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.

Physics & Space Science

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In a dc motor, the polarity and current are reversed by a(n) ______________

Fill in the blank(s) with correct word

Physics & Space Science

Determine the maximum heating rate to the inner surface of the casting due to the release of heat of fusion in the molten iron.

Physics & Space Science

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

Physics & Space Science

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.

Physics & Space Science