Vocabulary: Mastery Test N Select the correct answer. The suffix -cide comes from the Latin -cida, which means killer. -Cide follows the same naming rule as -vorous. Whi pesticide (killer of pests) would be the most effective weed killer? O A. Rodenticide B. Insecticide OC. Herbicide OD. Fungicide Reset Next

As part of an industrial process, air as an ideal gas at 10 bar, 400k expands at steady state through a valve to a pressure of 4 bar. the mass flow rate of air is 0.5 kg/s. the air then passes through a heat exchanger where it is cooled to a temperature of 295k with negligible change in pressure. the valve can be modeled as a throttling process, and kinetic and potential energy effects can be neglected. (a) for a control volume enclosing the valve and heat exchanger and enough of the local surroundings that the heat transfer occurs at the ambient temperature of 295 k, determine the rate of entropy production, in kw/k. (b) if the expansion valve were replaced by an adiabatic turbine operating isentropically, what would be the entropy production? compare the results of parts (a) and (b) and discuss.

When you push downward on a book at rest on a table, you feel an upward force. does this force depend on friction? defend your answer.

Imagine you are standing in the antarctic during the southern hemisphere summer. the sky is clear and blue. there are no clouds in the sky. your shadow is cast on the icy ground. what is the color of the shadow?