Some stars are cool enough to have molecules in their atmosphere
Indicate whether the statement is true or false
TRUE
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The look-back time of an object is directly related to its:
A) mass. B) distance. C) luminosity. D) size. E) composition.
The Moon's surface gravity is only half the Earth's
Indicate whether the statement is true or false
It is a well-known fact that water has a higher specific heat capacity than iron. Now, consider equal masses of water and iron that are initially in thermal equilibrium
The same amount of heat, 30 calories, is added to each. Which statement is true? A) They remain in thermal equilibrium. B) They are no longer in thermal equilibrium; the iron is warmer. C) They are no longer in thermal equilibrium; the water is warmer. D) It is impossible to say without knowing the exact mass involved. E) It is impossible to say without knowing the exact specific heat capacities.
Two metal rods, one silver and the other gold, are attached to each other
The free end of the silver rod is connected to a steam chamber, with a temperature of 100°C, and the free end of the gold rod to an ice water bath, with a temperature of 0°C. The rods are 5.0 cm long and have a square cross-section, 2.0 cm on a side. What is the temperature at the point where the two rods are in contact with one another? The thermal conductivity of silver is 417 W/(m•K) and that of gold is 291 W/(m•K) No heat is exchanged between the rods and the surroundings, except at the ends. A) 39°C B) 41°C C) 47°C D) 53°C E) 59°C