The process by which a rotating, convecting body of conducting matter, such as in Earth's core or in the Sun's convection zone, can generate a magnetic field is referred to as the _____
A) accordion effect
B) Dember effect
C) Allais effect
D) dynamo effect
D
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What will be an ideal response?
Two metal rods, one silver and the other copper, are both attached to a steam chamber as shown in the figure, with a temperature of 100°C, at one end, and an ice water bath, with a temperature of 0°C, at the other
The rods are 5.0 cm long and have a square cross-section, 2.0 cm on a side. When steady state has been reached, how much heat flows through the two rods in 1.0 min? The thermal conductivity of silver is 417 W/(m ? K), and that of copper is 395 W/(m ? K). No heat is exchanged between the rods and the surroundings, except at their ends. A) 20 kJ B) 39 kJ C) 47 kJ D) 49 kJ E) 11 kJ
It was the distribution of ________ that showed Harlow Shapley we were no where near the center of the Milky Way in the 1920s
A) planetary nebulae B) emission nebulae C) open clusters D) globular clusters E) supernova remnants
Which of the following is not a standard metric unit?
a. Kilogram b. Meter c. Second d. Gram