The thermal conductivity of a certain concrete is 0.80 W/m . K and the thermal conductivity of a certain wood is 0.10 W/m ? K
How thick would a solid concrete wall have to be in order to have the same rate of heat flow through it as an 8.0-cm thick wall made of solid wood? Both walls have the same surface area and the same temperature difference across their faces.
A) 53 cm B) 71 cm C) 85 cm D) 64 cm
D
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In an isochoric process, the internal energy of a system decreases by 50J. What is the work done?
A. zero B. +50 J C. -50 J D. none of the above
All of the following have occurred over long periods of time on Earth. Which one is not thought to have played a major role in long-term changes in Earth's climate?
A) a gradual rise in the atmospheric content of oxygen B) changes in the Earth's axis tilt C) changes in the Earth's overall reflectivity D) changes in the atmospheric concentration of greenhouse gases
At a depth of 1030 m in Lake Baikal (a fresh water lake in Siberia), the pressure has increased by 100 atmospheres (to about 107 N/m2)
By what volume has 1.0 m3 of water from the surface of the lake been compressed if it is forced down to this depth? The bulk modulus of water is 2.3 × 109 Pa. A) 5.3 × 10-3 m3 B) 4.3 × 10-3 m3 C) 2.3 × 10-3 m3 D) 3.3 × 10-3 m3
Hydrogen gas would be a product of the reaction of
a. vinegar and baking soda. b. iron and hydrochloric acid. c. oxygen and methane. d. HCl and NaOH.