A heat engine absorbs 85.6 kJ of heat each cycle and exhausts 61.8 kJ
(a) What is the efficiency of the engine?
(b) How much work does it do each cycle?
(a) 27.8% (b) 23.8 kJ
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A(n) ____ is a collection of 105 to 106 stars in a region 10 to 30 pc in diameter. The stars in the collection tend to be more than 109 years old and mostly yellow and red stars
a. Herbig Haro object b. globular cluster c. open cluster d. giant cluster e. supernova
A mirage occurs when light travels faster
A) near the ground than higher up. B) in less dense air than more dense air higher up. C) both of these D) neither of these
A person having a near point of 25 cm uses a magnifying glass with a focal length of 10 cm. What is the angular magnification of the glass for that person when her eyes are focused at infinity?
A) 1.5 B) 2.5 C) 3.5 D) 4.5
A concave spherical mirror has a focal length of magnitude 20 cm. An object is placed 10 cm in front of the mirror on the mirror's axis. Where is the image located?
A) 20 cm behind the mirror B) 20 cm in front of the mirror C) 6.7 cm behind the mirror D) 6.7 cm in front of the mirror