Spherical Mirrors: Tan's face is 20 cm in front of a concave shaving mirror. If he observes his image to be twice as big and upright, what is the focal length of the mirror?
A. 10 cm
B. -40 cm
C. -50 cm
D. 40 cm
E. 50 cm
Answer: D
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Heat Engines: A certain automobile engine takes in 4.00 kJ of heat and performs 1.10 kJ of mechanical work in each cycle.(a) Calculate the engine's efficiency.(b) How much heat is "wasted" in each cycle?
What will be an ideal response?
Which of the following statements does not use the term light-year in an appropriate way?
A) It's about 4 light-years from here to Alpha Centauri. B) It will take me light-years to complete this homework assignment. C) A light-year is about 10 trillion kilometers. D) It will take the Voyager spacecraft about 20,000 years to travel just 1 light-year. E) The Milky Way Galaxy is about 100,000 light-years in diameter.
Any object that is warmer than its surroundings will
A) absorb heat. B) emit radiation. C) reflect heat. D) become denser.
Werner Heisenberg's main contribution to the development of quantum theory was
A) the nonlocality principle. B) his explanation of the photoelectric effect, in terms of photons. C) a method for predicting the position at which electrons or other particles will strike the viewing screen in such experiments as the electron double-slit experiment. D) a method for predicting the overall statistical patterns that appear in the electron double-slit experiment and other experiments using microscopic particles. E) the uncertainty principle.