If the distance between us and a star is doubled, the apparent brightness is decreased by a factor of four
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TRUE
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Which of the following is the smallest unit of heat energy?
A) Btu B) calorie C) kilocalorie D) Joule
The length of time the shutter is open when the film is exposed in a camera is determined by the
A) shutter speed. B) f-stop. C) focal length of the lens.. D) focusing. E) diameter of the aperture.
Potential Energy: Two tiny particles having charges q1 = +56.0 nC and q2 = -46.0 nC are separated by 0.500 m and held in place, as shown in the figure. A third particle, having a charge of 54.0 nC is placed at the point A, which is 0.18 m to the left of q2. How much work is needed to move the third particle from point A to point B, which is 0.40 m to the left of q1. All the points in the figure lie on the same line. (k = 1/4??0 = 9.0 × 109 N ? m2/C2) 
Fill in the blank(s) with the appropriate word(s).
Titan's surface has been mapped using Earth based visual telescopes
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