What is unusual about Triton?
A. It orbits its planet backward.
B. It does not keep the same face toward its planet.
C. It is the only moon with its own rings.
Ans: A. It orbits its planet backward.
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A room is heated with electric resistance wires embedded in the 2.2 m high ceiling. Estimate the heat transfer per unit of floor area when the ceiling is at 80ºC and the floor is 10ºC. Neglect any radiation and heat transfer between the walls of the room.
What will be an ideal response?
The book shows a photograph of a human face, taken at shorter and shorter camera exposure times. What is observed at the shortest exposure times, and what does this observation demonstrate about the nature of light?
A) We observe a very dim but complete image of the face, showing that light is made of waves that have smaller amplitude as the light is reduced. B) We observe light and dark lines due to interference, showing that light is a wave. C) Individual white dots are distributed all over the photographic plate, showing that light is made of waves. D) We observe individual white dots at the center of the photograph, showing that the camera tends to focus individual photons at this point. E) Individual white dots were distributed randomly over the photographic plate, showing that light interacts with the screen in tiny bundles.
Specific heat capacity of ice = 2,000 J/kg-°C latent heat of fusion of water = 334,000 J/kg specific heat capacity of water = 4,000 J/kg-°C As the ice is melting, the temperature of the ice-water mixture rises by
a. 0°C. b. +5°C. c. –5°C. d. +10°C. e. –10°C.
Diamond, graphite, and buckyballs are
a. isotopes. b. allotropes. c. isomeres. d. diatomic.