A file extension includes a period (.) and a file format identifier.
Answer the following statement true (T) or false (F)
True
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Predict the concentration of ammonia in air 5 mm from an interface of vapor ammonia and air if the interface area is 1500 mm^2 and the evaporation rate is found to be 0.002 g/min. Assume the ammonia and air are at 20ºC.
What will be an ideal response?
In 1998, it was announced that the expansion of the universe is accelerating. What does this imply from the perspective of the big bang?
a. A force exists that we knew nothing about that causes the acceleration. b. The universe must be closed. c. The universe is finite. d. The amount of dark matter must be greatly less than the amount of normal matter. e. The universe must be infinitely old.
A camera lens having a 50-mm focal length is set to f/4.0. What is the minimum spacing of two objects located 12 m from the lens if the objects are just barely resolved in the image using light of wavelength 500 nm?
A) 4.9 × 10-5 m B) 0.024 mm C) 0.59 mm D) 4.72 mm E) 1.66 mm
A 1.0-kg chunk of ice at 0°C melts, absorbing 80,000 cal of heat in the process. Which of the following best describes what happens to this system?
a. increased entropy c. entropy maintained constant b. lost entropy d. work converted to energy