Discuss the evidence we have that the surface of Venus is marked by volcanism
What will be an ideal response?
Many features on Venus testify to its volcanic history. Radar maps reveal shield volcanoes and long lava channels. Other volcanic features include the coronae, circular bulges up to 2600 km (1600 mi) in diameter bordered by fractures, volcanoes, and lava flows. Coronae appear to be produced by rising convection currents of molten magma that push up under the crust. When the magma withdraws, the crust sinks back, but the circular fractures mark the edge of the corona.
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One kilogram of chilled water at 32°F (0°C) is placed in a freezer which is kept at 0°F (?18°C). Approximately how much electric energy (in kilocalories) is needed to operate the compressor to cool this water to 0°F if the room temperature is maintained at 75°F (24°C)? (Lice = 3.33 × 10^5 J/kg; cice = 2.09 × 10^3 J/kg/°C)
a. 13 b. 1.5 c. 15 d. 16 e. 33
Astronomers measured the location of the Sun in the Milky Way Galaxy by
A. counting the number of stars. B. plotting the position of O and B stars. C. plotting the position of globular star clusters. D. plotting distribution of water molecules.
A stone is thrown downward from a cliff. Take "up" to be the positive direction. Which of the following statements is true about the stone?
a. The velocity is negative, the acceleration is negative, and the speed is negative. b. The velocity is positive, the acceleration is negative, and the speed is positive. c. The velocity is negative, the acceleration is negative, and the speed is positive. d. The velocity is positive, the acceleration is positive, and the speed is positive.
A student uses a thermometer calibrated in Kelvin units. A temperature change of 20 K is equivalent to a change of how many degrees on the Celsius scale? ________.
Fill in the blank(s) with the appropriate word(s).