A blacksmith drops a 550 °F piece of iron into a vat of 75 °F water in order to cool it to 100 °F. How many kilograms of water are needed per kilogram of iron? Assume all the thermal energy from the iron is transferred to the water and none of the water evaporates. The specific heats of water and iron are 4186 J/kg/°C and 448 J/kg/°C, respectively
a. 9.3 kg
b. 0.78 kg
c. 0.52 kg
d. 1.9 kg
d
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Equilibrium: A 120-kg refrigerator that is 2.0 m tall and 85 cm wide has its center of mass at its geometrical center. You are attempting to slide it along the floor by pushing horizontally on the side of the refrigerator. The coefficient of static friction between the floor and the refrigerator is 0.30. Depending on where you push, the refrigerator may start to tip over before it starts to slide along the floor. What is the highest distance above the floor that you can push the refrigerator so that it will not tip before it begins to slide?
A. 0.71 m B. 1.0 m C. 1.2 m D. 1.4 m E. 1.6 m
What is the crucial characteristic of an Einstein solid that makes it easier to analyze in the context of this chapter than most other kinds of thermodynamic systems?
A. The atoms are arranged in a regular, cubic lattice. B. The atoms are identical. C. Its microstates are comparatively easy to count. D. Each atom’s energy levels are equally spaced. E. ? (U, N) is always reasonably small. F. Other (specify).
What is the formation from intrusive to extrusive rock?
What will be an ideal response?
Why might the presence of a giant planet be both good and bad for life on a terrestrial planet in another solar system?
What will be an ideal response?