th Edition
ISBN: 9780134446431
Author: Jeffrey O. Bennett, Megan O. Donahue, Nicholas Schneider, Mark Voit
Publisher: PEARSON
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Chapter 11, Problem 50EAP

(a)

To determine

The surface area of the giant sphere of radius 1AU around Sun in square meters

(b)

To determine

To determine/To Check:

Power in watts per square meter

(c)

To determine

Reasons as to why the average power per square meter that a solar collector collects on the ground will always be less than what found in part B

(d)

To determine

To determine/To Check:

Orientation of solar collector to optimize the amount of power collected

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A cylindrical rod 1.50 m long and 0.500 cm in diameter is connected to a power source that maintains a constant potential difference of 15.0 V between its ends, while an ammeter measures the current through it. It is observed that at room temperature (20.0 °C) the ammeter gives a reading of 18.5 A, while at 92.0 °C it gives a reading of 17.2 A. The thermal expansion of the rod can be ignored. Calculate: a) the resistivity and b) the temperature coefficient of resistivity at 20 °C for the rod material.
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