A charge of +3.0 ?C is distributed uniformly along the circumference of a circle with a radius of 20 cm. How much external energy is required to bring a charge of 25?C from infinity to the center of the circle?
a. 5.4 J
b. 3.4 J
c. 4.3 J
d. 2.7 J
e. 6.8 J
b
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In Einstein's General Theory of Relativity, higher dimensions beyond the three that we can comprehend are called
A) hidden space B) hyperspace C) excited space D) extra space
Aluminum (Group III) and silicon (Group IV) are adjacent to each other in the periodic table. Relative to aluminum silicon is less dense, has a higher melting temperature, is harder, and is very prevalent in the sand and rocks of the Earth’s crust. And yet aluminum has many more mechanical applications, such as in the structure and skin of aircraft, the cylinder heads in automobile engines, small boats, and marine engines. We will cover this later in the book, but from what you know about metals, such as aluminum, what property results in the use of aluminum in these applications rather than silicon?
What will be an ideal response?
The astrology practiced by those who cast predictive horoscopes can be tested by
A) comparing how often the predictions come true to what would be expected by pure chance. B) asking astrologers if it works. C) polling people to find out what percentage believe their horoscopes to be accurate. D) counting how many times the predictions come true.
For a system undergoing an isothermal process,
a. 
b. 
c. 
d. 
e. 