When a comet passes near the Sun, part of it takes on the appearance of a large, bright ball from which the tail extends. This part is called the
A) coma.
B) nucleus.
C) plasma tail.
D) Oort core.
A) coma.
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Determine the maximum heating rate to the inner surface of the casting due to the release of heat of fusion in the molten iron.
Which of the following is an example of re?ection or scattering?
A) Red light hits a red sweatshirt. B) Visible light does not pass through a black wall. C) Blue light hits a red sweatshirt. D) Light comes from your computer screen.
In a dc motor, the polarity and current are reversed by a(n) ______________
Fill in the blank(s) with correct word
A magnifying glass produces an angular magnification of 7. What is the focal length of this lens if a person whose near point is 28 cm reads a book using this magnifying glass?
A) 2 cm B) 3 cm C) 4 cm D) 5 cm E) 6 cm