On a night when a human eye can see a fourth magnitude star, a 60mm telescope, with 100× the surface area as our pupil, would be able to just barely detect
A) ninth magnitude Barnard's Star.
B) eighth magnitude Uranus.
C) seventh magnitude Titan, Saturn's largest moon.
D) eleventh magnitude Tethys, Saturn's second largest moon.
E) thirteenth magnitude Pluto.
A
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Graphical Analysis: Which of the following graphs represent an object having zero acceleration?
A. only graph a B. only graph b C. graphs a and b D. graphs b and c E. graphs c and d
Kirchhoff's Rules: Kirchhoff's junction rule is a statement of
A. the law of conservation of momentum. B. the law of conservation of charge. C. the law of conservation of energy. D. the law of conservation of angular momentum. E. Newton's second law.
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Answer the following statement true (T) or false (F)
If a person in Alaska were locked out of his house on a day when the temperature outside was ?40°C, his thick clothing would mostly reduce the loss of thermal energy by
a. conduction. b. convection. c. radiation. d. all of the above. e. convection and radiation.